From 81f8cac691bacce5d762a8885ef51ac80d87b12a Mon Sep 17 00:00:00 2001 From: rtel Date: Sun, 25 Aug 2019 19:35:59 +0000 Subject: [PATCH] + Moved the History.txt file from the website git repo into the source code SVN repo. + Added xTaskCatchUpTicks() which corrects the tick count value after the application code has held interrupts disabled for an extended period. + Updated the xTaskResumeAll() implementation so it uses the new xTaskCatchUpTicks() function mentioned above to unwind ticks that were pended while the scheduler was suspended. + Various maintenance on the message buffer, stream buffer and abort delay demos. + Change type of uxPendedTicks from UBaseType_t to TickType_t to ensure it has same type as variables it is compared to, and therefore also rename the variable xPendingTicks. + Correct spelling mistake within a comment that was common to all the ARMv7-M ports. git-svn-id: https://svn.code.sf.net/p/freertos/code/trunk@2715 1d2547de-c912-0410-9cb9-b8ca96c0e9e2 --- FreeRTOS/Demo/Common/Minimal/AbortDelay.c | 2 +- .../Demo/Common/Minimal/MessageBufferDemo.c | 8 +- .../Demo/Common/Minimal/StreamBufferDemo.c | 42 +- FreeRTOS/History.txt | 2707 +++++++++++++++++ FreeRTOS/Source/include/mpu_prototypes.h | 3 +- FreeRTOS/Source/include/mpu_wrappers.h | 3 +- FreeRTOS/Source/include/task.h | 21 +- FreeRTOS/Source/portable/CCS/ARM_CM3/port.c | 2 +- FreeRTOS/Source/portable/CCS/ARM_CM4F/port.c | 2 +- FreeRTOS/Source/portable/GCC/ARM_CM3/port.c | 2 +- FreeRTOS/Source/portable/GCC/ARM_CM4F/port.c | 2 +- .../Source/portable/GCC/ARM_CM7/r0p1/port.c | 2 +- FreeRTOS/Source/portable/IAR/ARM_CM3/port.c | 2 +- FreeRTOS/Source/portable/IAR/ARM_CM4F/port.c | 2 +- .../Source/portable/IAR/ARM_CM7/r0p1/port.c | 2 +- .../Source/portable/MikroC/ARM_CM4F/port.c | 2 +- FreeRTOS/Source/portable/RVDS/ARM_CM3/port.c | 2 +- FreeRTOS/Source/portable/RVDS/ARM_CM4F/port.c | 2 +- .../Source/portable/RVDS/ARM_CM7/r0p1/port.c | 2 +- FreeRTOS/Source/tasks.c | 82 +- 20 files changed, 2834 insertions(+), 58 deletions(-) create mode 100644 FreeRTOS/History.txt diff --git a/FreeRTOS/Demo/Common/Minimal/AbortDelay.c b/FreeRTOS/Demo/Common/Minimal/AbortDelay.c index 27d41c757..fc4e36f4d 100644 --- a/FreeRTOS/Demo/Common/Minimal/AbortDelay.c +++ b/FreeRTOS/Demo/Common/Minimal/AbortDelay.c @@ -430,7 +430,7 @@ static void prvTestAbortingStreamBufferReceive( void ) { TickType_t xTimeAtStart; StreamBufferHandle_t xStreamBuffer; -EventBits_t xReturn; +size_t xReturn; const size_t xTriggerLevelBytes = ( size_t ) 1; uint8_t uxRxData; diff --git a/FreeRTOS/Demo/Common/Minimal/MessageBufferDemo.c b/FreeRTOS/Demo/Common/Minimal/MessageBufferDemo.c index d50f573a0..ef52b2fd1 100644 --- a/FreeRTOS/Demo/Common/Minimal/MessageBufferDemo.c +++ b/FreeRTOS/Demo/Common/Minimal/MessageBufferDemo.c @@ -57,7 +57,7 @@ priority tasks, and from high to low priority tasks. */ #define mbHIGHER_PRIORITY ( tskIDLE_PRIORITY + 1 ) /* Block times used when sending and receiving from the message buffers. */ -#define mbRX_TX_BLOCK_TIME pdMS_TO_TICKS( 125UL ) +#define mbRX_TX_BLOCK_TIME pdMS_TO_TICKS( 175UL ) /* A block time of 0 means "don't block". */ #define mbDONT_BLOCK ( 0 ) @@ -245,8 +245,8 @@ UBaseType_t uxOriginalPriority; xReturned = xMessageBufferSend( xMessageBuffer, ( void * ) pucData, sizeof( pucData[ 0 ] ), xBlockTime ); xTimeAfterCall = xTaskGetTickCount(); vTaskPrioritySet( NULL, uxOriginalPriority ); - configASSERT( ( xTimeAfterCall - xTimeBeforeCall ) >= xBlockTime ); - configASSERT( ( xTimeAfterCall - xTimeBeforeCall ) < ( xBlockTime + xAllowableMargin ) ); + configASSERT( ( ( TickType_t ) ( xTimeAfterCall - xTimeBeforeCall ) ) >= xBlockTime ); + configASSERT( ( ( TickType_t ) ( xTimeAfterCall - xTimeBeforeCall ) ) < ( xBlockTime + xAllowableMargin ) ); configASSERT( xReturned == 0 ); ( void ) xReturned; /* In case configASSERT() is not defined. */ ( void ) xTimeBeforeCall; @@ -758,7 +758,7 @@ const TickType_t xTicksToBlock = pdMS_TO_TICKS( 250UL ); /* Don't expect to receive anything yet! */ xTimeOnEntering = xTaskGetTickCount(); xReceivedLength = xMessageBufferReceive( xMessageBuffers.xEchoClientBuffer, ( void * ) pcReceivedString, mbMESSAGE_BUFFER_LENGTH_BYTES, xTicksToBlock ); - configASSERT( ( xTaskGetTickCount() - xTimeOnEntering ) >= xTicksToBlock ); + configASSERT( ( ( TickType_t ) ( xTaskGetTickCount() - xTimeOnEntering ) ) >= xTicksToBlock ); configASSERT( xReceivedLength == 0 ); ( void ) xTimeOnEntering; /* In case configASSERT() is not defined. */ diff --git a/FreeRTOS/Demo/Common/Minimal/StreamBufferDemo.c b/FreeRTOS/Demo/Common/Minimal/StreamBufferDemo.c index 0efddcd25..c5854bc62 100644 --- a/FreeRTOS/Demo/Common/Minimal/StreamBufferDemo.c +++ b/FreeRTOS/Demo/Common/Minimal/StreamBufferDemo.c @@ -283,8 +283,8 @@ UBaseType_t uxOriginalPriority; xReturned = xStreamBufferSend( xStreamBuffer, ( void * ) pucData, sizeof( pucData[ 0 ] ), xBlockTime ); xTimeAfterCall = xTaskGetTickCount(); vTaskPrioritySet( NULL, uxOriginalPriority ); - prvCheckExpectedState( ( xTimeAfterCall - xTimeBeforeCall ) >= xBlockTime ); - prvCheckExpectedState( ( xTimeAfterCall - xTimeBeforeCall ) < ( xBlockTime + xAllowableMargin ) ); + prvCheckExpectedState( ( ( TickType_t ) ( xTimeAfterCall - xTimeBeforeCall ) ) >= xBlockTime ); + prvCheckExpectedState( ( ( TickType_t ) ( xTimeAfterCall - xTimeBeforeCall ) ) < ( xBlockTime + xAllowableMargin ) ); prvCheckExpectedState( xReturned == 0 ); /* The buffer is now full of data in the form "000000", "111111", etc. Make @@ -331,8 +331,8 @@ UBaseType_t uxOriginalPriority; xReturned = xStreamBufferReceive( xStreamBuffer, ( void * ) pucReadData, x6ByteLength, xBlockTime ); xTimeAfterCall = xTaskGetTickCount(); vTaskPrioritySet( NULL, uxOriginalPriority ); - prvCheckExpectedState( ( xTimeAfterCall - xTimeBeforeCall ) >= xBlockTime ); - prvCheckExpectedState( ( xTimeAfterCall - xTimeBeforeCall ) < ( xBlockTime + xAllowableMargin ) ); + prvCheckExpectedState( ( ( TickType_t ) ( xTimeAfterCall - xTimeBeforeCall ) ) >= xBlockTime ); + prvCheckExpectedState( ( ( TickType_t ) ( xTimeAfterCall - xTimeBeforeCall ) ) < ( xBlockTime + xAllowableMargin ) ); prvCheckExpectedState( xReturned == 0 ); @@ -847,7 +847,7 @@ const TickType_t xTicksToBlock = pdMS_TO_TICKS( 350UL ); /* Don't expect to receive anything yet! */ xTimeOnEntering = xTaskGetTickCount(); xReceivedLength = xStreamBufferReceive( xStreamBuffers.xEchoClientBuffer, ( void * ) pcReceivedString, sbSTREAM_BUFFER_LENGTH_BYTES, xTicksToBlock ); - prvCheckExpectedState( ( xTaskGetTickCount() - xTimeOnEntering ) >= xTicksToBlock ); + prvCheckExpectedState( ( ( TickType_t ) ( xTaskGetTickCount() - xTimeOnEntering ) ) >= xTicksToBlock ); prvCheckExpectedState( xReceivedLength == 0 ); /* Now the stream buffers have been created the echo client task can be @@ -933,6 +933,7 @@ BaseType_t xErrorDetected = pdFALSE; { /* Create the stream buffer that will be used from inside the tick interrupt. */ + memset( ucRxData, 0x00, sizeof( ucRxData ) ); xStreamBuffer = xStreamBufferCreate( xStreamBufferSizeBytes, xTriggerLevel ); configASSERT( xStreamBuffer ); @@ -958,21 +959,34 @@ BaseType_t xErrorDetected = pdFALSE; /* Now check the number of bytes received equals the trigger level, except in the case that the read timed out before the trigger level was reached. */ - if( xBytesReceived < xTriggerLevel ) + if( xTriggerLevel > xReadBlockTime ) { - /* This should only happen if the trigger level was greater than - the block time. */ - if( xTriggerLevel < xReadBlockTime ) + /* Trigger level was greater than the block time so expect to + time out having received xReadBlockTime bytes. */ + if( ( xReadBlockTime - xBytesReceived ) > xAllowableMargin ) { xErrorDetected = pdTRUE; } } - else if( ( xBytesReceived - xTriggerLevel ) > xAllowableMargin ) + else if( xTriggerLevel < xReadBlockTime ) { - /* A margin may be required here if there are other high priority - tasks prevent the task that reads from the message buffer running - immediately. */ - xErrorDetected = pdTRUE; + /* Trigger level was less than the block time so we expect to + have received the trigger level number of bytes. */ + if( ( xTriggerLevel - xBytesReceived ) > xAllowableMargin ) + { + xErrorDetected = pdTRUE; + } + } + else + { + /* The trigger level equaled the block time, so expect to + receive no greater than the block time, but one or two less is + ok due to variations in how far through the time slice the + functions get executed. */ + if( xBytesReceived > xReadBlockTime ) + { + xErrorDetected = pdTRUE; + } } if( xBytesReceived > sizeof( ucRxData ) ) diff --git a/FreeRTOS/History.txt b/FreeRTOS/History.txt new file mode 100644 index 000000000..ba099724d --- /dev/null +++ b/FreeRTOS/History.txt @@ -0,0 +1,2707 @@ +Documentation and download available at http://www.FreeRTOS.org/ + +Changes since the last release: + + Added xTaskCatchUpTicks() which corrects the tick count value after the + application code has held interrupts disabled for an extended period. + + Updated the xTaskResumeAll() implementation so it uses the new + xTaskCatchUpTicks() function mentioned above to unwind ticks that were + pended while the scheduler was suspended. + + Update the Windows simulator port to use a synchronous object to prevent + a user reported error whereby a task continues to run for a short time + after being moved to the Blocked state. Note we were not able to + replicate the reported error. + + Added the vPortGetHeapStats() API function which returns information on + the heap_4 and heap_5 state. + + Change type of uxPendedTicks from UBaseType_t to TickType_t to ensure it + has same type as variables it is compared to, and therefore also rename + the variable xPendingTicks. + +Changes between FreeRTOS V10.2.1 and FreeRTOS V10.2.0 released May 13 2019: + + + Added ARM Cortex-M23 port layer to complement the pre-existing ARM + Cortex-M33 port layer. + + The RISC-V port now automatically switches between 32-bit and 64-bit + cores. + + Introduced the portMEMORY_BARRIER macro to prevent instruction re-ordering + when GCC link time optimisation is used. + + Introduced the portDONT_DISCARD macro to the ARMv8-M ports to try and + prevent the secure side builds from removing symbols required by the + non secure side build. + + Introduced the portARCH_NAME to provide additional data to select semi- + automated build environments. + + Cortex-M33 and Cortex-M23 ports now correctly disable the MPU before + updating the MPU registers. + + + Added Nuvoton NuMaker-PFM-M2351 ARM Cortex-M23 demo. + + Added LPC55S69 ARM Cortex-M33 demo. + + Added an STM32 dual core AMP stress test demo. + + +Changes between FreeRTOS V10.1.1 and FreeRTOS V10.2.0 released February 25 2019: + + + Added GCC RISC-V MCU port with three separate demo applications. + + Included pre-existing ARM Cortex-M33 (ARMv8-M) GCC/ARMclang and IAR ports + with Keil simulator demo. + + Update the method used to detect if a timer is active. Previously the + timer was deemed to be inactive if it was not referenced from a list. + However, when a timer is updated it is temporarily removed from, then + re-added to a list, so now the timer's active status is stored separately. + + Add vTimerSetReloadMode(), xTaskGetIdleRunTimeCounter(), and + xTaskGetApplicationTaskTagFromISR() API functions. + + Updated third party Xtensa port so it is MIT licensed. + + Added configINCLUDE_PLATFORM_H_INSTEAD_OF_IODEFINE_H to the Renesas + compiler RX600v2 port to enable switching between platform.h and + iodefine.h includes within that port's port.c file. + + Removed the 'FromISR' functions from the MPU ports as ISRs run privileged + anyway. + + Added uxTaskGetStackHighWaterMark2() function to enable the return type to + be changed without breaking backward compatibility. + uxTaskGetStackHighWaterMark() returns a UBaseType_t as always, + uxTaskGetStackHighWaterMark2() returns configSTACK_DEPTH_TYPE to allow the + user to determine the return type. + + Fixed issues in memory protected ports related to different combinations + of static memory only and dynamic memory only builds. As a result the + definition of tskSTATIC_AND_DYNAMIC_ALLOCATION_POSSIBLE became more + complex and was moved to FreeRTOS.h with a table explaining its definition. + + Added a 'get task tag from ISR' function. + + Change the method used to determine if a timer is active or not from just + seeing if it is referenced from the active timer list to storing its + active state explicitly. The change prevents the timer reporting that it + is inactive while it is being moved from one list to another. + + The pcName parameter passed into the task create functions can be NULL, + previously a name had to be provided. + + When using tickless idle, prvResetNextTaskUnblockTime() is now only called + in xTaskRemoveFromEventList() if the scheduler is not suspended. + + Introduced portHAS_STACK_OVERFLOW_CHECKING, which should be set to 1 for + FreeRTOS ports that run on architectures that have stack limit registers. + + +Changes between FreeRTOS V10.1.0 and FreeRTOS V10.1.1 released 7 September 2018 + + + Reverted a few structure name changes that broke several kernel aware + debugger plug-ins. + + Updated to the latest trace recorder code. + + Fixed some formatting in the FreeRTOS+TCP TCP/IP stack code. + + Reverted moving some variables from file to function scope as doing so + broke debug scenarios that require the static qualifier to be removed. + +Changes between FreeRTOS V10.0.1 and FreeRTOS V10.1.0 released 22 August 2018 + + FreeRTOS Kernel Changes: + + + Update lint checked MISRA compliance to use the latest MISRA standard, was + previously using the original MISRA standard. + + Updated all object handles (TaskHandle_t, QueueHandle_t, etc.) to be + unique types instead of void pointers, improving type safety. (this was + attempted some years back but had to be backed out due to bugs in some + debuggers). Note this required the pvContainer member of a ListItem_t + struct to be renamed - set configENABLE_BACKWARD_COMPATIBILITY to 1 if + this causes an issue. + + Added configUSE_POSIX_ERRNO to enable per task POSIX style errno + functionality in a more user friendly way - previously the generic thread + local storage feature was used for this purpose. + + Added Xtensa port and demo application for the XCC compiler. + + Changed the implementation of vPortEndScheduler() for the Win32 port to + simply call exit( 0 ). + + Bug fix in vPortEnableInterrupt() for the GCC Microblaze port to protect + the read modify write access to an internal Microblaze register. + + Fix minor niggles when the MPU is used with regards to prototype + differences, static struct size differences, etc. + + The usStackHighWaterMark member of the TaskStatus_t structure now has type + configSTACK_DEPTH_TYPE in place of uint16_t - that change should have been + made when the configSTACK_DEPTH_TYPE type (which gets around the previous + 16-bit limit on stack size specifications) was introduced. + + Added the xMessageBufferNextLengthBytes() API function and likewise stream + buffer equivalent. + + Introduce configMESSAGE_BUFFER_LENGTH_TYPE to allow the number of bytes + used to hold the length of a message in the message buffer to be reduced. + configMESSAGE_BUFFER_LENGTH_TYPE default to size_t, but if, for example, + messages can never be more than 255 bytes it could be set to uint8_t, + saving 3 bytes each time a message is written into the message buffer + (assuming sizeof( size_t ) is 4). + + Updated the StaticTimer_t structure to ensure it matches the size of the + Timer_t structure when the size of TaskFunction_t does not equal the size + of void *. + + Update various Xilinx demos to use 2018.1 version of the SDK tools. + + Various updates to demo tasks to maintain test coverage. + + FreeRTOS+UDP was removed in FreeRTOS V10.1.0 as it was replaced by + FreeRTOS+TCP, which was brought into the main download in FreeRTOS + V10.0.0. FreeRTOS+TCP can be configured as a UDP only stack, and + FreeRTOS+UDP does not contain the patches applied to FreeRTOS+TCP. + + FreeRTOS+TCP Changes: + + + Multiple security improvements and fixes in packet parsing routines, DNS + caching, and TCP sequence number and ID generation. + + Disable NBNS and LLMNR by default. + + Add TCP hang protection by default. + + We thank Ori Karliner of Zimperium zLabs Team for reporting these issues. + + +Changes between FreeRTOS V10.0.0 and FreeRTOS V10.0.1, released December 20 2017 + + + Fix position of "#if defined( __cplusplus )" in stream_buffer.h. + + Correct declarations of MPU_xQueuePeek() and MPU_xQueueSemaphoreTake() in + mpu_prototypes.h. + + Correct formatting in vTaskList() helper function when it prints the state + of the currently executing task. + + Introduce #error if stream_buffer.c is built without + configUSE_TASK_NOTIFICATIONS set to 1. + + Update FreeRTOS+TCP to V2.0.0 + - Improve the formatting of text that displays the available netword + interfaces when FreeRTOS+TCP is used on Windows with WinPCap. + - Introduce ipconfigSOCKET_HAS_USER_WAKE_CALLBACK option to enable a user + definable callback to execute when data arrives on a socket. + +Changes between FreeRTOS V9.0.1 and FreeRTOS V10.0.0: + + The FreeRTOS kernel is now MIT licensed: https://www.FreeRTOS.org/license + + New Features and components: + + + Stream Buffers - see http://www.FreeRTOS.org/RTOS-stream-buffer-example.html + + Message Buffers - see http://www.FreeRTOS.org//RTOS-message-buffer-example.html + + Move FreeRTOS+TCP into the main repository, along with the basic Win32 + TCP demo FreeRTOS_Plus_TCP_Minimal_Windows_Simulator. + + New ports or demos: + + + Added demo for TI SimpleLink CC3220 MCU. + + Added MPU and non MPU projects for Microchip CEC and MEC 17xx and 51xx + MCUs. + + Added CORTEX_MPU_Static_Simulator_Keil_GCC demo to test static allocation + in the MPU port. + + Fixes or enhancements: + + + Cortex-M ports push additional register prior to calling + vTaskSwitchContext to ensure 8-byte alignment is maintained. Only + important if a user defined tick hook function performs an operation that + requires 8-byte alignment. + + Optimisations to the implementation of the standard tickless idle mode on + Cortex-M devices. + + Improvements to the Win32 port including using higher priority threads. + + Ensure interrupt stack alignment on PIC32 ports. + + Updated GCC TriCore port to build with later compiler versions. + + Update mpu_wrappers.c to support static allocation. + + The uxNumberOfItems member of List_t is now volatile - solving an issue + when the IAR compiler was used with maximum optimization. + + Introduced configRECORD_STACK_HIGH_ADDRESS. When set to 1 the stack start + address is saved into each task's TCB (assuming stack grows down). + + Introduced configINCLUDE_FREERTOS_TASK_C_ADDITIONS_H to allow user defined + functionality, and user defined initialisation, to be added to FreeRTOS's + tasks.c source file. When configINCLUDE_FREERTOS_TASK_C_ADDITIONS_H is + set to 1 a user provided header file called freertos_task_c_additions.h + will be included at the bottom of tasks.c. Functions defined in that + header file can call freertos_tasks_c_additions_init(), which in turn + calls a macro called FREERTOS_TASKS_C_ADDITIONS_INIT(), if it is defined. + FREERTOS_TASKS_C_ADDITIONS_INIT() can be defined in FreeRTOSConfig.h. + + Introduced configPRE_SUPPRESS_TICKS_AND_SLEEP_PROCESSING( x ) which can be + defined by a user in FreeRTOSConfig.h. The macro is called before + assessing whether to enter tickless idle mode or not. If the macro sets + x to zero then tickless idle mode will not be entered. This allows users + to abort tickless idle mode entry before the tickless idle function is + even called - previously it was only possible to abort from within the + tickless idle function itself. + + Added configPRINTF(), which