/*\r
- FreeRTOS V7.4.0 - Copyright (C) 2013 Real Time Engineers Ltd.\r
+ FreeRTOS V7.5.3 - Copyright (C) 2013 Real Time Engineers Ltd. \r
+ All rights reserved\r
\r
- FEATURES AND PORTS ARE ADDED TO FREERTOS ALL THE TIME. PLEASE VISIT\r
- http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.\r
+ VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.\r
\r
***************************************************************************\r
* *\r
- * FreeRTOS tutorial books are available in pdf and paperback. *\r
- * Complete, revised, and edited pdf reference manuals are also *\r
- * available. *\r
+ * FreeRTOS provides completely free yet professionally developed, *\r
+ * robust, strictly quality controlled, supported, and cross *\r
+ * platform software that has become a de facto standard. *\r
* *\r
- * Purchasing FreeRTOS documentation will not only help you, by *\r
- * ensuring you get running as quickly as possible and with an *\r
- * in-depth knowledge of how to use FreeRTOS, it will also help *\r
- * the FreeRTOS project to continue with its mission of providing *\r
- * professional grade, cross platform, de facto standard solutions *\r
- * for microcontrollers - completely free of charge! *\r
+ * Help yourself get started quickly and support the FreeRTOS *\r
+ * project by purchasing a FreeRTOS tutorial book, reference *\r
+ * manual, or both from: http://www.FreeRTOS.org/Documentation *\r
* *\r
- * >>> See http://www.FreeRTOS.org/Documentation for details. <<< *\r
- * *\r
- * Thank you for using FreeRTOS, and thank you for your support! *\r
+ * Thank you! *\r
* *\r
***************************************************************************\r
\r
-\r
This file is part of the FreeRTOS distribution.\r
\r
FreeRTOS is free software; you can redistribute it and/or modify it under\r
the terms of the GNU General Public License (version 2) as published by the\r
- Free Software Foundation AND MODIFIED BY the FreeRTOS exception.\r
+ Free Software Foundation >>!AND MODIFIED BY!<< the FreeRTOS exception.\r
\r
- >>>>>>NOTE<<<<<< The modification to the GPL is included to allow you to\r
- distribute a combined work that includes FreeRTOS without being obliged to\r
- provide the source code for proprietary components outside of the FreeRTOS\r
- kernel.\r
+ >>! NOTE: The modification to the GPL is included to allow you to distribute\r
+ >>! a combined work that includes FreeRTOS without being obliged to provide\r
+ >>! the source code for proprietary components outside of the FreeRTOS\r
+ >>! kernel.\r
\r
FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY\r
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS\r
- FOR A PARTICULAR PURPOSE. See the GNU General Public License for more\r
- details. You should have received a copy of the GNU General Public License\r
- and the FreeRTOS license exception along with FreeRTOS; if not itcan be\r
- viewed here: http://www.freertos.org/a00114.html and also obtained by\r
- writing to Real Time Engineers Ltd., contact details for whom are available\r
- on the FreeRTOS WEB site.\r
+ FOR A PARTICULAR PURPOSE. Full license text is available from the following\r
+ link: http://www.freertos.org/a00114.html\r
\r
1 tab == 4 spaces!\r
\r
* *\r
***************************************************************************\r
\r
-\r
- http://www.FreeRTOS.org - Documentation, books, training, latest versions, \r
