+++ /dev/null
-/*This file has been prepared for Doxygen automatic documentation generation.*/\r
-/*! \file *********************************************************************\r
- *\r
- * \brief FreeRTOS Serial Port management example for AVR32 UC3.\r
- *\r
- * - Compiler: IAR EWAVR32 and GNU GCC for AVR32\r
- * - Supported devices: All AVR32 devices can be used.\r
- * - AppNote:\r
- *\r
- * \author Atmel Corporation: http://www.atmel.com \n\r
- * Support and FAQ: http://support.atmel.no/\r
- *\r
- *****************************************************************************/\r
-\r
-/* Copyright (c) 2007, Atmel Corporation All rights reserved.\r
- *\r
- * Redistribution and use in source and binary forms, with or without\r
- * modification, are permitted provided that the following conditions are met:\r
- *\r
- * 1. Redistributions of source code must retain the above copyright notice,\r
- * this list of conditions and the following disclaimer.\r
- *\r
- * 2. Redistributions in binary form must reproduce the above copyright notice,\r
- * this list of conditions and the following disclaimer in the documentation\r
- * and/or other materials provided with the distribution.\r
- *\r
- * 3. The name of ATMEL may not be used to endorse or promote products derived\r
- * from this software without specific prior written permission.\r
- *\r
- * THIS SOFTWARE IS PROVIDED BY ATMEL ``AS IS'' AND ANY EXPRESS OR IMPLIED\r
- * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF\r
- * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE EXPRESSLY AND\r
- * SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT,\r
- * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES\r
- * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;\r
- * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND\r
- * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT\r
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF\r
- * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.\r
- */\r
-\r
-\r
-/*\r
- BASIC INTERRUPT DRIVEN SERIAL PORT DRIVER FOR USART.\r
-*/\r
-\r
-/* Scheduler includes. */\r
-#include "FreeRTOS.h"\r
-#include "queue.h"\r
-#include "task.h"\r
-\r
-/* Demo application includes. */\r
-#include "serial.h"\r
-#include <avr32/io.h>\r
-#include "board.h"\r
-#include "gpio.h"\r
-\r
-/*-----------------------------------------------------------*/\r
-\r
-/* Constants to setup and access the USART. */\r
-#define serINVALID_COMPORT_HANDLER ( ( xComPortHandle ) 0 )\r
-#define serINVALID_QUEUE ( ( xQueueHandle ) 0 )\r
-#define serHANDLE ( ( xComPortHandle ) 1 )\r
-#define serNO_BLOCK ( ( portTickType ) 0 )\r
-\r
-/*-----------------------------------------------------------*/\r
-\r
-/* Queues used to hold received characters, and characters waiting to be\r
-transmitted. */\r
-static xQueueHandle xRxedChars;\r
-static xQueueHandle xCharsForTx;\r
-\r
-/*-----------------------------------------------------------*/\r
-\r
-/* Forward declaration. */\r
-static void vprvSerialCreateQueues( unsigned portBASE_TYPE uxQueueLength,\r
- xQueueHandle *pxRxedChars,\r
- xQueueHandle *pxCharsForTx );\r
-\r
-/*-----------------------------------------------------------*/\r
-\r
-#if __GNUC__\r
- __attribute__((__noinline__))\r
-#elif __ICCAVR32__\r
- #pragma optimize = no_inline\r
-#endif\r
-\r
-static portBASE_TYPE prvUSART_ISR_NonNakedBehaviour( void )\r
-{\r
- /* Now we can declare the local variables. */\r
- signed portCHAR cChar;\r
- portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;\r
- unsigned portLONG ulStatus;\r
- volatile avr32_usart_t *usart = serialPORT_USART;\r
- portBASE_TYPE retstatus;\r
-\r
- /* What caused the interrupt? */\r
- ulStatus = usart->csr & usart->imr;\r
-\r
- if (ulStatus & AVR32_USART_CSR_TXRDY_MASK)\r
- {\r