can be defined by users to allow all libraries + to use the same print formatter. + + Introduced configMAX() and configMIN() macros which default to standard + max( x, y ) and min( x, y ) macro behaviour, but can be overridden if the + application writer defines the same macros in FreeRTOSConfig.h. + + Corrected the definition of StaticTask_t in the case where + INCLUDE_xTaskAbortDelay is set to 1. + + Introduced configTIMER_SERVICE_TASK_NAME and configIDLE_TASK_NAME, both of + which can be defined to strings in FreeRTOSConfig.h to change the default + names of the timer service and idle tasks respectively. + + Only fill the stack of a newly created task with a known value if stack + checking, or high water mark checking/viewing, is in use - removing the + dependency on memset() in other cases. + + Introduced xTaskCreateRestrictedStatic() so static allocation can be used + with the MPU. + + Ensure suspended tasks cannot be unsuspended by a received task + notification. + + Fix race condition in vTaskSetTimeOutState(). + + Updated trace recorder files to the latest version. + +Changes since FreeRTOS V9.0.0: + + + Priority dis-inheritance behaviour has been enhanced in the case where a + task that attempted to take a mutex that was held by a lower priority task + timed out before it was able to obtain the mutex (causing the task that + holds the mutex to have its priority raised, then lowered again, in + accordance with the priority inheritance protocol). + + Split the overloaded xQueueGenericReceive() function into three separate + dedicated functions. + + Allow the default human readable text names given to the Idle and Timer + tasks to be overridden by defining the configIDLE_TASK_NAME and + configTIMER_SERVICE_TASK_NAME definitions respectively in FreeRTOSConfig.h. + + Introduced configINITIAL_TICK_COUNT to allow the tick count to take a + value of than than 0 when the system boots. This can be useful for + testing purposes - although setting configUSE_16_BIT_TICKS to 1 can also + be used to test frequent tick overflows. + + Ensure the Cortex-M SysTick count is cleared to zero before starting the + first task. + + Add configASSERT() into ARM Cortex-M ports to check the number of priority + bit settings. + + Clear the 'control' register before starting ARM Cortex-M4F ports in case + the FPU is used before the scheduler is started. This just saves a few + bytes on the main stack as it prevents space being left for a later save + of FPU registers. + + Added xSemaphoreGetMutexHolderFromISR(). + + Corrected use of portNVIC_PENDSVSET to portNVIC_PENDSVSET_BIT in MPU ports. + + Introduced configSTACK_DEPTH_TYPE to allow users to change the type used + to specify the stack size when using xTaskCreate(). For historic reasons, + when FreeRTOS was only used on small MCUs, the type was set to uint16_t, + but that can be too restrictive when FreeRTOS is used on larger + processors. configSTACK_DEPTH_TYPE defaults to uint16_t. + xTaskCreateStatic(), being a newer function, used a uint32_t. + + Increase the priority of the Windows threads used by the Win32 port. As + all the threads run on the same core, and the threads run with very high + priority, there is a risk that the host will become unresponsive, so also + prevent the Windows port executing on single core hosts. + +Changes between FreeRTOS V9.0.0 and FreeRTOS V9.0.0rc2 released May 25 2016: + + See http://www.FreeRTOS.org/FreeRTOS-V9.html + + RTOS kernel updates: + + + The prototype of the new xTaskCreateStatic() API function was modified to + remove a parameter and improve compatibility with other new + "CreateStatic()" API functions. The stack size parameter in + xTaskCreateStatic() is now uint32_t, which changes the prototype of the + callback functions. See the following URL: + http://www.freertos.org/xTaskCreateStatic.html + + GCC ARM Cortex-A port: Introduced the configUSE_TASK_FPU_SUPPORT + constant. When configUSE_TASK_FPU_SUPPORT is set to 2 every task is + automatically given a floating point (FPU) context. + + GCC ARM Cortex-A port: It is now possible to automatically save and + restore all floating point (FPU) registers on entry to each potentially + nested interrupt by defining vApplicationFPUSafeIRQHandler() instead of + vApplicationIRQHandler(). + + All ARM Cortex-M3/4F/7 ports: Clear the least significant bit of the task + entry address placed onto the stack of a task when the task is created for + strict compliance with the ARM Cortex-M3/4/7 architecture documentation + (no noticeable effect unless using the QMEU emulator). + + Added GCC and Keil ARM Cortex-M4F MPU ports - previously the MPU was only + supported on ARM Cortex-M3. + + ARM Cortex-M3/4F MPU ports: Update to fully support the FreeRTOS V9.0.0 + API (other than static object creation) and added the + FreeRTOS/Demo/CORTEX_MPU_Simulator_Keil_GCC demo application to + demonstrate how to use the updated MPU port. + + All ARM Cortex-M3/4F/7 ports: Add additional barrier instructions to the + default low power tickless implementation. + + All ARM Cortex-M0 ports: Prevent an item being left on the stack of the + first task that executes. + + Win32 ports: Reduce the amount of stack used and change the way Windows + threads are deleted to increase the maximum execution time. + + Add an ARM Cortex-M4F port for the MikroC compiler. Ensure to read the + documentation page for this port before use. + + MPS430X IAR port: Update to be compatible with the latest EW430 tools + release. + + IAR32 GCC port: Correct vPortExitCritical() when + configMAX_API_CALL_INTERRUPT_PRIORITY == portMAX_PRIORITY. + + For consistency vTaskGetTaskInfo() now has the alias vTaskGetInfo(), + xTaskGetTaskHandle() now has the alias xTaskGetHandle() and + pcQueueGetQueueName() now has an alias pcQueueGetName(). + + Fix various errors in comments and compiler warnings. + + Demo application updates: + + + Update Atmel Studio projects to use Atmel Studio 7. + + Update Xilinx SDK projects to use the 2016.1 version of the SDK. + + Remove dependency on legacy IO libraries from the PIC32 demos. + + Move the Xilinx UltraScale Cortex-R5 demo into the main distribution. + + Update the MSP432 libraries to the latest version. + + Add Microchip CEC1302 (ARM Cortex-M4F) demos for GCC, Keil and MikroC + compilers. + + Move the Atmel SAMA5D2 demo into the main distribution. + +Changes between FreeRTOS V9.0.0rc1 and FreeRTOS V9.0.0rc2 (release candidate 2) +released March 30 2016: + + NOTE - See http://www.FreeRTOS.org/FreeRTOS-V9.html for details + + + The functions that create RTOS objects using static memory allocation have + been simplified and will not revert to using dynamic allocation if a + buffer is passed into a function as NULL. + + Introduced the configSUPPORT_DYNAMIC_ALLOCATION configuration constant to + allow a FreeRTOS application to be built without a heap even being being + defined. The Win32 example located in the + /FreeRTOS/demo/WIN32-MSVC-Static-Allocation-Only directory is provided as + a reference for projects that do not include a FreeRTOS heap. + + Minor run-time optimisations. + + Two new low power tickless implementations that target Silicon Labs EFM32 + microcontrollers. + + Addition of the xTimerGetPeriod() and xTimerGetExpireTime() API functions. + +Changes between FreeRTOS V8.2.3 and FreeRTOS V9.0.0rc1 (release candidate 1) +released February 19 2016: + + RTOS Kernel Updates: + + + Major new feature - tasks, semaphores, queues, timers and event groups can + now be created using statically allocated memory, so without any calls to + pvPortMalloc(). + + Major new features - Added the xTaskAbortDelay() API function which allows + one task to force another task to immediately leave the Blocked state, + even if the event the blocked task is waiting for has not occurred, or the + blocked task's timeout has not expired. + + Updates necessary to allow FreeRTOS to run on 64-bit architectures. + + Added vApplicationDaemonTaskStartupHook() which executes when the RTOS + daemon task (which used to be called the timer service task) starts + running. This is useful if the application includes initialisation code + that would benefit from executing after the scheduler has been started. + + Added the xTaskGetTaskHandle() API function, which obtains a task handle + from the task's name. xTaskGetTaskHandle() uses multiple string compare + operations, so it is recommended that it is called only once per task. + The handle returned by xTaskGetTaskHandle() can then be stored locally for + later re-use. + + Added the pcQueueGetQueueName() API function, which obtains the name of + a queue from the queue's handle. + + Tickless idling (for low power applications) can now also be used when + configUSE_PREEMPTION is 0. + + If one task deletes another task, then the stack and TCB of the deleted + task is now freed immediately. If a task deletes itself, then the stack + and TCB of the deleted task are freed by the Idle task as before. + + If a task notification is used to unblock a task from an ISR, but the + xHigherPriorityTaskWoken parameter is not used, then pend a context switch + that will then occur during the next tick interrupt. + + Heap_1.c and Heap_2.c now use the configAPPLICATION_ALLOCATED_HEAP + settings, which previously was only used by heap_4.c. + configAPPLICATION_ALLOCATED_HEAP allows the application writer to declare + the array that will be used as the FreeRTOS heap, and in-so-doing, place + the heap at a specific memory location. + + TaskStatus_t structures are used to obtain details of a task. + TaskStatus_t now includes the bae address of the task's stack. + + Added the vTaskGetTaskInfo() API function, which returns a TaskStatus_t + structure that contains information about a single task. Previously this + information could only be obtained for all the tasks at once, as an array + of TaskStatus_t structures. + + Added the uxSemaphoreGetCount() API function. + + Replicate previous Cortex-M4F and Cortex-M7 optimisations in some + Cortex-M3 port layers. + + Demo Application Updates: + + Further demo applications will be added prior to the final FreeRTOS V9 + release. + + + Updated SAM4L Atmel Studio project to use Atmel Studio 7. + + Added ARM Cortex-A53 64-bit port. + + Added a port and demo for the ARM Cortex-A53 64-bit cores on the Xilinx + Ultrascale MPSoC. + + Added Cortex-M7 SAME70 GCC demo. + + Added EFM32 Giant and Wonder Gecko demos. + + +Changes between V8.2.2 and V8.2.3 released October 16, 2015 + + RTOS kernel updates: + + + Fix bug identified in a modification made in V8.2.2 to the software timer + code that allows tickless low power applications to sleep indefinitely + when software timers are used. + + Simplify and improve efficiency of stack overflow checking. + + Add xTaskNotifyStateClear() API function. + + New IAR and GCC Cortex-R ports for microprocessors that do not use an ARM + generic interrupt controller (GIC). + + New PIC32MEC14xx port. + + Add support for PIC32MZ EF parts (with floating point) into the PIC32MZ + port. + + Zynq7000 port layer now declares the functions that setup and clear the + tick interrupt as weak symbols so they can be overridden by the + application, and uses a global XScuGic object so the same object can be + used by the application code. + + Introduced configUSE_TASK_FPU_SUPPORT, although the PIC32MZ EF port is + currently the only port that uses it. + + Updates to RL78 and 78K0 IAR port layers to improve support for + combinations of memory models. + + Minor updates to heap_5.c to remove compiler warnings generated by some + compilers. + + License simplifications. See /FreeRTOS/License/license.txt in the + official distribution. + + FreeRTOS+ updates: + + + Update directory names to use WolfSSL instead of CyaSSL, inline with + WolfSSL's re-branding. + + Update to latest WolfSSL code. + + Update to latest FreeRTOS+Trace recorder code. + + Add in the FreeRTOS+Trace recorder library required for streaming trace. + + Demo application changes: + + + Add demo applications for Renesas RZ/T (Cortex-R), PIC32MZ EF (PIC32 with + floating point hardware), PIC32MEC14xx, RX71M, RX113 and RX231. + + General tidy up of spelling and compiler warnings. + + +Changes between V8.2.1 and V8.2.2 released August 12, 2015 + + RTOS kernel updates: + + + Added Intel IA32/x86 32-bit port. + + General maintenance. + + PRIVILEGED_FUNCTION and PRIVILEGED_DATA macros, which are used in memory + protected systems, have been added to the newer event group and software + timer functions. + + Add the errno definitions used by FreeRTOS+ components into projdefs.h. + + Remove the restriction that prevented tick-less idle implementations + waiting indefinitely when software timers were used in the same + application. + + Introduce xTaskNotifyAndQueryFromISR() as the interrupt safe version of + xTaskNotifyAndQuery(). + + Add additional NOPs to the MSP430X port layers to ensure strict compliance + with the hardware documentation. + + Microblaze port: Added option for port optimised task selection. + + Microblaze port: Previously tasks inherited the exception enable state + at the time the task was created. Now all tasks are created with + exceptions enabled if the Microblaze design supports exceptions. + + Windows port: Add additional safe guards to ensure the correct start up + sequence and thread switching timing. + + Windows port: Improve the implementation of the port optimised task + selection assembly code. + + Update heap_4 and heap_5 to allow use on 64-bit processors. + + Simplify the code that creates a queue. + + General improved tick-less idle behaviour. + + Ensure none of the variables in the common kernel files are initialised to + anything other than zero. + + Correct calculation of xHeapStructSize in heap_4 and heap_5. + + Demo application updates: + + + Added demo project for the new IA32/x86 port that targets the Galileo + hardware. + + Added MSP430FR5969 demos (previously provided as a separate download). + + Added FreeRTOS BSP repository for automatic creation of FreeRTOS + applications in the Xilinx SDK. + + Added Atmel Studio / GCC project for the SAMV71 (ARM Cortex-M7) + + Update Xilinx SDK projects to use version 2015.2 of the SDK. + + Remove Microblaze demos that were using obsolete tools. + + Add MSP43FR5969 IAR and CCS demos. + + FreeRTOS+ Updates: + + + Updated FreeRTOS+Trace recorder library, which requires an update to the + FreeRTOS+Trace application. + + Added Reliance Edge source code and demo application. Reliance edge is + a fail safe transactional file system ideal for applications that require + file storage, and especially when high reliability is essential. + + Introduce configAPPLICATION_PROVIDES_cOutputBuffer to allow FreeRTOS+CLI + users to place the output buffer at a fixed memory address. + + Improve the NetworkInterface.c file provided for the Windows port of + FreeRTOS+UDP. + +Changes between V8.2.0 and V8.2.1 released 24th March 2015. + + RTOS kernel updates: + + + Added user definable and flexible thread local storage facility. + + Added vTimerSetTimerID() API function to complement the pvTimerGetTimerID() + function to allow the timer's ID to be used as timer local storage. + + Fixed a potential issue related to the use of queue sets from an ISR. + + Some updates to the Xilinx Microblaze GCC port. + + Added ARM Cortex-M4F port for Texas Instruments Code Composer Studio. + + Added ARM Cortex-M7 r0p1 port layer for IAR, GCC and Keil which contains a + minor errata work around. All other ARM Cortex-M7 core revisions should + use the ARM Cortex-M4F port. + + Exclude the whole of croutine.c if configUSE_CO_ROUTINES is set to 0. + + Change some data types from uint32_t to size_t in preparation for 64-bit + Windows port. + + Update the PIC32 port to remove deprecation warnings output by the latest + XC32 compilers. + + Demo application updates: + + + Added demo application for TI's ARM Cortex-M4F based MSP432 + microcontroller using IAR, Keil and CCS compilers. + + Added demo application for STM32F ARM Cortex-M7 based microcontroller + using IAR and Keil. + + Added demo application for Atmel SAMV71 ARM Cortex-M7 based + microcontroller using IAR and Keil. + + Added Microblaze demo that uses the 2014.4 version of the Xilinx SDK and + runs on the KC705 evaluation board (Kintex FPGA). + +Changes between V8.1.2 and V8.2.0 released 16th January 2015 + + Changes between release candidate 1 and the official release are restricted + to maintenance only. + + Significant RTOS kernel updates: + + + MAJOR NEW FEATURE! Task notifications. Please see the following URL for + details: http://www.FreeRTOS.org/RTOS-task-notifications.html + + NEW HEADER FILE REQUIRED! Obsolete definitions have been separated into + a new header file called FreeRTOS/Source/include/deprecated_definitions.h. + This header file must be present to build. Note some of the obsolete + definitions are still used by very old demo application projects. + + Other RTOS kernel updates: + + + Made xSemaphoreGiveFromISR() a function rather than a macro that calls + xQueueGenericSendFromISR(). This allows for major performance + enhancements at the expense of some additional code size if both functions + are used in the same application. NOTE: In most uses cases such use of + a semaphore can now be replaced with a task notification which is smaller + and faster still. + + The TCB is now always allocated such that the task's stack grows away from + the TCB (improves debugging of stack overflows as the overflow will not + overwrite the task's name). + + GCC, IAR and Keil Cortex-M4F ports now use more inlining (performance + enhancements at the cost of a little additional code space). + + Queues are now allocated with a single call to pvPortMalloc() which + allocates both the queue structure and the queue storage area. + + Introduced a new critical section macro for reading the tick count that + defines away to nothing in cases where the width of the tick allows the + tick count to be read atomically (performance benefits - especially when + optimisation is on). + + Introduced configAPPLICATION_ALLOCATED_HEAP in heap_4.c to allow the + application writer to provide their own heap array - and in so doing + control the location of the heap. + + Introduced configUSE_LIST_DATA_INTEGRITY_CHECK_BYTES which, when set, will + include known values in both list and list item structures. The values + are intended to assist debugging. If the values get overwritten then it + is likely application code has written over RAM used by the kernel. + + configASSERT()s in all Cortex-M ports used to test the lowest 5 bits of + the interrupt control register to detect taskENTER_CRITICAL() being called + from an interrupt. This has been changed to test all 8 bits. + + Introduced uxTaskPriorityGetFromISR(). + + Microblze V8 port now tests XPAR_MICROBLAZE_0_USE_FPU for inequality to 0 + rather than equality to 1, and 2 and 3 are also valid values. + + Cortex-A5 GIC-less port no longer passes the address of the interrupting + peripheral into the interrupt handler. + + Fix an issue in FreeRTOS-MPU where an attempt was made to free the stack + belonging to a task when the task was deleted, even when the stack was + allocated statically. + + Utility (helper) functions that format task statistic information into + human readable tables now pad task names with spaces to ensure columns + line up correctly even where task name lengths vary greatly. + + Update FreeRTOS+Trace recorder library to version 2.7.0. + + Demo application updates: + + + Added two new standard demo task sets: IntSemTest and TaskNotify. + + Added port and demo application for Atmel SAMA5D4 Cortex-A5 MPU. + + Added demo application for Altera Cyclone V Cortex-A9 MPU. + + Updated Zynq demo to use version 2014.4 of Xilinx's SDK and added in + demo tasks for new RTOS