+ http://www.FreeRTOS.org - Documentation, books, training, latest versions,\r
license and Real Time Engineers Ltd. contact details.\r
\r
http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,\r
- including FreeRTOS+Trace - an indispensable productivity tool, and our new\r
- fully thread aware and reentrant UDP/IP stack.\r
-\r
- http://www.OpenRTOS.com - Real Time Engineers ltd license FreeRTOS to High \r
- Integrity Systems, who sell the code with commercial support, \r
- indemnification and middleware, under the OpenRTOS brand.\r
- \r
- http://www.SafeRTOS.com - High Integrity Systems also provide a safety \r
- engineered and independently SIL3 certified version for use in safety and \r
+ including FreeRTOS+Trace - an indispensable productivity tool, a DOS\r
+ compatible FAT file system, and our tiny thread aware UDP/IP stack.\r
+\r
+ http://www.OpenRTOS.com - Real Time Engineers ltd license FreeRTOS to High\r
+ Integrity Systems to sell under the OpenRTOS brand. Low cost OpenRTOS\r
+ licenses offer ticketed support, indemnification and middleware.\r
+\r
+ http://www.SafeRTOS.com - High Integrity Systems also provide a safety\r
+ engineered and independently SIL3 certified version for use in safety and\r
mission critical applications that require provable dependability.\r
+\r
+ 1 tab == 4 spaces!\r
*/\r
\r
/*-----------------------------------------------------------\r
#define portNVIC_SYSTICK_CTRL_REG ( * ( ( volatile unsigned long * ) 0xe000e010 ) )\r
#define portNVIC_SYSTICK_LOAD_REG ( * ( ( volatile unsigned long * ) 0xe000e014 ) )\r
#define portNVIC_SYSTICK_CURRENT_VALUE_REG ( * ( ( volatile unsigned long * ) 0xe000e018 ) )\r
-#define portNVIC_INT_CTRL_REG ( * ( ( volatile unsigned long * ) 0xe000ed04 ) )\r
#define portNVIC_SYSPRI2_REG ( * ( ( volatile unsigned long * ) 0xe000ed20 ) )\r
/* ...then bits in the registers. */\r
#define portNVIC_SYSTICK_CLK_BIT ( 1UL << 2UL )\r
#define portNVIC_SYSTICK_INT_BIT ( 1UL << 1UL )\r
#define portNVIC_SYSTICK_ENABLE_BIT ( 1UL << 0UL )\r
#define portNVIC_SYSTICK_COUNT_FLAG_BIT ( 1UL << 16UL )\r
-#define portNVIC_PENDSVSET_BIT ( 1UL << 28UL )\r
#define portNVIC_PENDSVCLEAR_BIT ( 1UL << 27UL )\r
#define portNVIC_PEND_SYSTICK_CLEAR_BIT ( 1UL << 25UL )\r
\r
-#define portNVIC_PENDSV_PRI ( ( ( unsigned long ) configKERNEL_INTERRUPT_PRIORITY ) << 16 )\r
-#define portNVIC_SYSTICK_PRI ( ( ( unsigned long ) configKERNEL_INTERRUPT_PRIORITY ) << 24 )\r
+#define portNVIC_PENDSV_PRI ( ( ( unsigned long ) configKERNEL_INTERRUPT_PRIORITY ) << 16UL )\r
+#define portNVIC_SYSTICK_PRI ( ( ( unsigned long ) configKERNEL_INTERRUPT_PRIORITY ) << 24UL )\r
+\r
+/* Constants required to check the validity of an interrupt priority. */\r
+#define portFIRST_USER_INTERRUPT_NUMBER ( 16 )\r
+#define portNVIC_IP_REGISTERS_OFFSET_16 ( 0xE000E3F0 )\r
+#define portAIRCR_REG ( * ( ( volatile unsigned long * ) 0xE000ED0C ) )\r
+#define portMAX_8_BIT_VALUE ( ( unsigned char ) 0xff )\r
+#define portTOP_BIT_OF_BYTE ( ( unsigned char ) 0x80 )\r
+#define portMAX_PRIGROUP_BITS ( ( unsigned char ) 7 )\r
+#define portPRIORITY_GROUP_MASK ( 0x07UL << 8UL )\r
+#define portPRIGROUP_SHIFT ( 8UL )\r
\r
/* Constants required to set up the initial stack. */\r
-#define portINITIAL_XPSR ( 0x01000000 )\r
+#define portINITIAL_XPSR ( 0x01000000 )\r
+\r
+/* The systick is a 24-bit counter. */\r
+#define portMAX_24_BIT_NUMBER ( 0xffffffUL )\r
+\r
+/* A fiddle factor to estimate the number of SysTick counts that would have\r
+occurred while the SysTick counter is stopped during tickless idle\r
+calculations. */\r
+#define portMISSED_COUNTS_FACTOR ( 45UL )\r
\r
/* For backward compatibility, ensure configKERNEL_INTERRUPT_PRIORITY is\r
defined. The value 255 should also ensure backward compatibility.\r
FreeRTOS.org versions prior to V4.3.0 did not include this definition. */\r
#ifndef configKERNEL_INTERRUPT_PRIORITY\r
- #define configKERNEL_INTERRUPT_PRIORITY 0\r
+ #define configKERNEL_INTERRUPT_PRIORITY 255\r
#endif\r
\r
/* Each task maintains its own interrupt status in the critical nesting\r
*/\r
extern void vPortStartFirstTask( void );\r
\r
+/*\r
+ * Used to catch tasks that attempt to return from their implementing function.\r
+ */\r
+static void prvTaskExitError( void );\r
+\r
/*-----------------------------------------------------------*/\r
\r
/*\r
* The number of SysTick increments that make up one tick period.\r
*/\r
#if configUSE_TICKLESS_IDLE == 1\r
- static unsigned long ulTimerReloadValueForOneTick = 0;\r
-#endif\r
+ static unsigned long ulTimerCountsForOneTick = 0;\r
+#endif /* configUSE_TICKLESS_IDLE */\r
\r
/*\r
* The maximum number of tick periods that can be suppressed is limited by the\r
static unsigned long ulStoppedTimerCompensation = 0;\r
#endif /* configUSE_TICKLESS_IDLE */\r
\r
+/*\r
+ * Used by the portASSERT_IF_INTERRUPT_PRIORITY_INVALID() macro to ensure\r
+ * FreeRTOS API functions are not called from interrupts that have been assigned\r
+ * a priority above configMAX_SYSCALL_INTERRUPT_PRIORITY.\r
+ */\r
+#if ( configASSERT_DEFINED == 1 )\r
+ static unsigned char ucMaxSysCallPriority = 0;\r
+ static unsigned long ulMaxPRIGROUPValue = 0;\r
+ static const volatile unsigned char * const pcInterruptPriorityRegisters = ( const volatile unsigned char * const ) portNVIC_IP_REGISTERS_OFFSET_16;\r
+#endif /* configASSERT_DEFINED */\r
+\r
/*-----------------------------------------------------------*/\r
\r
/*\r
pxTopOfStack--;\r
*pxTopOfStack = ( portSTACK_TYPE ) pxCode; /* PC */\r
pxTopOfStack--;\r
- *pxTopOfStack = 0; /* LR */\r
+ *pxTopOfStack = ( portSTACK_TYPE ) prvTaskExitError; /* LR */\r
pxTopOfStack -= 5; /* R12, R3, R2 and R1. */\r
*pxTopOfStack = ( portSTACK_TYPE ) pvParameters; /* R0 */\r
pxTopOfStack -= 8; /* R11, R10, R9, R8, R7, R6, R5 and R4. */\r
}\r
/*-----------------------------------------------------------*/\r
\r
+static void prvTaskExitError( void )\r
+{\r
+ /* A function that implements a task must not exit or attempt to return to\r
+ its caller as there is nothing to return to. If a task wants to exit it \r
+ should instead call vTaskDelete( NULL ).\r
+ \r
+ Artificially force an assert() to be triggered if configASSERT() is \r
+ defined, then stop here so application writers can catch the error. */\r
+ configASSERT( uxCriticalNesting == ~0UL );\r
+ portDISABLE_INTERRUPTS(); \r
+ for( ;; );\r
+}\r
+/*-----------------------------------------------------------*/\r
+\r
/*\r
* See header file for description.\r
*/\r
portBASE_TYPE xPortStartScheduler( void )\r
{\r
+ #if( configASSERT_DEFINED == 1 )\r
+ {\r
+ volatile unsigned long ulOriginalPriority;\r
+ volatile char * const pcFirstUserPriorityRegister = ( volatile char * const ) ( portNVIC_IP_REGISTERS_OFFSET_16 + portFIRST_USER_INTERRUPT_NUMBER );\r