features. + + Updated Atmel SAM4E and SAM4S demos to include a lot of additional test + and demo tasks. + + Fixed a corner case issue in Atmel SAM4L low power tickless + implementation, and added button interrupt handling. + + Make the interrupt queue tests more tolerant to heave CPU loads. + + Updated MSVC FreeRTOS simulator demo to include the latest standard test + and demo tasks. + + Updated MingW/Eclipse FreeRTOS simulator demo to match the FreeRTOS MSVC + simulator demo. + + Updated all demos that use FreeRTOS+Trace to work with the latest trace + recorder code. + + +Changes between V8.1.1 and V8.1.2 released September 2nd 2014 + + Move the defaulting of configUSE_PORT_OPTIMISED_TASK_SELECTION into the + individual port layers where necessary so it does not affect ports that do + not support the definition. + +Changes between V8.1.0 and V8.1.1 released August 29th 2014 + + By popular requests - a minor patch to V8.1.0 to re-instate the ability to + give a mutex type semaphore (with priority inheritance) from an interrupt + handler. + +Changes between V8.0.1 and V8.1.0 released August 26th 2014 + + FreeRTOS scheduler, kernel, demo and test updates: + + + Improved the priority inheritance algorithms to assist integration with + off the shelf middleware that may hold multiple mutexes simultaneously. + + Introduce heap_5.c, which is similar to heap_4.c but allows the heap to + span multiple non-contiguous memory regions. + + Updated all Cortex-A9 ports to help trap a couple of common usage errors - + the first being when a task incorrectly attempts to exit its implementing + function and the second being when a non interrupt safe API function is + called from an interrupt. + + Update all Cortex-A9 ports to remove obsolete mode switches prior to + restoring a task context. + + configUSE_PORT_OPTIMISED_TASK_SELECTION now defaults to 1 instead of 0. + + Update all Cortex-M3/4F ports to trap a non interrupt safe API function + being called from an interrupt handler. + + Simplify the alignment checks in heap_4.c. + + Update the MSVC Windows simulator demo to use heap_5.c in place of + heap_4.c to ensure end users have an example to refer to. + + Updated standard demo test code to test the new priority inheritance + algorithms. + + Updated the standard demo tasks to make use of stdint and the FreeRTOS + specific typedefs that were introduced in FreeRTOS V8.0.0. + + Introduce the pdMS_TO_TICKS() macro as a more user friendly and intuitive + alternative to pdTICKS_PER_MS - both of which can be used to convert a + time specified in milliseconds to a time specified in RTOS ticks. + + Fix a bug in the Tasking compiler's Cortex-M port that resulted in an + incorrect value being written to the basepri register. This only effects + users of the Tasking compiler. + + Update the Zynq demo to use version 2014.2 of the SDK and add in an lwIP + example that demonstrates lwIP being used with both its raw and sockets + interfaces. + + Updated the CCS Cortex-R4 port to enable it to be built with the latest + CCS compiler. + + New ports and demo applications: + + + Two Renesas RX64M ports (RXv2 core) and demos introduced, one for the GCC + compiler and one for the Renesas compiler. Both demos use e2 studio. + + Generic IAR Cortex-A5 port (without any reliance on a GIC) introduced. + The new port is demonstrated on an Atmel SAMA5D3 XPlained board. + + FreeRTOS+ component updates: + + + Update CyaSSL to the latest version. + + Updated the FreeRTOS+ components supplied directly by Real Time Engineers + Ltd. to make use of stdint and the FreeRTOS specific typedefs that were + introduced in FreeRTOS V8.0.0. + + Rework and simplify the FreeRTOS+FAT SL RAM disk driver. + + Miscellaneous updates and maintenance: + + + Update the IAR and DS-5/ARM RZ demos to target the official RZ RSK + hardware in place of the previously targeted Renesas internal (not + publicly available) hardware. + + Various other maintenance tasks. + + +Changes between V8.0.0 and V8.0.1 released 2nd May 2014 + + + Minor fixes to the event group functionality that was released in V8.0.0. + The 'clear bits from ISR' functionality is now implemented using a + deferred interrupt callback instead of a function, and the 'wait bits' and + 'task sync' functions now correctly clear internal control bits before + returning a value in every possible path through the respective functions. + + Ensure the updating of internal control data is protected by a critical + section after a task is deleted or suspended. + + Minor fixes to FreeRTOS+FAT SL - namely seeking beyond the end of a file + when the offset was not a multiple of the sector size. + + Ensure Cortex-A9 system registers are only ever accessed as 32-bit values, + even when only the lest significant byte of the register is implemented. + + Other updates: + + + Updated the XMC4200 IAR project so it links with version 7.x of the IAR + tools. + + Add RL78L1C demo. + + Add pcTimerGetName() API function. + + Call _reclaim_reent() when a task is deleted if configUSE_NEWLIB_REENTRANT + is defined. + +Changes between V7.6.0 and V8.0.0 released 19th Feb 2014 + + http://www.freertos.org/upgrading-to-FreeRTOS-V8.html + + FreeRTOS V8.x.x is a drop-in compatible replacement for FreeRTOS V7.x.x, + although a change to the type used to reference character strings may result + in application code generating a few (easily clearable) compiler warnings + after the upgrade, and an updated typedef naming convention means use of the + old typedef names is now discouraged. + See http://www.freertos.org/upgrading-to-FreeRTOS-V8.html for full + information. + + New features and functionality: + + + Event groups - see http://www.freertos.org/FreeRTOS-Event-Groups.html + + Centralised deferred interrupt processing - see + http://www.freertos.org/xTimerPendFunctionCallFromISR.html + + Other updates: + + + Previously, when a task left the Blocked state, a context switch was + performed if the priority of the unblocked task was greater than or equal + to the priority of the Running task. Now a context switch is only + performed if the priority of the unblocked task is greater than the + priority of the Running task. + + New low power tickless demonstration project that targets the ST STM32L + microcontroller - see + http://www.freertos.org/STM32L-discovery-low-power-tickless-RTOS-demo.html + + Add xPortGetMinimumEverFreeHeapSize() to heap_4.c. + + Small change to the tickless low power implementation on the SAM4L to + ensure the alarm value (compare match value) cannot be set to zero when a + tickless period is exited due to an interrupt originating from a source + other than the RTOS tick. + + Update the GCC/Eclipse Win32 simulator demo to make better use of Eclipse + resource filters and match the functionality of the MSVC equivalent. + + xTaskIsTaskSuspended() is no longer a public function. Use + eTaskGetState() in its place. + + Improved trace macros, including tracing of heap usage. + + Remove one level of indirection when accepting interrupts on the PIC32MZ. + + Add Cortex-A9 GCC port layer. + + Add Xilinx Zynq demo application. + + +Changes between V7.5.3 and V7.6.0 released 18th November 2013 + + V7.6.0 changes some behaviour when the co-operative scheduler is used (when + configUSE_PREEMPTION is set to 0). It is important to note that the + behaviour of the pre-emptive scheduler is unchanged - the following + description only applies when configUSE_PREEMPTION is set to 0: + + WHEN configUSE_PREEMPTION IS SET TO 0 (which is in a small minority of + cases) a context switch will now only occur when a task places itself into + the Blocked state, or explicitly calls taskYIELD(). This differs from + previous versions, where a context switch would also occur when implicitly + moving a higher priority task out of the Blocked state. For example, + previously, WHEN PREEMPTION WAS TURNED OFF, if task A unblocks task B by + writing to a queue, then the scheduler would switch to the higher priority + task. Now, WHEN PREEMPTION IS TURNED OFF, if task A unblocks task B by + writing to a queue, task B will not start running until task A enters the + Blocked state or task A calls taskYIELD(). [If configUSE_PREEMPTION is not + set to 0, so the normal pre-emptive scheduler is being used, then task B + will start running immediately that it is moved out of the Blocked state]. + + Other changes: + + + Added a port layer and a demo project for the new PIC32MZ architecture. + + Update the PIC32MX port layer to re-introduce some ehb instructions that + were previously removed, add the ability to catch interrupt stack + overflows (previously only task stack overflows were trapped), and also + add the ability to catch an application task incorrectly attempting to + return from its implementing function. + + Make dramatic improvements to the performance of the Win32 simulator port + layer. + + Ensure tasks that are blocked indefinitely report their state as Blocked + instead of Suspended. + + Slight improvement to the Cortex-M4F port layers where previously one + register was inadvertently being saved twice. + + Introduce the xSemaphoreCreateBinary() API function to ensure consistency + in the semantics of how each semaphore type is created. It is no longer + recommended to use vSemaphoreCreateBinary() (the version prefixed with a + 'v'), although it will remain in the code for backward compatibility. + + Update the Cortex-M0 port layers to allow the scheduler to be started + without using the SVC handler. + + Added a build configuration to the PIC32MX MPLAB X demo project that + targets the PIC32 USB II starter kit. Previously all the build + configurations required the Explorer 16 hardware. + + Some of the standard demo tasks have been updated to ensure they execute + correctly with the updated co-operative scheduling behaviour. + + Added comprehensive demo for the Atmel SAM4E, including use of + FreeRTOS+UDP, FreeRTOS+FAT SL and FreeRTOS+CLI. + + FreeRTOS+ Changes: + + + Minor maintenance on FreeRTOS+UDP. + +Changes between V7.5.2 and V7.5.3 released October 14 2013 + + Kernel changes: + + + Prior to V7.5.x yields requested from the tick hook would occur in the + same tick interrupt - revert to that original behaviour. + + New API function uxQueueSpacesAvailable(). + + Introduced the prvTaskExitError() function to Cortex-M0, Cortex-M3/4 + and Cortex-M4F ports. prvTaskExitError() is used to trap tasks that + attempt to return from their implementing functions (tasks should call + vTaskDelete( NULL ); if they want to exit). + + The Cortex-M0 version of portSET_INTERRUPT_MASK_FROM_ISR and + portCLEAR_INTERRUPT_MASK_FROM_ISR are now fully nestable. + + Improved behaviour and robustness of the default Cortex-M tickless idle + behaviour. + + Add workaround for silicon errata PMU_CM001 in Infineon XMC4000 devices to + all Cortex-M4F ports. + + Add Cortex-M0 port for Keil. + + Updated Cortus port. + + Ensure _impure_ptr is initialised before the scheduler is started. + Previously it was not set until the first context switch. + + FreeRTOS+ changes: + + + Update FreeRTOS+UDP to V1.0.1 - including direct integration of the + FreeRTOS+Nabto task, improvements to the DHCP behaviour, and a correction + to the test that prevents the network event hook being called on the first + network down event. The FreeRTOS+UDP change history is maintained + separately. + + Correct the __NVIC_PRIO_BITS setting in the LPC18xx.h header files + provided in the NXP CMSIS library, then update the interrupts used by the + LPC18xx demos accordingly. + + Replace double quotes (") with single quotes (') in FreeRTOS+CLI help + strings to ensure the strings can be used with the JSON descriptions used + in the FreeRTOS+Nabto demos. + + Demo and miscellaneous changes: + + + Added demo for the Atmel SAMD20 Cortex-M0+. The demo includes + FreeRTOS+CLI + + Added a demo for the Infineon Cortex-M0 that can be built with the IAR + Keil and GCC tools. + + Updated the Infineon XMC4000 demos for IAR, Keil, GCC and Tasking tools, + with additional build configurations to directly support the XMC4200 and + XMC4400 devices, in addition to the previously supported XMC4500. + + Updated the demo application. + + Added additional trace macros traceMALLOC and traceFREE to track heap + usage. + +Changes between V7.5.0 and V7.5.2 released July 24 2013 + + V7.5.2 makes the new Cortex-M vPortCheckInterruptPriority() function + compatible with the STM32 standard peripheral driver library, and adds + an extra critical section to the default low power tickless mode + implementation. Only users of the STM32 peripheral library or the default + tickless implementation need update from version 7.5.0. + +Changes between V7.4.2 and V7.5.0 released July 19 2013 + + V7.5.0 is a major upgrade that includes multiple scheduling and efficiency + improvements, and some new API functions. + + Compatibility information for FreeRTOS users: + FreeRTOS V7.5.0 is backward compatible with FreeRTOS V7.4.0 with one + exception; the vTaskList() and vTaskGetRunTimeStats() functions are now + considered legacy, having been replaced by the single uxTaskGetSystemState() + function. configUSE_STATS_FORMATTING_FUNCTIONS must be set to 1 in + FreeRTOSConfig.h for vTaskList() and vTaskGetRunTimeStats() to be + available. + + Compatibility information for FreeRTOS port writers: + vTaskIncrementTick() is now called xTaskIncrementTick() (because it now + returns a value). + + Headline changes: + + + Multiple scheduling and efficiency improvements. + + Core kernel files now pass PC-Lint V8 static checking without outputting + any warnings (information on the test conditions will follow). + + New API functions: + + + uxTaskGetSystemState() http://www.freertos.org/uxTaskGetSystemState.html + + xQueueOverwrite() http://www.freertos.org/xQueueOverwrite.html + + xQueueOverwriteFromISR() + + xQueuePeekFromISR() + + The following ports and demos, which were previously available separately, + are now incorporated into the main FreeRTOS zip file download: + + + ARM Cortex-A9 IAR + + ARM Cortex-A9 ARM compiler + + Renesas RZ + + Microsemi SmartFusion2 + + New FreeRTOSConfig.h settings + http://shop.freertos.org/FreeRTOS_API_and_Configuration_Reference_s/1822.htm + + + configUSE_TIME_SLICING + + configUSE_NEWLIB_REENTRANT + + configUSE_STATS_FORMATTING_FUNCTIONS + + configINCLUDE_APPLICATION_DEFINED_PRIVILEGED_FUNCTIONS + + Other changes: + + + (MPU port only) The configINCLUDE_APPLICATION_DEFINED_PRIVILEGED_FUNCTIONS + options provides a mechanism that allows application writers to execute + certain functions in privileged mode even when a task is running in user + mode. + + Ports that support interrupt nesting now include a configASSERT() that + will trigger if an interrupt safe FreeRTOS function is called from an + interrupt that has a priority designated as above the maximum system/API + call interrupt priority. + + The included FreeRTOS+Trace recorder code has been updated to the latest + version, and the demo applications that use the trace recorder code have + been updated accordingly. + + The FreeRTOS Windows Simulator (MSVC version only) has been updated to + include a new basic 'blinky' build option in addition to the original + comprehensive build option. + + Improve RAM usage efficiency of heap_4.c and heap_2.c. + + Prevent heap_4.c from attempting to free memory blocks that were not + allocated by heap_4.c, or have already been freed. + + As FreeRTOS now comes with FreeRTOS+FAT SL (donated by HCC) the Chan FATfs + files have been removed from FreeRTOS/Demo/Common. + + Fix build error when R4 port is build in co-operative mode. + + Multiple port and demo application maintenance activities. + +Changes between V7.4.1 and V7.4.2 released May 1 2013 + + NOTE: There are no changes in the FreeRTOS kernel between V7.4.1 and V7.4.2 + + + Added FreeRTOS+FAT SL source code and demo project. The demo project + runs in the FreeRTOS Windows simulator for easy and hardware independent + experimentation and evaluation. See http://www.FreeRTOS.org/fat_sl + +Changes between V7.4.0 and V7.4.1 released April 18 2013 + + + To ensure strict conformance with the spec and ensure compatibility with + future chips data and instruction barrier instructions have been added to + the yield macros of Cortex-M and Cortex-R port layers. For efficiency + the Cortex-M port layer "yield" and "yield" from ISR are now implemented + separately as the barrier instructions are not required in the ISR case. + + Added FreeRTOS+UDP into main download. + + Reorganised the FreeRTOS+ directory so it now matches the FreeRTOS + directory with Source and Demo subdirectories. + + Implemented the Berkeley sockets select() function in FreeRTOS+UDP. + + Changed (unsigned) casting in calls to standard library functions with + (size_t) casting. + + Added the Atmel SAM4L and Renesas RX100 demos that demonstrates the + tickless (tick suppression) low power FreeRTOS features. + + Add a new RL78 IAR demo that targets numerous new RL78 chips and + evaluation boards. + + Adjusted stack alignment on RX200 ports to ensure an assert was not + falsely triggered when configASSERT() is defined. + + Updated the Cortex_M4F_Infineon_XMC4500_IAR demo to build with the latest + version of EWARM. + + Corrected header comments in the het.c and het.h files (RM48/TMS570 demo). + + +Changes between V7.3.0 and V7.4.0 released February 20 2013 + + + New feature: Queue sets. See: + http://www.FreeRTOS.org/Pend-on-multiple-rtos-objects.html + + Overhauled the default tickless idle mode implementation provided with the + ARM Cortex-M3 port layers. + + Enhanced tickless support in the core kernel code with the introduction of + the configEXPECTED_IDLE_TIME_BEFORE_SLEEP macro and the + eTaskConfirmSleepModeStatus() function. + + Added the QueueSet.c common demo/test file. Several demo applications + have been updated to use the new demo/test tasks. + + Removed reliance on the PLIB libraries from the MPLAB PIC32 port layer and + demo applications. + + Added the FreeRTOS+Trace recorder code to the MSVC Win32 demo. + + Renamed eTaskStateGet() to eTaskGetState() for consistency, and added a + pre-processor macro for backward compatibility with the previous name. + + Updated functions implemented in the core queue.c source file to allow + queue.h to be included from the .c file directly (this prevents compiler + warnings that were generated by some compilers). + + Updated the CCS Cortex-R4 port layer to replace the CLZ assembler function + with the CLZ compiler intrinsic that is provided by the latest versions of + the CCS ARM compiler. + + Updated all heap_x.c implementations to replace the structure that was + used to ensure the start of the heap was aligned with a more portable + direct C code implementation. + + Added support for PIC24 devices that include EDS. + + Minor optimisations to the PIC32 port layer. + + Minor changes to tasks.c that allow the state viewer plug-ins to display + additional information. + + Bug fix: Update prvProcessReceivedCommands() in timers.c to remove an + issue that could occur if the priority of the timer daemon task was set + below the priority of tasks that used timer services. + + Update the FreeRTOS+Trace recorder code to the latest version. + +Changes between V7.2.0 and V7.3.0 released October 31 2012 + + + Added ability to override the default scheduler task selection mechanism + with implementations that make use of architecture specific instructions. + + Added ability to suppress tick interrupts during idle time, and in so + doing, provide the ability to make use of architecture specific low power + functionality. + + Added the portSUPPRESS_TICKS_AND_SLEEP() macro and vTaskStepTick() helper + function. + + Added the configSYSTICK_CLOCK_HZ configuration constant. + + Reworked the Cortex-M3 and