+ volatile unsigned char ucMaxPriorityValue;\r
+\r
+ /* Determine the maximum priority from which ISR safe FreeRTOS API\r
+ functions can be called. ISR safe functions are those that end in\r
+ "FromISR". FreeRTOS maintains separate thread and ISR API functions to\r
+ ensure interrupt entry is as fast and simple as possible.\r
+\r
+ Save the interrupt priority value that is about to be clobbered. */\r
+ ulOriginalPriority = *pcFirstUserPriorityRegister;\r
+\r
+ /* Determine the number of priority bits available. First write to all\r
+ possible bits. */\r
+ *pcFirstUserPriorityRegister = portMAX_8_BIT_VALUE;\r
+\r
+ /* Read the value back to see how many bits stuck. */\r
+ ucMaxPriorityValue = *pcFirstUserPriorityRegister;\r
+\r
+ /* Use the same mask on the maximum system call priority. */\r
+ ucMaxSysCallPriority = configMAX_SYSCALL_INTERRUPT_PRIORITY & ucMaxPriorityValue;\r
+\r
+ /* Calculate the maximum acceptable priority group value for the number\r
+ of bits read back. */\r
+ ulMaxPRIGROUPValue = portMAX_PRIGROUP_BITS;\r
+ while( ( ucMaxPriorityValue & portTOP_BIT_OF_BYTE ) == portTOP_BIT_OF_BYTE )\r
+ {\r
+ ulMaxPRIGROUPValue--;\r
+ ucMaxPriorityValue <<= ( unsigned char ) 0x01;\r
+ }\r
+\r
+ /* Shift the priority group value back to its position within the AIRCR\r
+ register. */\r
+ ulMaxPRIGROUPValue <<= portPRIGROUP_SHIFT;\r
+ ulMaxPRIGROUPValue &= portPRIORITY_GROUP_MASK;\r
+\r
+ /* Restore the clobbered interrupt priority register to its original\r
+ value. */\r
+ *pcFirstUserPriorityRegister = ulOriginalPriority;\r
+ }\r
+ #endif /* conifgASSERT_DEFINED */\r
+\r
/* Make PendSV and SysTick the lowest priority interrupts. */\r
portNVIC_SYSPRI2_REG |= portNVIC_PENDSV_PRI;\r
portNVIC_SYSPRI2_REG |= portNVIC_SYSTICK_PRI;\r
}\r
/*-----------------------------------------------------------*/\r
\r
-void vPortYieldFromISR( void )\r
+void vPortYield( void )\r
{\r
/* Set a PendSV to request a context switch. */\r
portNVIC_INT_CTRL_REG = portNVIC_PENDSVSET_BIT;\r
+\r
+ /* Barriers are normally not required but do ensure the code is completely\r
+ within the specified behaviour for the architecture. */\r
+ __DSB();\r
+ __ISB();\r
}\r
/*-----------------------------------------------------------*/\r
\r
{\r
portDISABLE_INTERRUPTS();\r
uxCriticalNesting++;\r
+ __DSB();\r
+ __ISB();\r
}\r
/*-----------------------------------------------------------*/\r
\r
\r
void xPortSysTickHandler( void )\r
{\r
- /* If using preemption, also force a context switch. */\r
- #if configUSE_PREEMPTION == 1\r
- portNVIC_INT_CTRL_REG = portNVIC_PENDSVSET_BIT;\r
- #endif\r
-\r
- /* Only reset the systick load register if configUSE_TICKLESS_IDLE is set to\r
- 1. If it is set to 0 tickless idle is not being used. If it is set to a\r
- value other than 0 or 1 then a timer other than the SysTick is being used\r
- to generate the tick interrupt. */\r
- #if configUSE_TICKLESS_IDLE == 1\r
- portNVIC_SYSTICK_LOAD_REG = ulTimerReloadValueForOneTick;\r
- #endif\r
-\r
+ /* The SysTick runs at the lowest interrupt priority, so when this interrupt\r
+ executes all interrupts must be unmasked. There is therefore no need to\r
+ save and then restore the interrupt mask value as its value is already\r
+ known. */\r
( void ) portSET_INTERRUPT_MASK_FROM_ISR();\r
{\r
- vTaskIncrementTick();\r
+ /* Increment the RTOS tick. */\r
+ if( xTaskIncrementTick() != pdFALSE )\r
+ {\r
+ /* A context switch is required. Context switching is performed in\r
+ the PendSV interrupt. Pend the PendSV interrupt. */\r
+ portNVIC_INT_CTRL_REG = portNVIC_PENDSVSET_BIT;\r
+ }\r
}\r
portCLEAR_INTERRUPT_MASK_FROM_ISR( 0 );\r
}\r
\r
__weak void vPortSuppressTicksAndSleep( portTickType xExpectedIdleTime )\r
{\r
- unsigned long ulReloadValue, ulCompleteTickPeriods, ulCompletedSysTickIncrements;\r
+ unsigned long ulReloadValue, ulCompleteTickPeriods, ulCompletedSysTickDecrements;\r
portTickType xModifiableIdleTime;\r
\r
/* Make sure the SysTick reload value does not overflow the counter. */\r
xExpectedIdleTime = xMaximumPossibleSuppressedTicks;\r
}\r
\r
- /* Calculate the reload value required to wait xExpectedIdleTime\r
- tick periods. -1 is used because this code will execute part way\r
- through one of the tick periods, and the fraction of a tick period is\r
- accounted for later. */\r
- ulReloadValue = ( ulTimerReloadValueForOneTick * ( xExpectedIdleTime - 1UL ) );\r
- if( ulReloadValue > ulStoppedTimerCompensation )\r
- {\r
- ulReloadValue -= ulStoppedTimerCompensation;\r
- }\r
-\r
/* Stop the SysTick momentarily. The time the SysTick is stopped for\r
is accounted for as best it can be, but using the tickless mode will\r
inevitably result in some tiny drift of the time maintained by the\r
kernel with respect to calendar time. */\r
portNVIC_SYSTICK_CTRL_REG = portNVIC_SYSTICK_CLK_BIT | portNVIC_SYSTICK_INT_BIT;\r
\r
- /* Adjust the reload value to take into account that the current\r
- time slice is already partially complete. */\r
- ulReloadValue += ( portNVIC_SYSTICK_LOAD_REG - ( portNVIC_SYSTICK_LOAD_REG - portNVIC_SYSTICK_CURRENT_VALUE_REG ) );\r
+ /* Calculate the reload value required to wait xExpectedIdleTime\r
+ tick periods. -1 is used because this code will execute part way\r
+ through one of the tick periods. */\r
+ ulReloadValue = portNVIC_SYSTICK_CURRENT_VALUE_REG + ( ulTimerCountsForOneTick * ( xExpectedIdleTime - 1UL ) );\r
+ if( ulReloadValue > ulStoppedTimerCompensation )\r
+ {\r
+ ulReloadValue -= ulStoppedTimerCompensation;\r
+ }\r
\r
/* Enter a critical section but don't use the taskENTER_CRITICAL()\r
method as that will mask interrupts that should exit sleep mode. */\r
to be unsuspended then abandon the low power entry. */\r
if( eTaskConfirmSleepModeStatus() == eAbortSleep )\r
{\r
+ /* Restart from whatever is left in the count register to complete\r
+ this tick period. */\r
+ portNVIC_SYSTICK_LOAD_REG = portNVIC_SYSTICK_CURRENT_VALUE_REG;\r
+ \r
/* Restart SysTick. */\r
portNVIC_SYSTICK_CTRL_REG = portNVIC_SYSTICK_CLK_BIT | portNVIC_SYSTICK_INT_BIT | portNVIC_SYSTICK_ENABLE_BIT;\r
+ \r
+ /* Reset the reload register to the value required for normal tick\r
+ periods. */\r
+ portNVIC_SYSTICK_LOAD_REG = ulTimerCountsForOneTick - 1UL;\r
\r
/* Re-enable interrupts - see comments above __disable_interrupt()\r
call above. */\r
configPRE_SLEEP_PROCESSING( xModifiableIdleTime );\r
if( xModifiableIdleTime > 0 )\r
{\r
+ __DSB();\r
__WFI();\r
+ __ISB();\r
}\r
configPOST_SLEEP_PROCESSING( xExpectedIdleTime );\r
\r
\r
if( ( portNVIC_SYSTICK_CTRL_REG & portNVIC_SYSTICK_COUNT_FLAG_BIT ) != 0 )\r
{\r
+ unsigned long ulCalculatedLoadValue;\r
+ \r
/* The tick interrupt has already executed, and the SysTick\r
- count reloaded with the portNVIC_SYSTICK_LOAD_REG value.\r