Cortex-M4F port layers for GCC, Keil and IAR to + directly support basic power saving functionality. + + Added hooks to allow basic power saving to be augmented in the application + by making use of chip specific functionality. + + Minor change to allow mutex type semaphores to be used from interrupts + (which would not be a normal usage model for a mutex). + + Change the behaviour of the interrupt safe interrupt mask save and restore + macros in the Cortex-M ports. The save macro now returns the previous + mask value. The restore macro now uses the previous mask value. These + changes are not necessary for the kernel's own implementation, and are + made purely because the macros were being used by application writers. + + Added eTaskStateGet() API function. + + Added port specific optimisations to the PIC32 port layer, and updated the + PIC32 demo applications to make use of this new feature. + + Added port specific optimisations to the Win32 simulator port. + + Added new ports and demo applications for the TI Hercules RM48 and TMS570 + safety microcontrollers. + + Added SAM3 demos targeting the ATSAM3S-EK2 and ATSAM3X-EK evaluation + boards. + + Updated the PIC32 MPLAB X project to manually set the compiler include + paths instead of using the IDE entry box following reports that the + include paths were somehow being deleted. + + Improved character handling in FreeRTOS+CLI. + +Changes between V7.1.1 and V7.2.0 released 14 August 2012 + + FreeRTOS V7.2.0 is backward compatible with FreeRTOS V7.1.2. + + + Added a FreeRTOS+ sub-directory. The directory contains some FreeRTOS+ + source code, and example projects that use the FreeRTOS Win32 simulator. + + Added a new example heap allocation implementation (heap_4.c) that + includes memory block coalescence. + + Added a demo that targets the Atmel SAM4S Cortex-M4 based microcontroller. + The demo is preconfigured to build using the free Atmel Studio 6 IDE and + GCC compiler. + + Added xSemaphoreTakeFromISR() implementation. + + The last parameter in ISR safe FreeRTOS queue and semaphore functions + (xHigherPriorityTaskWoken) is now optional and can be set to NULL if it + is not required. + + Update the IAR and MSP430X ports to clear all lower power mode bits before + exiting the tick interrupt [bug fix]. + + Allow xQueueReset() to be used, even when the queues event lists are not + empty. + + Added a vQueueDelete() handler for the FreeRTOS MPU port (this was + previously missing). + + Updated the vPortSVCHandler() functions in the FreeRTOS MPU port layer to + ensure it compiles with the latest ARM GCC compilers from Linaro. + + Updated the prvReadGP() function in the NIOS II port to ensure the compiler + can choose any register for the functions parameter (required at high + compiler optimisation levels). + + Add #error macros into the Keil and IAR Cortex-M ports to ensure they + cannot be built if the user has set configMAX_SYSCALL_INTERRUPT_PRIORITY + to 0. + + Added comments in the FreeRTOSConfig.h files associated with Cortex-M3 and + Cortex-M4 demos stating that the configMAX_SYSCALL_INTERRUPT_PRIORITY + parameter must not be set to 0. + + Introduce new INCLUDE_xQueueGetMutexHolder configuration constant + (defaulted to 0). + + Added two new list handling macros - for internal use only in upcoming new + products. + + Removed all mention of the legacy vTaskStartTrace and ulTaskEndTrace + macros. FreeRTOS+Trace supersedes the legacy trace. + + Added a configASSERT() into the vPortFree() function in heap_1.c as it is + invalid for the function to be called. + + Made the xRxLock and xTxLock members of the queue structure volatile. + This is probably not necessary, and is included as a precautionary + measure. + + Modify the assert() that checks to see if the priority passed into an + xTaskCreate() function is within valid bounds to permit the assert to be + used in the FreeRTOS MPU port. + + The software timer service (daemon) task is now created in a way that + to ensure compatibility with FreeRTOS MPU. + +Changes between V7.1.0 and V7.1.1 released May 1 2012 + + New ports: + + The following ports are brand new: + + Cortex-M3 Tasking + + The following ports have been available as separate downloads for a number + of months, but are now included in the main FreeRTOS download. + + Cortex-M0 IAR + + Cortex-M0 GCC + + Cortex-M4F GCC (with full floating point support) + + + New demos: + + The following demos are brand new: + + Renesas RX63N RDK (Renesas compiler) + + The following demos have been available as separate downloads for a number + of months, but are now included in the main FreeRTOS download. + + NXP LPC1114 GCC/LPCXpresso + + ST STM32F0518 IAR + + Infineon XMC4500 GCC/Atollic + + Infineon XMC4500 IAR + + Infineon XMC4500 Keil + + Infineon XMC4500 Tasking + + + Kernel miscellaneous / maintenance: + + + Introduced the portSETUP_TCB() macro to remove the requirement for the + Windows simulator to use the traceTASK_CREATE() macro, leaving the trace + macro available for use by FreeRTOS+Trace (http://www.FreeRTOS.org/trace). + + Added a new trace macro, traceMOVE_TASK_TO_READY_STATE(), to allow future + FreeRTOS+Trace versions to provide even more information to users. + + Updated the FreeRTOS MPU port to be correct for changes that were + introduced in FreeRTOS V7.1.0. + + Introduced the xQueueReset() API function. + + Introduced the xSemaphoreGetMutexHolder() API function. + + Tidy up various port implementations to add the static key word where + appropriate, and remove obsolete code. + + Slight change to the initial stack frame given to the RX600 ports to allow + them to be used in the Eclipse based E2Studio IDE without confusing GDB. + + Correct the alignment given to the initial stack of Cortex-M4F tasks. + + Added a NOP following each DINT instruction on MSP430 devices for strict + conformance with the instructions on using DINT. + + Changed the implementation of thread deletes in the Win32 port to prevent + the port making use of the traceTASK_DELETE() trace macros - leaving this + macro free for use by FreeRTOS+Trace. + + Made some benign changes to the RX600 Renesas compiler port layer to + ensure the code can be built to a library without essential code being + removed by the linker. + + Reverted the change in the name of the uxTaskNumber variable made in + V7.1.0 as it broke the IAR plug-in. + + + Demo miscellaneous / maintenance: + + + The command interpreter has now been formally released as FreeRTOS+CLI, + and been moved out of the main FreeRTOS download, to instead be available + from the FreeRTOS+ Ecosystem site http://www.FreeRTOS.org/plus. + + flash_timer.c/h has been added to the list of standard demo tasks. This + performs the same functionality as the flash.c tasks, but using software + timers in place of tasks. + + Upgraded the PIC32 demo as follows: Changes to how the library functions + are called necessitated by the new compiler version, addition of MPLAB X + project with PIC32MX360, PIC32MX460 and PIC32MX795 configurations, + addition of simply blinky demo, updated FreeRTOSConfig.h to include more + parameters, addition of hook function stubs. + + The MSP430X IAR and CCS demos have been updated to ensure the power + settings are correct for the configured CPU frequency. + + Rowley CrossWorks projects have been updated to correct the "multiple + definition of ..." warnings introduced when the toolchain was updated. + + Updated various FreeRTOSConfig.h header files associated with projects + that build with Eclipse to include a #error statement informing the user + that the CreateProjectDirectoryStructure.bat batch file needs to be + executed before the projects can be opened. + + Renamed directories that included "CCS4" in their name to remove the '4' + and instead just be "CCS". This is because the demo was updated and + tested to also work with later Code Composer Studio versions. + + Updated the TCP/IP periodic timer frequency in numerous uIP demos to be + 50ms instead of 500ms. + +Changes between V7.0.2 and V7.1.0 released December 13 2011 + + New ports: + + + Cortex-M4F IAR port. + + Cortex-M4F Keil/RVDS port. + + TriCore GCC port. + + New demos: + + + NXP LPC4350 using the Keil MDK, and demonstrated on a Hitex development + board. + + ST STM32F407 using the IAR Embedded Workbench for ARM, and demonstrated on + the IAR STM32F407ZG-SK starter kit. + + Infineon TriCore TC1782, using the GCC compiler, demonstrated on the + TriBoard TC1782 evaluation board. + + Renesas RX630, using the Renesas compiler and HEW, demonstrated on an + RX630 RSK (Renesas Starter Kit). + + Miscellaneous / maintenance: + + + Removed all calls to printf() from the K60/IAR Kinetis demo so the project + can execute stand alone - without being connected to the debugger. + + Completed the command interpreter framework. Command handlers now receive + the entire command string, giving them direct access to parameters. + Utility functions are provided to check the number of parameters, and + return parameter sub-strings. + + The previously documented fix for the bug in xTaskResumeFromISR() that + effected (only) ports supporting interrupt nesting has now been + incorporated into the main release. + + The portALIGNMENT_ASSERT_pxCurrentTCB() definition has been added to allow + specific ports to skip the second stack alignment check when a task is + created. This is because the second check is not appropriate for some + ports - including the new TriCore port where the checked pointer does not + actually point to a stack. + + The portCLEAN_UP_TCB() macro has been added to allow port specific clean + up when a task is deleted - again this is required by the TriCore port. + + Various other minor changes to ensure warning free builds on a growing + number of microcontroller and toolchain platforms. This includes a + (benign) correction to the prototype of the + vApplicationStackOverflowHook() definition found in lots of recent demos. + + Trace system: + + + The legacy trace mechanism has been completely removed - it has been + obsolete for the years since the trace macros were introduced. The + configuration constant configUSE_TRACE_FACILITY is now used to optionally + include additional queue and task information. The additional information + is intended to make the trace mechanism more generic, and allow the trace + output to provide more information. When configUSE_TRACE_FACILITY is set + to 1: + - the queue structure includes an additional member to hold the queue + type, which can be base, mutex, counting semaphore, binary semaphore + or recursive mutex. + - the queue structure includes an additional member to hold a queue + number. A trace tool can set and query the queue number for its own + purposes. The kernel does not use the queue number itself. + - the TCB structure includes an additional member to hold a task number + number. A trace tool can set and query the task number for its own + purposes. The kernel does not use the task number itself. + + Queues and all types of semaphores are now automatically allocated their + type as they are created. + + Added two new trace macros - traceTASK_PRIORITY_INHERIT() and + traskTASK_PRIORITY_DISINHERIT(). + + Updated the traceQUEUE_CREATE_FAILED() macro to take a parameter that + indicates the type of queue, mutex, or semaphore that failed to be + created. + + The position from which traceCREATE_MUTEX() is called has been moved from + after the call to xQueueGenericSend() [within the same function] to before + the call. This ensures the trace events occur in the correct order. + + The value passed into tracePRIORITY_SET() has been corrected for the case + where vTaskPrioritySet() is called with a null parameter. + +Changes between V7.0.1 and V7.0.2 released September 20 2011 + + New ports: + + + The official FreeRTOS Renesas RX200 port and demo application have been + incorporated into the main FreeRTOS zip file download. + + The official FreeRTOS Renesas RL78 port and demo application have been + incorporated into the main FreeRTOS zip file download. + + The official FreeRTOS Freescale Kinetis K60 tower demo application has + been incorporated into the main FreeRTOS zip file download. This includes + an embedded web server example. + + A new Microblaze V8 port layer has been created to replace the older, now + deprecated, port layer. The V8 port supports V8.x of the Microblaze IP, + including exceptions, caches, and the floating point unit. A new + Microblaze demo has also been added to demonstrate the new Microblaze V8 + port layer. The demo application was created using V13.1 of the Xilinx + EDK, and includes a basic embedded web server that uses lwIP V1.4.0. + + The official FreeRTOS Fujitsu FM3 MB9A310 demo application has been + incorporated into the main FreeRTOS zip file download. Projects are + provided for both the IAR and Keil toolchains. + + + API additions: + + + xTaskGetIdleTaskHandle() has been added. + + xTaskGetTimerDaemonTaskHandle() has been added. + + pcTaskGetTaskName() has been added. + + vSemaphoreDelete() macro has been added to make it obvious how to delete + a semaphore. In previous versions vQueueDelete() had to be used. + + vTaskCleanUpResources() has been removed. It has been obsolete for a + while. + + portPOINTER_SIZE_TYPE has been introduced to prevent compiler warnings + being generated when the size of a pointer does not match the size of + the stack type. This will (has already) be used in new ports, but will + not be retrofitted to existing ports until the existing port itself is + updated. + + Other updates and news: + + + The core files have all been modified to tighten the coding standard even + further. These are style, not functional changes. + + All ARM7 port layers have been slightly modified to prevent erroneous + assert() failures when tasks are created and configASSERT() is defined. + + All ARM IAR projects have been updated to build with the latest V6.2.x + versions of the IAR Embedded Workbench for ARM tools (EWARM). This was + necessary due to a change in the way EWARM uses the CMSIS libraries. + + The PIC32 port layer has been updated in preparation for V2 of the C32 + compiler. + + The old Virtex-4 Microblaze demo has been marked as deprecated. Please + use the brand new Spartan-6 port and demo in its place. + + The bones of a new generic command interpreter is located in + FreeRTOS/Demo/Common/Utils/CommandInterpreter.c. This is still a work in + progress, and not documented. It is however already in use. It will be + documented in full when the projects that are already using it are + completed. + + A couple of new standard demos have been included. First, a version of + flop.c called sp_flop.c. This is similar to flop.c, but uses single + precision floats in place of double precision doubles. This allows the + for testing ports to processors that have only single precision floating + point units, and revert to using emulated calculations whenever a double + is used. Second, comtest_strings.c has been included to allow the test + of UART drivers when an entire string is transmitted at once. The + previous comtest.c only used single character transmission and reception. + + lwIP V1.4.0 is now included in the FreeRTOS/Demo/Common directory, and + used by a couple of new demos. + +Changes between V7.0.0 and V7.0.1 released May 13 2011 + + + Added a Fujitsu FM3 demo application for both the IAR and Keil tool + chains. + + Added a SmartFusion demo application for all of the IAR, Keil and + SoftConsole (GCC/Eclipse) tool chains. + + Updated the RX600 port and demo applications to take into account the + different semantics required when using the latest (V1.0.2.0) version of + the Renesas compiler. + + Modified the RX600 Ethernet driver slightly to make it more robust under + heavy load, and updated the uIP handling task to make use of the FreeRTOS + software timers. + + Slightly changed the PIC32 port layer to move an ehb instruction in line + with the recommendations of the MIPS core manual, and ensure 8 byte stack + alignment is truly always obtained. + + Changed the behaviour when tasks are suspended before the scheduler has + been started. Before, there needed to be at least one task that was not + in the suspended state. This is no longer the case. + +Changes between V6.1.1 and V7.0.0 released April 8 2011 + + FreeRTOS V7.0.0 is backward compatible with FreeRTOS V6.x.x + + Main changes: + + + Introduced a new software timer implementation. + + Introduced a new common demo application file to exercise the new timer + implementation. + + Updated the Win32/MSVC simulator project to include the new software timer + demo tasks and software timer tick hook test. Much simpler software timer + demonstrations are included in the demo projects for both of the new ports + (MSP430X with CCS4 and STM32 with TrueStudio). + + Various enhancements to the kernel implementation in tasks.c. These are + transparent to users and do not effect the pre-existing API. + + Added calls to configASSERT() within the kernel code. configASSERT() is + functionally equivalent to the standard C assert() macro, but does not + rely on the compiler providing assert.h. + + Other changes: + + + Updated the MSP430X IAR port and demo project to include support for the + medium memory model. + + Added a demo project for the MSP430X that targets the MSP430X Discovery + board and uses the Code Composer Studio 4 tools. This demo includes use + of the new software timer implementation. + + Added an STM32F100RB demo project that targets the STM32 Discovery Board + and uses the TrueStudio Eclipse based IDE from Atollic. + + Removed some compiler warnings from the PSoC demo application. + + Updated the PIC32 port layer to ensure the + configMAX_SYSCALL_INTERRUPT_PRIORITY constant works as expected no matter + what its value is (within the valid range set by the microcontroller + kernel). + + Updated the PIC24, dsPIC and PIC32 projects so they work with the latest + MPLAB compiler versions from Microchip. + + Various cosmetic changes to prepare for a standards compliance statement + that will be published after the software release. + + +Changes between V6.1.0 and V6.1.1 released January 14 2011 + + + Added two new Windows simulator ports. One uses the free Microsoft Visual + Studio 2010 express edition, and the other the free MingW/Eclipse + environment. Demo projects are provided for both. + + Added three demo projects for the PSoC 5 (CYAC5588). These are for the + GCC, Keil, and RVDS build tools, and all use the PSoC Creator IDE. + + Added a demo for the low power STM32L152 microcontroller using the IAR + Embedded Workbench. + + Added a new port for the MSP430X core using the IAR Embedded Workbench. + + Updated all the RX62N demo projects that target the Renesas Demonstration + Kit (RDK) to take into account the revered LED wiring on later hardware + revisions, and the new J-Link debug interface DLL. + + Updated all the RX62N demo projects so the IO page served by the example + embedded web server works with all web browsers. + + Updated the Red Suite projects to work with the up coming Red Suite + release, and to use a more recent version of the CMSIS libraries. + + Added the traceTAKE_MUTEX_RECURSIVE_FAILED() trace macro. + + Removed the (pointless) parameter from the traceTASK_CREATE_FAILED() + trace macro. + + Introduced the portALT_GET_RUN_TIME_COUNTER_VALUE() macro to compliment + the already existing portGET_RUN_TIME_COUNTER_VALUE(). This allows for + more flexibility in how the time base for the run time statistics feature + can be implemented. + + Added a "cpsie i" instruction before the "svc 0" instruction used to start + the scheduler in each of the Cortex M3 ports. This is to ensure that + interrupts are globally enabled prior to the "svc 0" instruction being + executed in cases where