- Reset the portNVIC_SYSTICK_LOAD_REG with whatever remains of\r
- this tick period. */\r
- portNVIC_SYSTICK_LOAD_REG = ulTimerReloadValueForOneTick - ( ulReloadValue - portNVIC_SYSTICK_CURRENT_VALUE_REG );\r
-\r
+ count reloaded with ulReloadValue. Reset the\r
+ portNVIC_SYSTICK_LOAD_REG with whatever remains of this tick\r
+ period. */\r
+ ulCalculatedLoadValue = ( ulTimerCountsForOneTick - 1UL ) - ( ulReloadValue - portNVIC_SYSTICK_CURRENT_VALUE_REG );\r
+\r
+ /* Don't allow a tiny value, or values that have somehow \r
+ underflowed because the post sleep hook did something \r
+ that took too long. */\r
+ if( ( ulCalculatedLoadValue < ulStoppedTimerCompensation ) || ( ulCalculatedLoadValue > ulTimerCountsForOneTick ) )\r
+ {\r
+ ulCalculatedLoadValue = ( ulTimerCountsForOneTick - 1UL );\r
+ }\r
+ \r
+ portNVIC_SYSTICK_LOAD_REG = ulCalculatedLoadValue;\r
+ \r
/* The tick interrupt handler will already have pended the tick\r
processing in the kernel. As the pending tick will be\r
processed as soon as this function exits, the tick value\r
else\r
{\r
/* Something other than the tick interrupt ended the sleep.\r
- Work out how long the sleep lasted. */\r
- ulCompletedSysTickIncrements = ( xExpectedIdleTime * ulTimerReloadValueForOneTick ) - portNVIC_SYSTICK_CURRENT_VALUE_REG;\r
+ Work out how long the sleep lasted rounded to complete tick\r
+ periods (not the ulReload value which accounted for part\r
+ ticks). */\r
+ ulCompletedSysTickDecrements = ( xExpectedIdleTime * ulTimerCountsForOneTick ) - portNVIC_SYSTICK_CURRENT_VALUE_REG;\r
\r
/* How many complete tick periods passed while the processor\r
was waiting? */\r
- ulCompleteTickPeriods = ulCompletedSysTickIncrements / ulTimerReloadValueForOneTick;\r
+ ulCompleteTickPeriods = ulCompletedSysTickDecrements / ulTimerCountsForOneTick;\r
\r
/* The reload value is set to whatever fraction of a single tick\r
period remains. */\r
- portNVIC_SYSTICK_LOAD_REG = ( ( ulCompleteTickPeriods + 1 ) * ulTimerReloadValueForOneTick ) - ulCompletedSysTickIncrements;\r
+ portNVIC_SYSTICK_LOAD_REG = ( ( ulCompleteTickPeriods + 1 ) * ulTimerCountsForOneTick ) - ulCompletedSysTickDecrements;\r
}\r
\r
/* Restart SysTick so it runs from portNVIC_SYSTICK_LOAD_REG\r
again, then set portNVIC_SYSTICK_LOAD_REG back to its standard\r
- value. */\r
+ value. The critical section is used to ensure the tick interrupt\r
+ can only execute once in the case that the reload register is near\r
+ zero. */\r
portNVIC_SYSTICK_CURRENT_VALUE_REG = 0UL;\r
- portNVIC_SYSTICK_CTRL_REG = portNVIC_SYSTICK_CLK_BIT | portNVIC_SYSTICK_INT_BIT | portNVIC_SYSTICK_ENABLE_BIT;\r
-\r
- vTaskStepTick( ulCompleteTickPeriods );\r
+ portENTER_CRITICAL();\r
+ {\r
+ portNVIC_SYSTICK_CTRL_REG = portNVIC_SYSTICK_CLK_BIT | portNVIC_SYSTICK_INT_BIT | portNVIC_SYSTICK_ENABLE_BIT;\r
+ vTaskStepTick( ulCompleteTickPeriods );\r
+ portNVIC_SYSTICK_LOAD_REG = ulTimerCountsForOneTick - 1UL;\r
+ }\r
+ portEXIT_CRITICAL();\r
}\r
}\r
\r
/* Calculate the constants required to configure the tick interrupt. */\r
#if configUSE_TICKLESS_IDLE == 1\r
{\r
- ulTimerReloadValueForOneTick = ( configSYSTICK_CLOCK_HZ / configTICK_RATE_HZ ) - 1UL;\r
- xMaximumPossibleSuppressedTicks = 0xffffffUL / ( ( configSYSTICK_CLOCK_HZ / configTICK_RATE_HZ ) - 1UL );\r
- ulStoppedTimerCompensation = 45UL / ( configCPU_CLOCK_HZ / configSYSTICK_CLOCK_HZ );\r
+ ulTimerCountsForOneTick = ( configSYSTICK_CLOCK_HZ / configTICK_RATE_HZ );\r