interrupts are left disabled by the C start up + code. + + Slight optimisation in the run time stats calculation. + +Changes between V6.0.5 and V6.1.0 released October 6 2010 + + + Added xTaskGetTickCountFromISR() function. + + Modified vTaskSuspend() to allow tasks that have just been created to be + immediately suspended even when the kernel has not been started. This + allows them to effectively start in the Suspended state - a feature that + has been asked for on numerous occasions to assist with initialisation + procedures. + + Added ports for the Renesas RX62N using IAR, GCC and Renesas tool suites. + + Added a STM32F103 demo application that uses the Rowley tools. + + Under specific conditions xFreeBytesRemaining within heap_2.c could end up + with an incorrect value. This has been fixed. + + xTaskCreateGeneric() has a parameter that can be used to pass the handle + of the task just created out to the calling task. The assignment to this + parameter has been moved to ensure it is assigned prior to the newly + created having any possibility of executing. This takes into account the + case where the assignment is made to a global variable that is accessed by + the newly created task. + + Fixed some build time compiler warnings in various FreeTCPIP (based on + uIP) files. + + Fixed some build time compiler warnings in Demo/Common/Minimal/IntQueue.c. + +Changes between V6.0.4 and V6.0.5 released May 17 2010 + + + Added port and demo application for the Cortus APS3 processor. + +Changes between V6.0.3 and V6.0.4 released March 14 2010 + + + All the contributed files that were located in the Demo/Unsupported_Demos + directory have been removed. These files are instead now available in the + new Community Contributions section of the FreeRTOS website. See + http://www.freertos.org/RTOS-contributed-ports.html + + The project file located in the Demo/CORTEX_STM32F107_GCC_Rowley directory + has been upgraded to use V2.x of the Rowley Crossworks STM32 support + package. + + An initial Energy Micro EFM32 demo has been included. This will be + updated over the coming months to make better use of the low power modes + the EFM32 provides. + +Changes between V6.0.2 and V6.0.3 released February 26 2010 + + + SuperH SH7216 (SH2A-FPU) port and demo application added. + + Slight modification made to the default implementation of + pvPortMallocAligned() and vPortFreeAligned() macros so by default they + just call pvPortMalloc() and vPortFree(). The macros are only needed to + be defined when a memory protection unit (MPU) is being used - and then + only depending on other configuration settings. + +Changes between V6.0.1 and V6.0.2 released January 9th 2010 + + + Changed all GCC ARM 7 ports to use 0 as the SWI instruction parameter. + Previously the parameter was blank and therefore only an implicit 0 but + newer GCC releases do not permit this. + + Updated IAR SAM7S and SAM7X ports to work with IAR V5.40. + + Changed the stack alignment requirement for PIC32 from 4 bytes to 8 bytes. + + Updated prvListTaskWithinSingleList() is it works on processors where the + stack grows up from low memory. + + Corrected some comments. + + Updated the startup file for the RVDS LPC21xx demo. + +Changes between V6.0.0 and V6.0.1 released November 15th 2009 + + + Altered pxPortInitialiseStack() for all Cortex-M3 ports to ensure the + stack pointer is where the compiler expects it to be when a task first + starts executing. + + The following minor changes only effect the Cortex-M3 MPU port: + + + portRESET_PRIVILEGE() assembly macro updated to include a clobber list. + + Added prototypes for all the privileged function wrappers to ensure no + compile time warnings are generated no matter what the warning level + setting. + + Corrected the name of portSVC_prvRaisePrivilege to + portSVC_RAISE_PRIVILEGE. + + Added conditional compilation into xTaskGenericCreate() to prevent some + compilers issuing warnings when portPRIVILEGE_BIT is defined as zero. + + +Changes between V5.4.2 and V6.0.0 released October 16th 2009 + + FreeRTOS V6 is backward compatible with FreeRTOS V5.x. + + Main changes: + + + FreeRTOS V6 is the first version to include memory protection unit (MPU) + support. Two ports now exist for the Cortex M3, the standard FreeRTOS + which does not include MPU support, and FreeRTOS-MPU which does. + + xTaskCreateRestricted() and vTaskAllocateMPURegions() API functions added + in support of FreeRTOS-MPU. + + Wording for the GPL exception has been (hopefully) clarified. Also the + license.txt file included in the download has been fixed (the previous + version contained some corruption). + + Other changes: + + + New API function xPortGetFreeHeapSize() added to heap_1.c and heap_2.c. + + ARM7 GCC demo interrupt service routines wrappers have been modified to + call the C portion using an __asm statement. This prevents the function + call being inlined at higher optimisation levels. + + ARM7 ports now automatically set the THUMB bit if necessary when + setting up the initial stack of a task - removing the need for + THUMB_INTERWORK to be defined. This also allows THUMB mode and ARM mode + tasks to be mixed more easily. + + All ARM7/9 ports now have portBYTE_ALIGNMENT set to 8 by default. + + Various demo application project files have been updated to be up to date + with the latest IDE versions. + + The linker scripts used with command line GCC demos have been updated to + include an eh_frame section to allow their use with the latest Yagarto + release. Likewise the demo makefiles have been updated to include + command line options to reduce or eliminate the eh_frame section all + together. + + The definition of portBYTE_ALIGNMENT_MASK has been moved out of the + various memory allocation files and into the common portable.h header + file. + + Removed unnecessary use of portLONG, portSHORT and portCHAR. + + Added LM3Sxxxx demo for Rowley CrossWorks. + + Posix simulator has been upgraded - see the corresponding WEB page on the + FreeRTOS.org site. + + +Changes between V5.4.1 and V5.4.2 released August 9th 2009 + + + Added a new port and demo app for the Altera Nios2 soft core. + + Added LPC1768 demo for IAR. + + Added a USB CDC demo to all LPC1768 demos (Code Red, CrossWorks and IAR). + + Changed clock frequency of LPC1768 demos to 99MHz. + +Changes between V5.4.0 and V5.4.1 released July 25th 2009 + + + New hook function added. vApplicationMallocFailedHook() is (optionally) + called if pvPortMalloc() returns NULL. + + Additional casting added to xTaskCheckForTimeOut(). This prevents + problems that can arise should configUSE_16_BIT_TICKS be set to 1 on a + 32 bit architecture (which would probably be a mistake, anyway). + + Corrected the parameter passed to NVIC_SetPriority() to set the MAC + interrupt priority in both LPC1768 demos. + + Decreased the default setting of configMINIMAL_STACK_SIZE in the PIC32 + demo application to ensure the heap space was not completely consumed + before the scheduler was started. + +Changes between V5.3.1 and V5.4.0 released July 13th 2009 + + + Added Virtex5 / PPC440 port and demos. + + Replaced the LPC1766 Red Suite demo with an LPC1768 Red Suite demo. The + original demo was configured to use engineering samples of the CPU. The + new demo has an improved Ethernet driver. + + Added LPC1768 Rowley demo with zero copy Ethernet driver. + + Reworked byte alignment code to ensure 8 byte alignment works correctly. + + Set configUSE_16_BIT_TICKS to 0 in the PPC405 demo projects. + + Changed the initial stack setup for the PPC405 to ensure the small data + area pointers are setup correctly. + +Changes between V5.3.0 and V5.3.1 released June 21st 2009 + + + Added ColdFire V1 MCF51CN128 port and WEB server demo. + + Added STM32 Connectivity Line STM32107 Cortex M3 WEB server demo. + + Changed the Cortex M3 port.c asm statements to __asm so it can be + compiled using Rowley CrossWorks V2 in its default configuration. + + Updated the Posix/Linux simulator contributed port. + +Changes between V5.2.0 and V5.3.0 released June 1st 2009 + + Main changes: + + + Added new (optional) feature that gathers statistics on the amount of CPU + time used by each task. + + Added a new demo application for the Atmel AT91SAM3U Cortex-M3 based + microcontroller. + + Added a new demo application for the NXP LPC1766 Cortex-M3 based + microcontroller. + + Added a contributed port/demo that allows FreeRTOS to be 'simulated' in a + Linux environment. + + Minor changes: + + Updated the Stellaris uIP WEB server demos to include the new run time + statistics gathering feature - and include a served WEB page that + presents the information in a tabular format. + + Added in the lwIP port layer for the Coldfire MCF52259. + + Updated the CrossWorks LPC2368 WEB server to include an image in the + served content. + + Changed some of the timing in the initialisation of the LPC2368 MAC to + permit its use on all part revisions. + + Minor modifications to the core uIP code to remove some compiler warnings. + + Added xTaskGetApplicationTaskTag() function and updated the OpenWatcom + demo to make use of the new function. + + Added contributed demos for AVR32 AP7000, STM32 Primer 2 and STM32 using + Rowley Crossworks. + + Heap_1.c and Heap_2.c used to define structures for the purpose of data + alignment. These have been converted to unions to save a few bytes of + RAM that would otherwise be wasted. + + Remove the call to strncpy() used to copy the task name into the TCB when + the maximum task name is configured to be 1 byte long. + +Changes between V5.1.2 and V5.2.0 released March 14th 2009 + + + Optimised the queue send and receive functions (also used by semaphores). + + Replaced the standard critical sections used to protect BIOS calls in the + PC port to instead use scheduler locks. This is because the BIOS calls + always return with interrupts enabled. + + Corrected unclosed comments in boot.s. + +Changes between V5.1.1 and V5.1.2 released February 9th 2009 + + + Added NEC V850ES port and demo. + + Added NEC 78K0R port and demo. + + Added MCF52259 port and demo. + + Added the AT91SAM9XE port and demo. + + Updated the MCF52233 FEC driver to work around a silicon bug that + prevents the part auto negotiating some network parameters. + + Minor modifications to the MCF52233 makefile to permit it to be used + on Linux hosts. + + Updated the STM32 primer files to allow them to be built with the latest + version of the RIDE tools. + + Updated the threads.js Java script used for kernel aware debugging in + the Rowley CrossWorks IDE. + + +Changes between V5.1.0 and V5.1.1 released November 20, 2008 + + + Added Coldfire MCF52233 WEB server demo using GCC and Eclipse. + + Added IAR MSP430 port and demo. + + Corrected several compiler time issues that had crept in as tool versions + change. + + Included FreeRTOS-uIP - a faster uIP. This is not yet complete. + +Changes between V5.0.4 and V5.1.0 released October 24, 2008 + + + Added a new port and demo application for the ColdFire V2 core using the + CodeWarrior development tools. + + Replaced the ARM7 demo that used the old (and now no longer supported) + Keil compiler with a new port that uses the new Keil/RVDS combo. + + Stack overflow checking now works for stacks that grow up from low + memory (PIC24 and dsPIC). + + BUG FIX - set the PIC32 definition of portSTACK_GROWTH to the correct + value of -1. + + MSP430 port layers have been updated to permit tasks to place the + microcontroller into power down modes 1 to 3. The demo applications have + likewise been updated to demonstrate the new feature. + + Replaced the two separate MSP430/Rowley port layers with a single and more + flexible version. + + Added more contributed ports, including ports for NEC and SAM9 + microcontrollers. + + Changed the linker script used in the LPC2368 Eclipse demo. + +Changes between V5.0.3 and V5.0.4 released September 22, 2008 + + + Completely re-written port for ColdFire GCC. + + Bug fix: All Cortex M3 ports have a minor change to the code that sets + the pending interrupt. + + Some header files require that FreeRTOS.h be included prior to their + inclusion. #error message have been added to all such header file + informing users to the cause of the compilation error should the headers + not be included in the correct order. + +Changes between V5.0.2 and V5.0.3 released July 31, 2008 + + Changes relating to the Cortex M3: + + + Added configMAX_SYSCALL_INTERRUPT_PRIORITY usage to all the Cortex M3 + ports and demos. See the port documentation pages on the FreeRTOS.org + WEB site for full usage information. + + Improved efficiency of Cortex M3 port even further. + + Ensure the Cortex M3 port works no matter where the vector table is + located. + + Added the IntQTimer demo/test tasks to a demo project for each CM3 port + (Keil, GCC and IAR) to test the new configMAX_SYSCALL_INTERRUPT_PRIORITY + functionality. + + Added the mainINCLUDE_WEB_SERVER definition to the LM3SXXXX IAR and Keil + projects to allow the WEB server to be conditionally excluded from the + build and therefore allow use of the KickStart (code size limited) + compiler version. + + Other changes: + + + Moved the PIC24 and dsPIC versions of vPortYield() from the C file to + an assembly file to allow use with all MPLAB compiler versions. This also + allows the omit-frame-pointer optimisation to be turned off. + +Changes between V5.0.0 and V5.0.2 released May 30, 2008 + + + Updated the PIC32 port to allow queue API calls to be used from + interrupts above the kernel interrupt priority, and to allow full + interrupt nesting. Task stack usages has also been reduced. + + Added a new PowerPC port that demonstrates how the trace macros can be + used to allow the use of a floating point co-processor. The + traceTASK_SWITCHED_OUT() and traceTASK_SWITCHED_INT() macros are used to + save and restore the floating point context respectively for those tasks + that actually use floating point operations. + + BUG FIX: The first PPC405 port contained a bug in that it did not leave + adequate space above the stack for the backchain to be saved when a task + started to execute for the first time. + + Updated queue.c to add in the means to allow interrupt nesting and for + queue API functions to be called from interrupts that have a priority + above the kernel priority. This is only supported on PIC32 ports thus + far. + + Fixed the compiler warnings that were generated when the latest version + of WinAVR was used. + + Remove all inline usage of 'inline' from the core kernel code. + + Added the queue registry feature. The queue registry is provided as a + means for kernel aware debuggers to locate queue definitions. It has no + purpose unless you are using a kernel aware debugger. The queue registry + will only be used when configQUEUE_REGISTRY_SIZE is greater than zero. + + Added the ST Cortex-M3 drivers into the Demo/Common/Drivers directory to + prevent them from having to be included in multiple demos. + + Added a Keil STM32 demo application. + + Changed the blocktim.c test files as it is no longer legitimate for all + ports to call queue API functions from within a critical section. + + Added the IntQueue.c test file to test the calling of queue API functions + from different interrupt priority levels, and test interrupt nesting. + +Changes between V5.0.0 and V5.0.1 + + + V5.0.1 was a customer specific release. + +Changes between V4.8.0 and V5.0.0 released April 15, 2008 + + *** VERY IMPORTANT INFORMATION ON UPGRADING TO FREERTOS.ORG V5.0.0 *** + + The parameters to the functions xQueueSendFromISR(), xQueueSendToFrontFromISR(), + xQueueSendToBackFromISR() and xSemaphoreGiveFromISR() have changed. You must + update all calls to these functions to use the new calling convention! Your + compiler might not issue any type mismatch warnings! + + + See http://www.FreeRTOS.org/upgrading.html for full information. + + + Other changes: + + + Support added for the new Luminary Micro LM3S3768 and LM3S3748 Cortex-M3 + microcontrollers. + + New task hook feature added. + + PowerPC demo updated to use version 10.1 of the Xilinx EDK. + + Efficiency gains within the PIC32 port layer. + +Changes between V4.7.2 and V4.8.0 released March 26 2008 + + + Added a Virtex4 PowerPC 405 port and demo application. + + Added optional stack overflow checking and new + uxTaskGetStackHighWaterMark() function. + + Added new xQueueIsQueueEmptyFromISR(), xQueueIsQueueFullFromISR() and + uxQueueMessagesWaitingFromISR() API functions. + + Efficiency improvements to the Cortex-M3 port layer. NOTE: This + requires that an SVC handler be installed in the application. + + Efficiency improvements to the queue send and receive functions. + + Added new trace macros. These are application definable to provide + a flexible trace facility. + + Implemented the configKERNEL_INTERRUPT_PRIORITY within the Keil Cortex + M3 port layer (bringing it up to the same standard as the IAR and GCC + versions). + + Ports that used the arm-stellaris-eabi-gcc tools have been converted to + use the arm-non-eabi-gcc tools. + +Changes between V4.7.1 and V4.7.2 released February 21, 2008 + + + Added Fujitsu MB91460 port and demo. + + Added Fujitsu MB96340 port and demo. + + Tidied up the capitalisation of include files to facilitate builds on + Linux hosts. + + Removed some redundant casting that was generating warnings - but was + included to remove warnings on other compilers. + +Changes between V4.7.0 and V4.7.1 released February 3, 2008 + + + Updated all IAR ARM projects to use V5.11 of the IAR Embedded Workbench + for ARM. + + Introduced recursive semaphore feature. + + Updated LPC2368 demos to take into account silicon bugs in old chip + revisions. + + Updated STR9 uIP port to manually set the net mask and gateway addresses. + + Updating demos to allow more to run with the co-operative scheduler. + + Fixed co-operative scheduler behaviour upon the occurrence of a tick + interrupt while the scheduler was suspended. + + Updated documentation contained within semphr.h. + + ARM7 GCC ports no longer use the IRQ attribute. + +Changes between V4.6.1 and V4.7.0 released December 6, 2007 + + + Introduced the counting semaphore macros and demo source files. The + Open Watcom PC project has been updated to include the new demo. See + the online documentation for more information. + + Introduced the 'alternative' queue handling API and demo source files. + The Open Watcom PC project has been updated to include the new demo + source files. See the online documentation for more information. + + Added AT91SAM7X Eclipse demo project. + + Added the STM32 primer demo project for the GCC compiler and Ride IDE. + + Removed the .lock files that were mistakenly included in the V4.6.1 + eclipse workspaces. + +Changes between V4.6.0 and V4.6.1 released November 5 2007 + + + Added support for the MIPS M4K based PIC32. + + Added 'extern "C"' to all the header files to facilitate use with C++. + +Changes between V4.5.0 and V4.6.0 released October 28 2007 + + + Changed the method used to force a context switch within an ISR for the + ARM7/9 GCC ports only. The portENTER_SWITCHING_ISR() and + portEXIT_SWITCHING_ISR() macros are no longer supported. This is to + ensure correct behaviour no matter which GCC version is used, with or + without the -fomit-frame-pointer option, and at all optimisation levels. + + Corrected the prototype for xQueueGenericSend() within queue.h. + +Changes between V4.4.0 and V4.5.0 released September 17 2007 + + + Added the xQueueSendToFront(), xQueueSendToBack() and xQueuePeek() + functionality. These should now be used in preference to the old + xQueueSend() function - which is maintained for backward compatibility. + + Added Mutex functionality. The behaviour of mutexes is subtly different + to the already existing binary semaphores