+ xMaximumPossibleSuppressedTicks = portMAX_24_BIT_NUMBER / ulTimerCountsForOneTick;\r
+ ulStoppedTimerCompensation = portMISSED_COUNTS_FACTOR / ( configCPU_CLOCK_HZ / configSYSTICK_CLOCK_HZ );\r
}\r
#endif /* configUSE_TICKLESS_IDLE */\r
\r
portNVIC_SYSTICK_CTRL_REG = portNVIC_SYSTICK_CLK_BIT | portNVIC_SYSTICK_INT_BIT | portNVIC_SYSTICK_ENABLE_BIT;\r
}\r
/*-----------------------------------------------------------*/\r
+\r
+#if( configASSERT_DEFINED == 1 )\r
+\r
+ void vPortValidateInterruptPriority( void )\r
+ {\r
+ unsigned long ulCurrentInterrupt;\r
+ unsigned char ucCurrentPriority;\r
+\r
+ /* Obtain the number of the currently executing interrupt. */\r
+ __asm volatile( "mrs %0, ipsr" : "=r"( ulCurrentInterrupt ) );\r
+\r
+ /* Is the interrupt number a user defined interrupt? */\r
+ if( ulCurrentInterrupt >= portFIRST_USER_INTERRUPT_NUMBER )\r
+ {\r
+ /* Look up the interrupt's priority. */\r
+ ucCurrentPriority = pcInterruptPriorityRegisters[ ulCurrentInterrupt ];\r
+\r
+ /* The following assertion will fail if a service routine (ISR) for\r
+ an interrupt that has been assigned a priority above\r
+ configMAX_SYSCALL_INTERRUPT_PRIORITY calls an ISR safe FreeRTOS API\r
+ function. ISR safe FreeRTOS API functions must *only* be called\r
+ from interrupts that have been assigned a priority at or below\r
+ configMAX_SYSCALL_INTERRUPT_PRIORITY.\r
+\r
+ Numerically low interrupt priority numbers represent logically high\r
+ interrupt priorities, therefore the priority of the interrupt must\r
+ be set to a value equal to or numerically *higher* than\r
+ configMAX_SYSCALL_INTERRUPT_PRIORITY.\r
+\r
+ Interrupts that use the FreeRTOS API must not be left at their\r
+ default priority of zero as that is the highest possible priority,\r
+ which is guaranteed to be above configMAX_SYSCALL_INTERRUPT_PRIORITY,\r
+ and therefore also guaranteed to be invalid.\r
+\r
+ FreeRTOS maintains separate thread and ISR API functions to ensure\r
+ interrupt entry is as fast and simple as possible.\r
+\r
+ The following links provide detailed information:\r
+ http://www.freertos.org/RTOS-Cortex-M3-M4.html\r
+ http://www.freertos.org/FAQHelp.html */\r
+ configASSERT( ucCurrentPriority >= ucMaxSysCallPriority );\r
+ }\r
+\r
+ /* Priority grouping: The interrupt controller (NVIC) allows the bits\r
+ that define each interrupt's priority to be split between bits that\r
+ define the interrupt's pre-emption priority bits and bits that define\r
+ the interrupt's sub-priority. For simplicity all bits must be defined\r
+ to be pre-emption priority bits. The following assertion will fail if\r
+ this is not the case (if some bits represent a sub-priority).\r
+\r
+ If the application only uses CMSIS libraries for interrupt\r
+ configuration then the correct setting can be achieved on all Cortex-M\r
+ devices by calling NVIC_SetPriorityGrouping( 0 ); before starting the\r
+ scheduler. Note however that some vendor specific peripheral libraries\r
+ assume a non-zero priority group setting, in which cases using a value\r
+ of zero will result in unpredicable behaviour. */\r
+ configASSERT( ( portAIRCR_REG & portPRIORITY_GROUP_MASK ) <= ulMaxPRIGROUPValue );\r
+ }\r
+\r
+#endif /* configASSERT_DEFINED */\r
+\r
+\r
+\r
+\r
+\r
+\r
+\r
+\r
+\r
+\r
+\r
+\r
+\r
+\r
+\r
+\r
+\r
+\r
+\r
+\r
\r
projects / freertos / blobdiff