as mutexes automatically + include a priority inheritance mechanism. + + Added the GenQTest.c and QPeek.c to test and demonstrate the behaviour + of the new functionality. + + Updated the LM3Sxxxx and PC ports to include the new GenQTest.c and + QPeek.c files. + + Updated the GCC port for the Cortex M3 to include the + configKERNEL_INTERRUPT_PRIORITY functionality. This was previously only + included in the IAR port. + + Optimised the GCC and IAR port layer code - specifically the context + switch code. + + Consolidated the LM3Sxxxx EK demos for all development tools into a + single project that automatically detects which version of the EK the + application is executing on. + + Added Eclipse support for LM3Sxxxx evaluation kits. + + Added Eclipse support for the Keil LPC2368 evaluation kit. + + Added the Demo/Drivers directory to hold code that is common to multiple + demo application projects. + + Included some minor bug fixes in the uIP 1.0 code. + + Added an lwIP demo for the STR9 - thanks ST for assistance. + + Updated the AVR32 port to ensure correct behaviour with full compiler + optimisation. + + Included binaries for OpenOCD FTDI and parallel port interfaces. + +Changes between V4.4.0 and V4.3.1 released July 31, 2007 + + + Added AVR32 UC3B demo application. + + Updated AVR32 UC3A port and demo applications. + + Added IAR lwIP demo for AVR32 UC3A. + + Updated listGET_OWNER_OF_NEXT_ENTRY() to assist compiler optimisation + (thanks Niu Yong for making the suggestion). + + Added xTaskGetSchedulerState() API function. + + BUG FIX: Corrected behaviour when tasks that are blocked indefinitely + have their block time adjusted (within xQueueSend() and xQueueReceive()), + and are the subject of a call the vTaskResume() when they are not + actually in the Suspended state (thanks Dan Searles for reporting the + issues). + + +Changes between V4.3.0 and V4.3.1 released June 11, 2007 + + + Added STMicroelectronics STM32 Cortex-M3 demo application. + + Updated ustdlib.c for the GCC LM3S6965 demo. + +Changes between V4.2.1 and V4.3.0 released June 5, 2007 + + + Introduced configKERNEL_INTERRUPT_PRIORITY to the IAR Cortex-M3, PIC24 + and dsPIC ports. See the LM3S6965 and PIC24 demo application + documentation pages for more information. + + Updated the PIC24 and dsPIC demos to build with V3.0 of the PIC30 GCC + tools, and changed the demo applications. + + Added demos for the new Ethernet and CAN enabled Luminary Micro Stellaris + microcontrollers. + + Corrected bug in uIP the demos that prevented frames of approximately 1480 + bytes and over from being transmitted. + + Included the LPC2368/uIP/Rowley demo into the main FreeRTOS.org + download. + + Update to WizC PIC18 port to permit its use with version 14 of the + compiler. Thanks Marcel! + +Changes between V4.2.1 and V4.2.0 released April 2, 2007 + + + Added AVR32 AT32UC3A ports for GCC and IAR. + + Added -fomit-frame-pointer option to lwIP SAM7X demo makefile. + + Moved location of call to LCD_Init() in STR9 demo to ensure it is only + called after the scheduler has been started. + +Changes between V4.1.3 and V4.2.0 released February 8, 2007 + + + Changes to both task.c and queue.c as a result of testing performed on + the SafeRTOS code base. + + Added Cortex-M3 LM3S811 demos for GCC and IAR tools. + +Changes between V4.1.2 and V4.1.3 released November 19, 2006 + + + Added STR750 ARM7 port using the Raisonance RIDE/GCC tools. + + Added -fomit-frame-pointer option to Rowley ARM7 demos as work around + to GCC bug at some optimisation levels. + + Altered the way the heap is defined in the LM3S811 Keil demo to prevent + the RAM usage from counting toward the code size limit calculation. + + CO-ROUTINE BUG FIX: Removed the call to prvIsQueueEmpty from within + xQueueCRReceive as it exited with interrupts enabled. Thanks Paul Katz. + + Tasks that block on events with a timeout of portMAX_DELAY are now + blocked indefinitely if configINCLUDE_vTaskSuspend is defined. + Previously portMAX_DELAY was just the longest block time possible. This + is still the case if configINCLUDE_vTaskSuspend is not defined. + + Minor changes to some demo application files. + +Changes between V4.1.1 and V4.1.2 released October 21, 2006 + + + Added 16bit PIC ports and demos. + + Added STR750 port and demo. + + +Changes between V4.1.0 and V4.1.1 released September 24, 2006 + + + Added the Luminary Micro Stellaris LM3S811 demo application. + +Changes between V4.0.5 and V4.1.0 released August 28, 2006 + + + Prior to V4.1.0, under certain documented circumstances, it was possible + for xQueueSend() and xQueueReceive() to return without having completed + and without their block time expiring. The block time effectively + stated a maximum block time, and the return value of the function needed + to be checked to determine the reason for returning. This is no longer + the case as the functions will only return once the block time has + expired or they are able to complete their operation. It is therefore no + longer necessary to wrap calls within loops. + + Changed the critical section handling in the IAR AVR port to correct the + behaviour when used with later compiler versions. + + Added the LPC2138 CrossWorks demo into the zip file. Previously this was + only available as a separate download. + + Modified the AVR demo applications to demonstrate the use of co-routines. + +Changes between V4.0.4 and V4.0.5 released August 13, 2006 + + + Introduced API function xTaskResumeFromISR(). Same functionality as + xTaskResume(), but can be called from within an interrupt service routine. + + Optimised vListInsert() in the case when the wake time is the maximum + tick count value. + + Bug fix: The 'value' of the event list item is updated when the priority + of a task is changed. Previously only the priority of the TCB itself was + changed. + + vTaskPrioritySet() and vTaskResume() no longer use the event list item. + This has not been necessary since V4.0.1 when the xMissedYield handling + was added. + + Lowered the PCLK setting on the ARM9 STR9 demo from 96MHz to 48MHz. + + When ending the scheduler - do not try to attempt a context switch when + deleting the current task. + + SAM7X EMAC drivers: Corrected the Rx frame length mask when obtaining + the length from the rx descriptor. + + +Changes between V4.0.3 and V4.0.4 released June 22, 2006 + + + Added a port and demo application for the STR9 ARM9 based processors from + ST. + + Slight optimisation to the vTaskPrioritySet() function. + + Included the latest uIP version (1.0) in the demo/common/ethernet + directory. + +Changes between V4.0.2 and V4.0.3 released June 7, 2006 + + + Added a port and demo application for the Cortex-M3 target using the IAR + development tools. + + The ARM Cortex-m3 Rowley projects have been updated to use V1.6 of the + CrossStudio tools. + + The heap size defined for the lwIP Rowley demo has been reduced so that + the project will link correctly when using the command line GCC tools + also. The makefile has also been modified to allow debugging. + + The lwIP Rowley demo not includes a 'kernel aware' debug window. + + The uIP Rowley project has been updated to build with V1.6 of CrossWorks. + + The second set of tasks in the blockQ demo were created the wrong way + around (inconsistent to the description in the file). This has been + corrected. + +Changes between V4.0.1 and V4.0.2 released May 28, 2006 + + + Port and demo application added for the Tern Ethernet Engine controller. + + Port and demo application added for MC9S12 using GCC, thanks to + Jefferson "imajeff" Smith. + + The function vTaskList() now suspends the scheduler rather than disabling + interrupts during the creation of the task list. + + Allow a task to delete itself by passing in its own handle. Previously + this could only be done by passing in NULL. + + Corrected the value passed to the WDG_PeriodValueConfig() library + function in the STR71x demo. + + The tick hook function is now called only within a tick isr. Previously + it was also called when the tick function was called during the scheduler + unlocking process. + + The EMAC driver in the SAM7X lwIP demo has been made more robust as per + the thread: http://sourceforge.net/forum/message.php?msg_id=3714405 + + In the PC ports: Add function prvSetTickFrequencyDefault() to set the + DOS tick back to its proper value when the scheduler exits. Thanks + Raynald! + + In the Borland x86 ports there was a mistake in the portFIRST_CONTEXT + macro where the BP register was not popped from the stack correctly. The + BP value would never get used so this did not cause a problem, but it has + been corrected all the same. + + +Changes between V4.0.0 and V4.0.1 released April 7 2006 + + + Improved the ARM CORTEX M3 ports so they now only have to service + pendSV interrupts. + + Added a Luminary Micro port and demo for use with Rowley CrossWorks. + + Added the xMissedYield handling to tasks.c. + +Changes between V3.2.4 and V4.0.0 + + Major changes: + + + Added new RTOS port for Luminary Micros ARM CORTEX M3 microcontrollers. + + Added new co-routine functionality. + + Other kernel changes: + + + An optional tick hook call is now included in the tick function. + + Introduced the xMiniListItem structure and removed the list pxHead + member in order to reduce RAM usage. + + Added the following definitions to the FreeRTOSConfig.h file included + with every port: + configUSE_TICK_HOOK + configUSE_CO_ROUTINES + configMAX_CO_ROUTINE_PRIORITIES + + The volatile qualification has been changed on the list members to allow + the task.c code to be tidied up a bit. + + The scheduler can now be started even if no tasks have been created! + This is to allow co-routines to run when there are no tasks. + + A task being woken by an event will now preempt the currently running task + even if its priority is only equal to the currently running task. + + Port and demo application changes: + + + Updated the WinAVR demo to compile with the latest version of WinAVR + with no warnings generated. + + Changed the WinAVR makefile to make chars signed - needed for the + co-routine code if BaseType_t is set to char. + + Added new demo application file crflash.c. This demonstrates co-routine + functionality including passing data between co-routines. + + Added new demo application file crhook.c. This demonstrates co-routine + and tick hook functionality including passing data between and ISR and + a co-routine. + + Some NOP's were missing following stmdb{}^ instructions in various ARM7 + ports. These have been added. + + Updated the Open Watcom PC demo project to include the crflash and crhook + demo co-routines as an example of their use. + + Updated the H8S demo to compile with the latest version of GCC. + + Updated the SAM7X EMAC drivers to take into account the hardware errata + regarding lost packets. + + Changed the default MAC address used by some WEB server demos as the + original addresses used was not liked by some routers. + + Modified the SAM7X/IAR startup code slightly to prevent it hanging on + some systems when the code is executed using a j-link debugger. The + j-link macro file configures the PLL before the code executes so + attempting to configure it again in the startup code was causing a + problem for some user. Now a check is performed first to see if the + PLL is already set up. + + GCC port now contain all assembler code in a single asm block rather than + individual blocks as before. + + GCC LPC2000 code now explicitly uses R0 rather than letting the assembler + choose the register to use as a temporary register during the context + switch. + + Added portNOP() macro. + + The compare match load value on LPC2000 ports now has 1 added to correct + the value used. + + The minimal stack depth has been increased slightly on the WIZC PIC18 + port. + +Changes between V3.2.3 and V3.2.4 + + + Modified the GCC ARM7 port layer to allow use with GCC V4.0.0 and above. + Many thanks to Glen Biagioni for the provided update. + + Added a new Microblaze port and demo application. + + Modified the SAM7X EMAC demo to default to use the MII interface rather + than the RMII interface. + + Modified the startup sequence of the SAM7X demo slightly to allow the + EMAC longer to auto negotiate. + +Changes between V3.2.2 and V3.2.3 + + + Added MII interface support to the SAM7X EMAC peripheral driver. + Previously versions worked with the RMII interface only. + + Added command line GCC support to the SAM7X lwIP demo. Previously the + project could only be built using the CrossWorks IDE. Modifications to + this end include the addition of a standard makefile and linker script to + the download, and some adjustments to the stacks allocated to each task. + + Changed the page returned by the lwIP WEB server demo to display the + task status table rather than the TCP/IP statistics. + + Corrected the capitalisation of some header file includes and makefile + dependencies to facilitate use on Linux host computers. + + The various LPC2000 ports had a mistake in the timer setup where the + prescale value was written to T0_PC instead of T0_PR. This would have + no effect unless a prescale value was actually required. This has been + corrected. + +Changes between V3.2.1 and V3.2.2 - Released 23 September, 2005 + + + Added an IAR port for the Philips LPC2129 + + The Atmel ARM7 IAR demo project files are now saved in the IAR Embedded + Workbench V4.30a format. + + Updated the J-Link macro file included with the SAM7X uIP demo project + to allow the demo board to be reset over the J-Link. + +Changes between V3.2.0 and V3.2.1 - Released 1 September, 2005 + + + Added lwIP demo for AT91SAM7X using Rowley tools. + + Added uIP demo for AT91SAM7X using IAR tools. + + Added function xTaskGetCurrentTaskHandle(). + + Renamed events.h to mevents.h to prevent it conflicting with the events.h + generated automatically by the HCS12 processor expert utility. events.h + is only used by the PC demo application. + + Both PIC18 ports now initialise the TBLPTRU to 0 as this is the value + expected by the compiler, and the compilers do not write to this + register. + + The HCS12 banked model demo now creates the 'suicide' tasks immediately + prior to starting the scheduler. These tasks should be the last tasks to + get started in order for the test to function correctly. + +Changes between V3.1.1 and V3.2.0 - Released 29 June, 2005 + + V3.2.0 introduces two new MSP430 ports and corrects a minor kernel + issues. Thanks to Ares.qi for his input. + + + Added two MSP430 ports that use the Rowley CrossWorks development tools. + One port just mirrors the existing GCC port. The other port was provided + by Milos Prokic. Thanks! + + V3.2.0 corrects the behavior when vTaskPrioritySet() or vTaskResume() + are called while the scheduler is locked (by a call to + vTaskSuspendAll()). When this is done the subject task now starts to + execute immediately when the scheduler is unlocked if it has the highest + priority that is ready to run. Previously there was a possibility that + the task would not run until the next RTOS tick or call to portYIELD(). + + Another similar small correction ensures that in the case where more than + one task is blocked on a semaphore or queue, the task with the highest + priority is guaranteed to be unblocked first. + + Added a couple of more test tasks to the PC demo which cover the points + above. + +Changes between V3.1.0 and V3.1.1 - Released 21st June, 2005 + + This release updates the HCS12 port. The common kernel code + remains unchanged. + + + Updated the HCS12 port to support banking and introduced a demo + application for the MC9S12DP256. The new demo application is + located in the Demo/HCS12_CodeWarrior_banked directory. + + The name of the directory containing the MC9S12F32 demo application + has been changed to Demo/HCS12_CodeWarrior_small (as in 'small' + memory model). + + MC9S12F32 demo updated slightly to use the PLL. The CPU speed for the + demo application is now 24MHz. Previously it was 8MHz. + + The demo application file Demo/Common/Minimal/death.c has a slight + alteration to prevent it using floating point variables. + + +Changes between V3.0.0 and V3.1.0 - Released 11th June, 2005 + + + Added new ports for ST Microsystems STR71x, and Freescale HCS12 + microcontrollers. Currently the HCS12 port is limited to the small + memory model. Large memory models will be supported in the next + release. + + PIC18 wizC port updated. Thanks to Marcel van Lieshout for his + continuing contribution. + + The accuracy of the AVR port timer setup has been improved. Thanks to + Thomas Krutmann for this contribution. + + Added a new conditional compilation macro configIDLE_SHOULD_YIELD. + See the WEB documentation for details. + + Updated the CrossWorks uIP demo to build with V1.4 of CrossWorks. + + Slight modification to the SAM7 release build configuration to correct + an include path definition. + + Updated the MPLAB PIC18 documentation to provide extra details on linker + file configuration. + +Changes between V3.0.0 and V2.6.1 - Released 23rd April, 2005 + + V3.0.0 includes many enhancements, so this history list is broken into + subsections as follows: + + API changes + New ports + Directory name changes + Kernel and miscellaneous changes changes + + - API changes + + + Each port now defines BaseType_t as the data type that is most + efficient for that architecture. The type BaseType_t is used + extensively in API calls necessitating the following changes to the + FreeRTOS API function prototypes. + + See the "New for V3.0.0" section of the FreeRTOS online + documentation for full details of API changes. + + - New ports + + + The AT91FR40008 ARM7 port contributed by John Feller is now included + in the download (thanks John!). + + The PIC18 port for the wizC/fedC compiler contributed by Marcel van + Lieshout is now included in the download (thanks Marcel!). + + The IAR port for the AVR microcontroller has been upgraded to V3.0.0 + and is now a supported port. + + - Directory name changes + + For consistency, and to allow integration of the new ports, the + following directory names have been changed. + + + The source/portable/GCC/ARM7 directory has been renamed + source/portable/GCC/ARM7_LPC2000 so it is compatible with the naming + of other GCC ARM7 ports. + + The Demo/PIC directory has been renamed Demo/PIC18_MPLAB to + accommodate the wizC/fedC PIC port. + + The demo applications for the two AVR ports no longer share the same + directory. The WinAVR demo is in the Demo/AVR_ATMega323_WinAVR + directory and the IAR port in the Demo/AVR_ATMega323_IAR directory. + + + - Kernel and miscellaneous changes changes + + See the "New for V3.0.0" section of the FreeRTOS online + documentation for more information. + + + Previously 'portmacro.h' contained some user editable definitions + relating to the user application, and some fixed definitions relating + specifically to the port being used. The application specific + definitions have been removed from 'portmacro.h' and placed inside a + new header file called 'FreeRTOSConfig.h'. 'portmacro.h' should now + never be modified by the user. A 'FreeRTOSConfig.h' is now included + in each of FreeRTOS/Demo subdirectories - as it's settings relate to + the demo application rather than being specific to the port. + + Introduced configUSE_IDLE_HOOK in idle task. + + The idle task will yield when another idle priority task is ready to + run. Previously the idle task would run to the end of its time slice + regardless. + + The idle task is now created when the scheduler is started. This + requires less stack than the previous scheme where it was created upon + creation of the first application task. + + The function usPortCheckFreeStackSpace() has been renamed + usTaskCheckFreeStackSpace() and moved from the portable layer to + tasks.c. + + Corrected spelling of portMINMAL_STACK_SIZE to portMINIMAL_STACK_SIZE. + + The portheap.c file included with the AVR port has been deleted. The + AVR demo now uses the standard heap1 sample memory allocator. + + The GCC AVR port is now build using the standard make utility. The + batch files used previously have been deleted. This means a recent + version of WinAVR is required in order to create a binary suitable for + source level debugging. + + vTaskStartScheduler() no longer takes the configUSE_PREEMPTION + constant as a parameter. Instead the constant is used directly within + tasks.c and no parameter is required. + + The header file 'FreeRTOS.h' has been created and is used to include + 'projdefs.h', 'FreeRTOSConfig.h' and 'portable.h' in the necessary + order. FreeRTOS.h can now be included in place of these other + headers. + + The header file 'errors.h' has been deleted. The definitions it + contained are now located within 'projdefs.h'. + + pvPortMalloc() now takes a size_t parameter as per the ANSI malloc(). + Previously an unsigned short was used. + + When resuming the scheduler a yield is performed if either a tick has + been missed, or a task is moved from the pending ready list into a + ready list. Previously a yield was not performed on this second + condition. + + In heap1.c an overflow check has been added to ensure the next free + byte variable does not wrap around. + + Introduced the portTASK_FUNCTION() and portTASK_FUNCTION_PROTO() + macros. + + The MPLAB PIC port now saved the TABLAT register in interrupt service + routines. + +Changes between V2.6.0 and V2.6.1 - Released Feb 22, 2005 + + This version adds support for the H8 processor. + + Other changes: + + + tskMAX_TASK_NAME_LEN removed from the task.h header and added to each + individual portmacro.h file as portMAX_TASK_NAME_LEN. This allows RAM + limited ports to allocate fewer characters to the task name. + + AVR port - Replaced the inb() and outb() functions with direct memory + access. This allows the port to be built with the 20050414 build of + WinAVR. + + GCC LPC2106 port - removed the 'static' from the definition of + vNonPreemptiveTick() to allow the demo to link when using the cooperative + scheduler. + + GCC LPC2106 port - Corrected the optimisation options in the batch files + ROM_THUMB.bat, RAM_THUMB.bat, ROM_ARM.bat and RAM_ARM.bat. The lower case + -o is replaced by an uppercase -O. + + Tasks.c - The strcpy call has been removed when copying across the task + name into the TCB. + + Updated the trace visualisation to always be 4 byte aligned so it can be + used on ARM architectures. + + There are now two tracecon executables (that convert the trace file binary + into an ASCII file). One for big endian targets and one for little endian + targets. + + Added ucTasksDeleted variable to prevent vTaskSuspendAll() being called + too often in the idle task. + + SAM7 USB driver - Replaced the duplicated RX_DATA_BK0 in the interrupt + mask with the RX_DATA_BK1. + + +Changes between V2.5.5 and V2.6.0 - Released January 16, 2005 + + + Added the API function vTaskDelayUntil(). The demo app file + Demo/Common/Minimal/flash.c has been updated to demonstrate its use. + + Added INCLUDE_vTaskDelay conditional compilation. + + Changed the name of the Demo/ARM7_AtmelSAM7S64_IAR directory to + Demo/ARM7_AT91SAM7S64_IAR for consistency. + + Modified the AT91SAM7S USB driver to allow descriptors that have + a length that is an exact multiple of the FIFO to be transmitted. + +Changes between V2.5.4 and V2.5.5 - Released January 3, 2005 + + This version adds support for the Atmel SAM7 ARM7 microcontrollers + along with the IAR development tools. + + Other changes: + + + Renamed the Demo/ARM7 directory to Demo/ARM7_LPC2106_GCC. + + Renamed the Demo/ARM7_Keil directory to Demo/ARM7_LPC2129_Keil. + + Modified the Philips ARM7 serial interrupt service routines to only + process one interrupt per call. This seems to enable the ISR to + operate more quickly. + + Removed the 'far' keyword from the Open Watcom portable layer source + files. This allows their use with V1.3 of Open Watcom. + + Minor modifications to the SDCC build files to allow their use under + Linux. Thanks to Frieder Ferlemann for this contribution. + + Small change to sTaskCreate() to allow a context switch even when + pxCreatedTask is NULL. Thanks to Kamil for this contribution. + + inline keyword removed from vTaskSwitchContext() and VTaskIncrementTick() + definitions. + +Changes between V2.5.3 and V2.5.4 - Released Dec 1, 2004 + + This is an important maintenance release. + + The function cTaskResumeAll() has been modified so it can be used safely + prior to the kernel being initialised. This was an issue as + cTaskResumeAll() is called from pvPortMalloc(). Thanks to Daniel Braun + for highlighting this issue. + +Changes between V2.5.2 and V2.5.3 - Released Nov 2, 2004 + + The critical section handling functions have been changed for the GCC ARM7 + port. Some optimisation levels use the stack differently to others. This + means the interrupt flags cannot always be stored on the stack and are + instead now stored in a variable, which is then saved as part of the + tasks context. This allows the GCC ARM7 port to be used at all + optimisation levels - including -Os. + + Other minor changes: + + + MSP430 definition of usCriticalNesting now uses the volatile qualifier. + This is probably not required but added just in case. + +Changes between V2.5.1 and V2.5.2 - Released Oct 26, 2004 + + + Added the Keil ARM7 port. + + Slight modification to comtest.c to make the delay periods more random. + This creates a better test condition. + +Changes between V2.5.0 and V2.5.1 - Released Oct 9, 2004 + + + Added the MSP430 port. + + Extra comments added to the GCC ARM7 port.c and portISR.c files. + + The memory pool allocated within heap_1.c has been placed within a + structure to ensure correct memory alignment on 32bit systems. + + Within the GCC ARM7 serial drivers an extra check is made to ensure + the post to the queue was successful if then attempting immediately + retrieve the posted character. + + Changed the name of the constant portTICKS_PER_MS to portTICK_PERIOD_MS + as the old name was misleading. + + +Changes between V2.4.2 and V2.5.0 - Released Aug 12, 2004 + + The RTOS source code download now includes three separate memory allocation + schemes - so you can choose the most appropriate for your application. + These are found in the Source/Portable/MemMang directory. The demo + application projects have also been updated to demonstrate the new schemes. + See the "Memory Management" page of the API documentation for more details. + + + Added heap_1.c, heap_2.c and heap_3.c in the Source/Portable/MemMang + directory. + + Replaced the portheap.c files for each demo application with one of the + new memory allocation files. + + Updated the portmacro.h file for each demo application to include the + constants required for the new memory allocators: portTOTAL_HEAP_SIZE and + portBYTE_ALIGNMENT. + + Added a new test to the ARM7 demo application that tests the operation + of the heap_2 memory allocator. + + +Changes between V2.4.1 and V2.4.2 - Released July 14, 2004 + + + The ARM7 port now supports THUMB mode. + + Modification to the ARM7 demo application serial port driver. + +Changes between V2.4.0 and V2.4.1 - Released July 2, 2004 + + + Rationalised the ARM7 port version of portEXIT_CRITICAL() - + improvements provided by Bill Knight. + + Made demo serial driver more complete and robust. + + +Changes between V2.4.0 and V2.3.1 - Released June 30, 2004 + + + Added the first ARM7 port - thanks to Bill Knight for the assistance + provided. + + Added extra files to the Demo/Common/Minimal directory. These are + equivalent to their Demo/Common/Full counterparts but with the + calls to the functions defined in print.c removed. + + Added TABLAT to the list of registers saved as part of a PIC18 context. + +Changes between V2.3.0 and V2.3.1 - Released June 25, 2004 + + + Changed the way the vector table is defined to be more portable. + + Corrected the definitions of SPH and SPL in portmacro.s90. + The previous definitions prevented V2.3.0 operating if the iom323.h + header file was included in portmacro.s90. + +Changes between V2.2.0 and V2.3.0 - Released June 19, 2004 + + + Added an AVR port that uses the IAR compiler. + + Explicit use of 'signed' qualifier on plain char types. + + Modified the Open Watcom project files to use 'signed' as the + default char type. + + Changed odd calculation of initial pxTopOfStack value when + portSTACK_GROWTH < 0. + + Added inline qualifier to context switch functions within task.c. + Ports that do not support the (non ANSI) inline keyword have the + inline #define'd away in their respective portmacro.h files. + +Changes between V2.1.1 and V2.2.0 - Released May 18, 2004 + + + Added Cygnal 8051 port. + + PCLATU and PCLATH are now saved as part of the PIC18 context. This + allows function pointers to be used within tasks. Thanks to Javier + Espeche for the enhancement. + + Minor changes to demo application files to reduce stack usage. + + Minor changes to prevent compiler warnings when compiling the new port. + +Changes between V2.1.0 and V2.1.1 - Released March 12, 2004 + + + Bug fix - pxCurrentTCB is now initialised before the call to + prvInitialiseTaskLists(). Previously pxCurrentTCB could be accessed + while null during the initialisation sequence. Thanks to Giuseppe + Franco for the correction. + +Changes between V2.0.0 and V2.1.0 - Released Feb 29, 2004 + + V2.1.0 has significant reworks that greatly reduce the amount of time + the kernel has interrupts disabled. The first section of modifications + listed here must be taken into account by users. The second section + are related to the kernel implementation and as such are transparent. + + Section1 : + + + The typedef TickType_t has been introduced. All delay times should + now use a variable of type TickType_t in place of the unsigned long's + used previously. API function prototypes have been updated + appropriately. + + The configuration macro USE_16_BIT_TICKS has been introduced. If set + to 1 TickType_t is defined as an unsigned short. If set to 0 + TickType_t is defined as an unsigned long. See the configuration + section of the API documentation for more details. + + The configuration macro INCLUDE_vTaskSuspendAll is now obsolete. + + vTaskResumeAll() has been renamed cTaskResumeAll() as it now returns a + value (see the API documentation). + + ulTaskGetTickCount() has been renamed xTaskGetTickCount() as the type + it returns now depends on the USE_16_BIT_TICKS definition. + + cQueueReceive() must now >never< be used from within an ISR. Use the new + cQueueReceiveFromISR() function instead. + + Section 2: + + + A mechanism has been introduced that allows a queue to be accessed by + a task and ISR simultaneously. + + A "pending ready" queue has been introduced that enables interrupts to + be processed when the scheduler is suspended. + + The list implementation has been improved to provide faster item + removal. + + The scheduler now makes use of the scheduler suspend mechanism in places + where previously interrupts were disabled. + +Changes between V1.2.6 and V2.0.0 - Released Jan 31, 2004 + + + Introduced new API functions: + vTaskPriorityGet () + vTaskPrioritySet () + vTaskSuspend () + vTaskResume () + vTaskSuspendAll () + vTaskResumeAll () + + Added conditional compilation options that allow the components of the + kernel that are unused by an application to be excluded from the build. + See the Configuration section on the WEB site for more information (on + the API pages). The macros have been added to each portmacro.h file ( + sometimes called prtmacro.h). + + Rearranged tasks.c. + + Added demo application file dynamic.c. + + Updated the PC demo application to make use of dynamic.c. + + Updated the documentation contained in the kernel header files. + + Creating a task now causes a context switch if the task being created + has a higher priority than the calling task - assuming the kernel is + running. + + vTaskDelete() now only causes a context switch if the calling task is + the task being deleted. + +Changes between V1.2.5 and V1.2.6 - Released December 31, 2003 + + Barring the change to the interrupt vector (PIC port) these are minor + enhancements. + + + The interrupt vector used for the PIC master ISR has been changed from + 0x18 to 0x08 - where it should have always been. The incorrect address + still works but probably executes a number of NOP's before getting to the + ISR. + + Changed the baud rate used by the AVR demo application to 38400. This + has an error percentage of less than one percent with an 8MHz clock. + + Raised the priority of the Rx task in demo\full\comtest.c. This only + affects the Flashlite and PC ports. This was done to prevent the Rx + buffer becoming full. + + Reverted the Flashlite COM port driver back so it does not use the DMA. + The DMA appears to miss characters under stress. The Borland Flashlite + port was also calculating a register value incorrectly resulting in the + wrong DMA source address being used. The same code worked fine when + compiling with Open Watcom. Other minor enhancements were made to the + interrupt handling. + + Modified the PIC serial Rx ISR to check for and clear overrun errors. + Overrun errors seem to prevent any further characters being received. + + The PIC demo projects now have some optimisation switched on. + + +Changes between V1.2.4 and V1.2.5 + + Small fix made to the PIC specific port.c file described below. + + + Introduced portGLOBAL_INTERRUPT_FLAG definition to test the global + interrupt flag setting. Using the two bits defined within + portINITAL_INTERRUPT_STATE was causing the w register to get clobbered + before the test was performed. + +Changes between V1.2.3 and V1.2.4 + + V1.2.4 contains a release version of the PIC18 port. + An optional exception has been included with the GPL. See the licensing + section of www.FreeRTOS.org for details. + + + The function xPortInitMinimal() has been renamed to + xSerialPortInitMinimal() and the function xPortInit() has been renamed + to xSerialPortInit(). + + The function sSerialPutChar() has been renamed cSerialPutChar() and + the function return type chaned to portCHAR. + + The integer and flop tasks now include calls to tskYIELD(), allowing + them to be used with the cooperative scheduler. + + All the demo applications now use the integer and comtest tasks when the + cooperative scheduler is being used. Previously they were only used with + the preemptive scheduler. + + Minor changes made to operation of minimal versions of comtest.c and + integer.c. + + The ATMega port definition of portCPU_CLOSK_HZ definition changed to + 8MHz base 10, previously it base 16. + + + +Changes between V1.2.2a and V1.2.3 + + The only change of any significance is to the license, which has changed + from the Open Software License to the GNU GPL. + + The zip file also contains a pre-release version of the PIC18 port. This + has not yet completed testing and as such does not constitute part of the + V1.2.3 release. It is still however covered by the GNU GPL. + + There are minor source code changes to accommodate the PIC C compiler. + These mainly involve more explicit casting. + + + sTaskCreate() has been modified slightly to make use of the + portSTACK_GROWTH macro. This is required for the PIC port where the + stack grows in the opposite direction to the other existing ports. + + prvCheckTasksWaitingTermination() has been modified slightly to bring + the decrementing of usCurrentNumberOfTasks within the critical section, + where it should have been since the creation of an eight bit port. + +Changes between V1.2.2 and V1.2.2a + + The makefile and buildcoff.bat files included with the AVR demo application + have been modified for use with the September 2003 build of WinAVR. No + source files have changed. + +Changes between V1.2.1 and V1.2.2 + + There are only minor changes here to allow the PC and Flashlite 186 ports + to use the Borland V4.52 compiler, as supplied with the Flashlite 186 + development kit. + + + Introduced a BCC directory under source\portable. This contains all the + files specific to the Borland compiler port. + + Corrected the macro naming of portMS_PER_TICK to portTICKS_PER_MS. + + Modified comtest.c to increase the rate at which the string is + transmitted and received on the serial port. The Flashlite 186 demo + app baud rate has also been increased. + + The values of the constants used in both integer.c files have been + increased to force the Borland compiler to use 32 bit values. The + Borland optimiser placed the previous values in 16 bit registers, and in + So doing invalidated the test. + +Changes between V1.2.0 and V1.2.1 + + This version includes some minor changes to the list implementation aimed + at improving the context switch time - with is now approximately 10% faster. + Changes include the removal of some null pointer assignment checks. These + were redundant where the scheduler uses the list functions, but means any + user application choosing to use the same list functions must now check + that no NULL pointers are passed as a parameter. + + The Flashlite 186 serial port driver has also been modified to use a DMA + channel for transmissions. The serial driver is fully functional but still + under development. Flashlite users may prefer to use V1.2.0 for now. + + Details: + + + Changed the baud rate for the ATMega323 serial test from 19200 to 57600. + + Use vSerialPutString() instead of single character puts in + Demo\Full\Comtest.c. This allows the use of the flashlite DMA serial + driver. Also the check variable only stops incrementing after two + consecutive failures. + + semtest.c creates four tasks, two of which operate at the idle priority. + The tasks that operate at the idle priority now use a lower expected + count than those running at a higher priority. This prevents the low + priority tasks from signalling an error because they have not been + scheduled enough time for each of them to count the shared variable to + the higher original value. + + The flashlite 186 serial driver now uses a DMA channel for transmissions. + + Removed the volatile modifier from the list function parameters. This was + only ever included to prevent compiler warnings. Now warnings are + removed by casting parameters where the calls are made. + + prvListGetOwnerOfNextEntry() and prvListGetOwnerOfHeadEntry() have been + removed from list.c and added as macros in list.h. + + usNumberOfItems has been added to the list structure. This removes the + need for a pointer comparison when checking if a list is empty, and so + is slightly faster. + + Removed the NULL check in vListRemove(). This makes the call faster but + necessitates any application code utilising the list implementation to + ensure NULL pointers are not passed. + + Renamed portTICKS_PER_MS definition to portMS_PER_TICK (milli seconds + per tick). This is what it always should have been. + +Changes between V1.01 and V1.2.0 + + The majority of these changes were made to accommodate the 8bit AVR port. + The scheduler workings have not changed, but some of the data types used + have been made more friendly to an eight bit environment. + + Details: + + + Changed the version numbering format. + + Added AVR port. + + Split the directory demo\common into demo\common\minimal and + demo\common\full. The files in the full directory are for systems with + a display (currently PC and Flashlite 186 demo's). The files in the + minimal directory are for systems with limited RAM and no display + (currently MegaAVR). + + Minor changes to demo application function prototypes to make more use + of 8bit data types. + + Within the scheduler itself the following functions have slightly + modified declarations to make use of 8bit data types where possible: + xQueueCreate(), + sQueueReceive(), + sQUeueReceive(), + usQueueMessageWaiting(), + sQueueSendFromISR(), + sSemaphoreTake(), + sSemaphoreGive(), + sSemaphoreGiveFromISR(), + sTaskCreate(), + sTaskMoveFromEventList(). + + Where the return type has changed the function name has also changed in + accordance with the naming convention. For example + usQueueMessageWaiting() has become ucQueueMessageWaiting(). + + The definition tskMAX_PRIORITIES has been moved from task.h to + portmacro.h and renamed portMAX_PRIORITIES. This allows different + ports to allocate a different maximum number of priorities. + + By default the trace facility is off, previously USE_TRACE_FACILITY + was defined. + + comtest.c now uses a psuedo random delay between sends. This allows for + better testing as the interrupts do not arrive at regular intervals. + + Minor change to the Flashlite serial port driver. The driver is written + to demonstrate the scheduler and is not written to be efficient. + + + +Changes between V1.00 and V1.01 + + These changes improve the ports. The scheduler itself has not changed. + + Improved context switch mechanism used when performing a context + switch from an ISR (both the tick ISR and the serial comms ISR's within + the demo application). The new mechanism is faster and uses less stack. + + The assembler file portasm.asm has been replaced by a header file + portasm.h. This includes a few assembler macro definitions. + + All saving and restoring of registers onto/off of the stack is now handled + by the compiler. This means the initial stack setup for a task has to + mimic the stack used by the compiler, which is different for debug and + release builds. + + Slightly changed the operation of the demo application, details below. + + Details: + + + portSWITCH_CONTEXT() replaced by vPortFirstContext(). + + pxPortInitialiseStack() modified to replicate the stack used by the + compiler. + + portasm.asm file removed. + + portasm.h introduced. This contains macro definitions for + portSWITCH_CONTEXT() and portFIRST_CONTEXT(). + + Context switch from ISR now uses the compiler generated interrupt + mechanism. This is done simply by calling portSWITCH_CONTEXT and leaving + the save/restore to compiler generated code. + + Calls to taskYIELD() during ISR's have been replaced by calling the + simpler and faster portSWITCH_CONTEXT(). + + The Flashlite 186 port now uses 186 instruction set (used to use 80x86 + instructions only). + + The blocking queue tasks within the demo application did not operate + quite as described. This has been corrected. + + The priority of the comtest Rx task within the demo application has been + lowered. Received characters are now processed (read from the queue) at + the idle priority, allowing low priority tasks to run evenly at times of + a high communications overhead. + + Prevent the call to kbhit() in main.c for debug builds as the debugger + seems to have problems stepping over the call. This if for the PC port + only. + + + diff --git a/FreeRTOS/Source/include/mpu_prototypes.h b/FreeRTOS/Source/include/mpu_prototypes.h index f0b3337ae..766197ab1 100644 --- a/FreeRTOS/Source/include/mpu_prototypes.h +++ b/FreeRTOS/Source/include/mpu_prototypes.h @@ -69,7 +69,7 @@ void * MPU_pvTaskGetThreadLocalStoragePointer( TaskHandle_t xTaskToQuery, BaseTy BaseType_t MPU_xTaskCallApplicationTaskHook( TaskHandle_t xTask, void *pvParameter ) FREERTOS_SYSTEM_CALL; TaskHandle_t MPU_xTaskGetIdleTaskHandle( void ) FREERTOS_SYSTEM_CALL; UBaseType_t MPU_uxTaskGetSystemState( TaskStatus_t * const pxTaskStatusArray, const UBaseType_t uxArraySize, uint32_t * const pulTotalRunTime ) FREERTOS_SYSTEM_CALL; -TickType_t MPU_xTaskGetIdleRunTimeCounter( void ) FREERTOS_SYSTEM_CALL; +uint32_t MPU_ulTaskGetIdleRunTimeCounter( void ) FREERTOS_SYSTEM_CALL; void MPU_vTaskList( char * pcWriteBuffer ) FREERTOS_SYSTEM_CALL; void MPU_vTaskGetRunTimeStats( char *pcWriteBuffer ) FREERTOS_SYSTEM_CALL; BaseType_t MPU_xTaskGenericNotify( TaskHandle_t xTaskToNotify, uint32_t ulValue, eNotifyAction eAction, uint32_t *pulPreviousNotificationValue ) FREERTOS_SYSTEM_CALL; @@ -82,6 +82,7 @@ void MPU_vTaskSetTimeOutState( TimeOut_t * const pxTimeOut ) FREERTOS_SYSTEM_CAL BaseType_t MPU_xTaskCheckForTimeOut( TimeOut_t * const pxTimeOut, TickType_t * const pxTicksToWait ) FREERTOS_SYSTEM_CALL; void MPU_vTaskMissedYield( void ) FREERTOS_SYSTEM_CALL; BaseType_t MPU_xTaskGetSchedulerState( void ) FREERTOS_SYSTEM_CALL; +BaseType_t MPU_xTaskCatchUpTicks( TickType_t xTicksToCatchUp ) FREERTOS_SYSTEM_CALL; /* MPU versions of queue.h API functions. */ BaseType_t MPU_xQueueGenericSend( QueueHandle_t xQueue, const void * const pvItemToQueue, TickType_t xTicksToWait, const BaseType_t xCopyPosition ) FREERTOS_SYSTEM_CALL; diff --git a/FreeRTOS/Source/include/mpu_wrappers.h b/FreeRTOS/Source/include/mpu_wrappers.h index 56d9c7ef4..2c0ee7549 100644 --- a/FreeRTOS/Source/include/mpu_wrappers.h +++ b/FreeRTOS/Source/include/mpu_wrappers.h @@ -77,11 +77,12 @@ only for ports that are using the MPU. */ #define uxTaskGetSystemState MPU_uxTaskGetSystemState #define vTaskList MPU_vTaskList #define vTaskGetRunTimeStats MPU_vTaskGetRunTimeStats - #define xTaskGetIdleRunTimeCounter MPU_xTaskGetIdleRunTimeCounter + #define ulTaskGetIdleRunTimeCounter MPU_ulTaskGetIdleRunTimeCounter #define xTaskGenericNotify MPU_xTaskGenericNotify #define xTaskNotifyWait MPU_xTaskNotifyWait #define ulTaskNotifyTake MPU_ulTaskNotifyTake #define xTaskNotifyStateClear MPU_xTaskNotifyStateClear + #define xTaskCatchUpTicks MPU_xTaskCatchUpTicks #define xTaskGetCurrentTaskHandle MPU_xTaskGetCurrentTaskHandle #define vTaskSetTimeOutState MPU_vTaskSetTimeOutState diff --git a/FreeRTOS/Source/include/task.h b/FreeRTOS/Source/include/task.h index 3a5772652..b4e246fb9 100644 --- a/FreeRTOS/Source/include/task.h +++ b/FreeRTOS/Source/include/task.h @@ -1738,7 +1738,7 @@ void vTaskGetRunTimeStats( char *pcWriteBuffer ) PRIVILEGED_FUNCTION; /*lint !e9 /** * task. h -* 
TickType_t xTaskGetIdleRunTimeCounter( void );
+* 
uint32_t ulTaskGetIdleRunTimeCounter( void );
* * configGENERATE_RUN_TIME_STATS and configUSE_STATS_FORMATTING_FUNCTIONS * must both be defined as 1 for this function to be available. The application @@ -1753,7 +1753,7 @@ void vTaskGetRunTimeStats( char *pcWriteBuffer ) PRIVILEGED_FUNCTION; /*lint !e9 * of the accumulated time value depends on the frequency of the timer * configured by the portCONFIGURE_TIMER_FOR_RUN_TIME_STATS() macro. * While uxTaskGetSystemState() and vTaskGetRunTimeStats() writes the total -* execution time of each task into a buffer, xTaskGetIdleRunTimeCounter() +* execution time of each task into a buffer, ulTaskGetIdleRunTimeCounter() * returns the total execution time of just the idle task. * * @return The total run time of the idle task. This is the amount of time the @@ -1761,10 +1761,10 @@ void vTaskGetRunTimeStats( char *pcWriteBuffer ) PRIVILEGED_FUNCTION; /*lint !e9 * frequency configured using the portCONFIGURE_TIMER_FOR_RUN_TIME_STATS() and * portGET_RUN_TIME_COUNTER_VALUE() macros. * -* \defgroup xTaskGetIdleRunTimeCounter xTaskGetIdleRunTimeCounter +* \defgroup ulTaskGetIdleRunTimeCounter ulTaskGetIdleRunTimeCounter * \ingroup TaskUtils */ -TickType_t xTaskGetIdleRunTimeCounter( void ) PRIVILEGED_FUNCTION; +uint32_t ulTaskGetIdleRunTimeCounter( void ) PRIVILEGED_FUNCTION; /** * task. h @@ -2383,6 +2383,19 @@ void vTaskSetTaskNumber( TaskHandle_t xTask, const UBaseType_t uxHandle ) PRIVIL */ void vTaskStepTick( const TickType_t xTicksToJump ) PRIVILEGED_FUNCTION; +/* Correct the tick count value after the application code has held +interrupts disabled for an extended period. xTicksToCatchUp is the number +of tick interrupts that have been missed due to interrupts being disabled. +Its value is not computed automatically, so must be computed by the +application writer. + +This function is similar to vTaskStepTick(), however, unlike +vTaskStepTick(), xTaskCatchUpTicks() may move the tick count forward past a +time at which a task should be removed from the blocked state. That means +tasks may have to be removed from the blocked state as the tick count is +moved. */ +BaseType_t xTaskCatchUpTicks( TickType_t xTicksToCatchUp ) PRIVILEGED_FUNCTION; + /* * Only available when configUSE_TICKLESS_IDLE is set to 1. * Provided for use within portSUPPRESS_TICKS_AND_SLEEP() to allow the port diff --git a/FreeRTOS/Source/portable/CCS/ARM_CM3/port.c b/FreeRTOS/Source/portable/CCS/ARM_CM3/port.c index a159ab28f..57bc6d128 100644 --- a/FreeRTOS/Source/portable/CCS/ARM_CM3/port.c +++ b/FreeRTOS/Source/portable/CCS/ARM_CM3/port.c @@ -505,7 +505,7 @@ void xPortSysTickHandler( void ) vTaskStepTick( ulCompleteTickPeriods ); portNVIC_SYSTICK_LOAD_REG = ulTimerCountsForOneTick - 1UL; - /* Exit with interrpts enabled. */ + /* Exit with interrupts enabled. */ __asm( " cpsie i" ); } } diff --git a/FreeRTOS/Source/portable/CCS/ARM_CM4F/port.c b/FreeRTOS/Source/portable/CCS/ARM_CM4F/port.c index 452aafc25..fb0f72774 100644 --- a/FreeRTOS/Source/portable/CCS/ARM_CM4F/port.c +++ b/FreeRTOS/Source/portable/CCS/ARM_CM4F/port.c @@ -528,7 +528,7 @@ void xPortSysTickHandler( void ) vTaskStepTick( ulCompleteTickPeriods ); portNVIC_SYSTICK_LOAD_REG = ulTimerCountsForOneTick - 1UL; - /* Exit with interrpts enabled. */ + /* Exit with interrupts enabled. */ __asm( " cpsie i" ); } } diff --git a/FreeRTOS/Source/portable/GCC/ARM_CM3/port.c b/FreeRTOS/Source/portable/GCC/ARM_CM3/port.c index 762a02a2b..abab6c049 100644 --- a/FreeRTOS/Source/portable/GCC/ARM_CM3/port.c +++ b/FreeRTOS/Source/portable/GCC/ARM_CM3/port.c @@ -602,7 +602,7 @@ void xPortSysTickHandler( void ) vTaskStepTick( ulCompleteTickPeriods ); portNVIC_SYSTICK_LOAD_REG = ulTimerCountsForOneTick - 1UL; - /* Exit with interrpts enabled. */ + /* Exit with interrupts enabled. */ __asm volatile( "cpsie i" ::: "memory" ); } } diff --git a/FreeRTOS/Source/portable/GCC/ARM_CM4F/port.c b/FreeRTOS/Source/portable/GCC/ARM_CM4F/port.c index e84e9bafe..15e28df57 100644 --- a/FreeRTOS/Source/portable/GCC/ARM_CM4F/port.c +++ b/FreeRTOS/Source/portable/GCC/ARM_CM4F/port.c @@ -664,7 +664,7 @@ void xPortSysTickHandler( void ) vTaskStepTick( ulCompleteTickPeriods ); portNVIC_SYSTICK_LOAD_REG = ulTimerCountsForOneTick - 1UL; - /* Exit with interrpts enabled. */ + /* Exit with interrupts enabled. */ __asm volatile( "cpsie i" ::: "memory" ); } } diff --git a/FreeRTOS/Source/portable/GCC/ARM_CM7/r0p1/port.c b/FreeRTOS/Source/portable/GCC/ARM_CM7/r0p1/port.c index 4851012ba..9806a879a 100644 --- a/FreeRTOS/Source/portable/GCC/ARM_CM7/r0p1/port.c +++ b/FreeRTOS/Source/portable/GCC/ARM_CM7/r0p1/port.c @@ -654,7 +654,7 @@ void xPortSysTickHandler( void ) vTaskStepTick( ulCompleteTickPeriods ); portNVIC_SYSTICK_LOAD_REG = ulTimerCountsForOneTick - 1UL; - /* Exit with interrpts enabled. */ + /* Exit with interrupts enabled. */ __asm volatile( "cpsie i" ::: "memory" ); } } diff --git a/FreeRTOS/Source/portable/IAR/ARM_CM3/port.c b/FreeRTOS/Source/portable/IAR/ARM_CM3/port.c index 33303c382..486f61447 100644 --- a/FreeRTOS/Source/portable/IAR/ARM_CM3/port.c +++ b/FreeRTOS/Source/portable/IAR/ARM_CM3/port.c @@ -504,7 +504,7 @@ void xPortSysTickHandler( void ) vTaskStepTick( ulCompleteTickPeriods ); portNVIC_SYSTICK_LOAD_REG = ulTimerCountsForOneTick - 1UL; - /* Exit with interrpts enabled. */ + /* Exit with interrupts enabled. */ __enable_interrupt(); } } diff --git a/FreeRTOS/Source/portable/IAR/ARM_CM4F/port.c b/FreeRTOS/Source/portable/IAR/ARM_CM4F/port.c index cf8904850..2a2b66e66 100644 --- a/FreeRTOS/Source/portable/IAR/ARM_CM4F/port.c +++ b/FreeRTOS/Source/portable/IAR/ARM_CM4F/port.c @@ -541,7 +541,7 @@ void xPortSysTickHandler( void ) vTaskStepTick( ulCompleteTickPeriods ); portNVIC_SYSTICK_LOAD_REG = ulTimerCountsForOneTick - 1UL; - /* Exit with interrpts enabled. */ + /* Exit with interrupts enabled. */ __enable_interrupt(); } } diff --git a/FreeRTOS/Source/portable/IAR/ARM_CM7/r0p1/port.c b/FreeRTOS/Source/portable/IAR/ARM_CM7/r0p1/port.c index 4b3e628d4..9bff8ed7d 100644 --- a/FreeRTOS/Source/portable/IAR/ARM_CM7/r0p1/port.c +++ b/FreeRTOS/Source/portable/IAR/ARM_CM7/r0p1/port.c @@ -529,7 +529,7 @@ void xPortSysTickHandler( void ) vTaskStepTick( ulCompleteTickPeriods ); portNVIC_SYSTICK_LOAD_REG = ulTimerCountsForOneTick - 1UL; - /* Exit with interrpts enabled. */ + /* Exit with interrupts enabled. */ __enable_interrupt(); } } diff --git a/FreeRTOS/Source/portable/MikroC/ARM_CM4F/port.c b/FreeRTOS/Source/portable/MikroC/ARM_CM4F/port.c index 8b38a726e..bd9e1e574 100644 --- a/FreeRTOS/Source/portable/MikroC/ARM_CM4F/port.c +++ b/FreeRTOS/Source/portable/MikroC/ARM_CM4F/port.c @@ -648,7 +648,7 @@ void xPortSysTickHandler( void ) iv IVT_INT_SysTick ics ICS_AUTO vTaskStepTick( ulCompleteTickPeriods ); portNVIC_SYSTICK_LOAD_REG = ulTimerCountsForOneTick - 1UL; - /* Exit with interrpts enabled. */ + /* Exit with interrupts enabled. */ __asm { "cpsie i" }; } } diff --git a/FreeRTOS/Source/portable/RVDS/ARM_CM3/port.c b/FreeRTOS/Source/portable/RVDS/ARM_CM3/port.c index 4a6fc128f..42d48157a 100644 --- a/FreeRTOS/Source/portable/RVDS/ARM_CM3/port.c +++ b/FreeRTOS/Source/portable/RVDS/ARM_CM3/port.c @@ -588,7 +588,7 @@ void xPortSysTickHandler( void ) vTaskStepTick( ulCompleteTickPeriods ); portNVIC_SYSTICK_LOAD_REG = ulTimerCountsForOneTick - 1UL; - /* Exit with interrpts enabled. */ + /* Exit with interrupts enabled. */ __enable_irq(); } } diff --git a/FreeRTOS/Source/portable/RVDS/ARM_CM4F/port.c b/FreeRTOS/Source/portable/RVDS/ARM_CM4F/port.c index c5e47a5bf..d3d42cfc8 100644 --- a/FreeRTOS/Source/portable/RVDS/ARM_CM4F/port.c +++ b/FreeRTOS/Source/portable/RVDS/ARM_CM4F/port.c @@ -678,7 +678,7 @@ void xPortSysTickHandler( void ) vTaskStepTick( ulCompleteTickPeriods ); portNVIC_SYSTICK_LOAD_REG = ulTimerCountsForOneTick - 1UL; - /* Exit with interrpts enabled. */ + /* Exit with interrupts enabled. */ __enable_irq(); } } diff --git a/FreeRTOS/Source/portable/RVDS/ARM_CM7/r0p1/port.c b/FreeRTOS/Source/portable/RVDS/ARM_CM7/r0p1/port.c index 2c00cf58f..967f5f10e 100644 --- a/FreeRTOS/Source/portable/RVDS/ARM_CM7/r0p1/port.c +++ b/FreeRTOS/Source/portable/RVDS/ARM_CM7/r0p1/port.c @@ -664,7 +664,7 @@ void xPortSysTickHandler( void ) vTaskStepTick( ulCompleteTickPeriods ); portNVIC_SYSTICK_LOAD_REG = ulTimerCountsForOneTick - 1UL; - /* Exit with interrpts enabled. */ + /* Exit with interrupts enabled. */ __enable_irq(); } } diff --git a/FreeRTOS/Source/tasks.c b/FreeRTOS/Source/tasks.c index 6cecac0e2..cf28a7184 100644 --- a/FreeRTOS/Source/tasks.c +++ b/FreeRTOS/Source/tasks.c @@ -368,7 +368,7 @@ PRIVILEGED_DATA static volatile UBaseType_t uxCurrentNumberOfTasks = ( UBaseTyp PRIVILEGED_DATA static volatile TickType_t xTickCount = ( TickType_t ) configINITIAL_TICK_COUNT; PRIVILEGED_DATA static volatile UBaseType_t uxTopReadyPriority = tskIDLE_PRIORITY; PRIVILEGED_DATA static volatile BaseType_t xSchedulerRunning = pdFALSE; -PRIVILEGED_DATA static volatile UBaseType_t uxPendedTicks = ( UBaseType_t ) 0U; +PRIVILEGED_DATA static volatile TickType_t xPendedTicks = ( TickType_t ) 0U; PRIVILEGED_DATA static volatile BaseType_t xYieldPending = pdFALSE; PRIVILEGED_DATA static volatile BaseType_t xNumOfOverflows = ( BaseType_t ) 0; PRIVILEGED_DATA static UBaseType_t uxTaskNumber = ( UBaseType_t ) 0U; @@ -2175,6 +2175,7 @@ BaseType_t xTaskResumeAll( void ) { TCB_t *pxTCB = NULL; BaseType_t xAlreadyYielded = pdFALSE; +TickType_t xTicksToNextUnblockTime; /* If uxSchedulerSuspended is zero then this function does not match a previous call to vTaskSuspendAll(). */ @@ -2229,30 +2230,51 @@ BaseType_t xAlreadyYielded = pdFALSE; they should be processed now. This ensures the tick count does not slip, and that any delayed tasks are resumed at the correct time. */ + while( xPendedTicks > ( TickType_t ) 0 ) { - UBaseType_t uxPendedCounts = uxPendedTicks; /* Non-volatile copy. */ + /* Calculate how far into the future the next task will + leave the Blocked state because its timeout expired. If + there are no tasks due to leave the blocked state between + the time now and the time at which the tick count overflows + then xNextTaskUnblockTime will the tick overflow time. + This means xNextTaskUnblockTime can never be less than + xTickCount, and the following can therefore not + underflow. */ + configASSERT( xNextTaskUnblockTime >= xTickCount ); + xTicksToNextUnblockTime = xNextTaskUnblockTime - xTickCount; - if( uxPendedCounts > ( UBaseType_t ) 0U ) + /* Don't want to move the tick count more than the number + of ticks that are pending, so cap if necessary. */ + if( xTicksToNextUnblockTime > xPendedTicks ) { - do - { - if( xTaskIncrementTick() != pdFALSE ) - { - xYieldPending = pdTRUE; - } - else - { - mtCOVERAGE_TEST_MARKER(); - } - --uxPendedCounts; - } while( uxPendedCounts > ( UBaseType_t ) 0U ); + xTicksToNextUnblockTime = xPendedTicks; + } - uxPendedTicks = 0; + if( xTicksToNextUnblockTime == 0 ) + { + /* xTicksToNextUnblockTime could be zero if the tick + count is about to overflow and xTicksToNetUnblockTime + holds the time at which the tick count will overflow + (rather than the time at which the next task will + unblock). Set to 1 otherwise xPendedTicks won't be + decremented below. */ + xTicksToNextUnblockTime = ( TickType_t ) 1; } - else + else if( xTicksToNextUnblockTime > ( TickType_t ) 1 ) { - mtCOVERAGE_TEST_MARKER(); + /* Move the tick count one short of the next unblock + time, then call xTaskIncrementTick() to move the tick + count up to the next unblock time to unblock the task, + if any. This will also swap the blocked task and + overflow blocked task lists if necessary. */ + xTickCount += ( xTicksToNextUnblockTime - ( TickType_t ) 1 ); } + xYieldPending |= xTaskIncrementTick(); + + /* Adjust for the number of ticks just added to + xTickCount and go around the loop again if + xTicksToCatchUp is still greater than 0. */ + xPendedTicks -= xTicksToNextUnblockTime; } if( xYieldPending != pdFALSE ) @@ -2586,6 +2608,24 @@ implementations require configUSE_TICKLESS_IDLE to be set to a value other than #endif /* configUSE_TICKLESS_IDLE */ /*----------------------------------------------------------*/ +BaseType_t xTaskCatchUpTicks( TickType_t xTicksToCatchUp ) +{ +BaseType_t xYieldRequired = pdFALSE; + + /* Must not be called with the scheduler suspended as the implementation + relies on xPendedTicks being wound down to 0 in xTaskResumeAll(). */ + configASSERT( uxSchedulerSuspended == 0 ); + + /* Use xPendedTicks to mimic xTicksToCatchUp number of ticks occuring when + the scheduler is suspended so the ticks are executed in xTaskResumeAll(). */ + vTaskSuspendAll(); + xPendedTicks += xTicksToCatchUp; + xYieldRequired = xTaskResumeAll(); + + return xYieldRequired; +} +/*----------------------------------------------------------*/ + #if ( INCLUDE_xTaskAbortDelay == 1 ) BaseType_t xTaskAbortDelay( TaskHandle_t xTask ) @@ -2793,7 +2833,7 @@ BaseType_t xSwitchRequired = pdFALSE; { /* Guard against the tick hook being called when the pended tick count is being unwound (when the scheduler is being unlocked). */ - if( uxPendedTicks == ( UBaseType_t ) 0U ) + if( xPendedTicks == ( TickType_t ) 0 ) { vApplicationTickHook(); } @@ -2806,7 +2846,7 @@ BaseType_t xSwitchRequired = pdFALSE; } else { - ++uxPendedTicks; + ++xPendedTicks; /* The tick hook gets called at regular intervals, even if the scheduler is locked. */ @@ -5078,7 +5118,7 @@ TickType_t uxReturn; #if( ( configGENERATE_RUN_TIME_STATS == 1 ) && ( INCLUDE_xTaskGetIdleTaskHandle == 1 ) ) - TickType_t xTaskGetIdleRunTimeCounter( void ) + uint32_t ulTaskGetIdleRunTimeCounter( void ) { return xIdleTaskHandle->ulRunTimeCounter; } -- 2.39.5