- /* The interrupt was caused by the THR becoming empty. Are there any\r
- more characters to transmit?\r
- Because FreeRTOS is not supposed to run with nested interrupts, put all OS\r
- calls in a critical section . */\r
- portENTER_CRITICAL();\r
- retstatus = xQueueReceiveFromISR( xCharsForTx, &cChar, &xHigherPriorityTaskWoken );\r
- portEXIT_CRITICAL();\r
-\r
- if (retstatus == pdTRUE)\r
- {\r
- /* A character was retrieved from the queue so can be sent to the\r
- THR now. */\r
- usart->thr = cChar;\r
- }\r
- else\r
- {\r
- /* Queue empty, nothing to send so turn off the Tx interrupt. */\r
- usart->idr = AVR32_USART_IDR_TXRDY_MASK;\r
- }\r
- }\r
-\r
- if (ulStatus & AVR32_USART_CSR_RXRDY_MASK)\r
- {\r
- /* The interrupt was caused by the receiver getting data. */\r
- cChar = usart->rhr; //TODO\r
-\r
- /* Because FreeRTOS is not supposed to run with nested interrupts, put all OS\r
- calls in a critical section . */\r
- portENTER_CRITICAL();\r
- xQueueSendFromISR(xRxedChars, &cChar, &xHigherPriorityTaskWoken);\r
- portEXIT_CRITICAL();\r
- }\r
-\r
- /* The return value will be used by portEXIT_SWITCHING_ISR() to know if it\r
- should perform a vTaskSwitchContext(). */\r
- return ( xHigherPriorityTaskWoken );\r
-}\r
-/*-----------------------------------------------------------*/\r
-\r
-/*\r
- * USART interrupt service routine.\r
- */\r
-#if __GNUC__\r
- __attribute__((__naked__))\r
-#elif __ICCAVR32__\r
- #pragma shadow_registers = full // Naked.\r
-#endif\r
-\r
-static void vUSART_ISR( void )\r
-{\r
- /* This ISR can cause a context switch, so the first statement must be a\r
- call to the portENTER_SWITCHING_ISR() macro. This must be BEFORE any\r
- variable declarations. */\r
- portENTER_SWITCHING_ISR();\r
-\r
- prvUSART_ISR_NonNakedBehaviour();\r
-\r
- /* Exit the ISR. If a task was woken by either a character being received\r
- or transmitted then a context switch will occur. */\r
- portEXIT_SWITCHING_ISR();\r
-}\r
-/*-----------------------------------------------------------*/\r
-\r
-\r
-/*\r
- * Init the serial port for the Minimal implementation.\r
- */\r
-xComPortHandle xSerialPortInitMinimal( unsigned portLONG ulWantedBaud, unsigned portBASE_TYPE uxQueueLength )\r
-{\r
-static const gpio_map_t USART_GPIO_MAP =\r
-{\r
- { serialPORT_USART_RX_PIN, serialPORT_USART_RX_FUNCTION },\r
- { serialPORT_USART_TX_PIN, serialPORT_USART_TX_FUNCTION }\r
-};\r
-\r
-xComPortHandle xReturn = serHANDLE;\r
-volatile avr32_usart_t *usart = serialPORT_USART;\r
-int cd; /* USART Clock Divider. */\r
-\r
- /* Create the rx and tx queues. */\r
- vprvSerialCreateQueues( uxQueueLength, &xRxedChars, &xCharsForTx );\r
-\r
- /* Configure USART. */\r
- if( ( xRxedChars != serINVALID_QUEUE ) &&\r
- ( xCharsForTx != serINVALID_QUEUE ) &&\r
- ( ulWantedBaud != ( unsigned portLONG ) 0 ) )\r
- {\r
- portENTER_CRITICAL();\r
- {\r
- /**\r
- ** Reset USART.\r
- **/\r
- /* Disable all USART interrupt sources to begin... */\r
- usart->idr = 0xFFFFFFFF;\r
-\r
- /* Reset mode and other registers that could cause unpredictable\r
- behaviour after reset */\r
- usart->mr = 0; /* Reset Mode register. */\r
- usart->rtor = 0; /* Reset Receiver Time-out register. */\r
- usart->ttgr = 0; /* Reset Transmitter Timeguard register. */\r
-\r
- /* Shutdown RX and TX, reset status bits, reset iterations in CSR, reset NACK\r
- and turn off DTR and RTS */\r
- usart->cr = AVR32_USART_CR_RSTRX_MASK |\r
- AVR32_USART_CR_RSTTX_MASK |\r
- AVR32_USART_CR_RXDIS_MASK |\r
- AVR32_USART_CR_TXDIS_MASK |\r
- AVR32_USART_CR_RSTSTA_MASK |\r
- AVR32_USART_CR_RSTIT_MASK |\r
- AVR32_USART_CR_RSTNACK_MASK |\r
- AVR32_USART_CR_DTRDIS_MASK |\r
- AVR32_USART_CR_RTSDIS_MASK;\r
-\r
- /**\r
- ** Configure USART.\r
- **/\r
- /* Enable USART RXD & TXD pins. */\r
- gpio_enable_module( USART_GPIO_MAP, sizeof( USART_GPIO_MAP ) / sizeof( USART_GPIO_MAP[0] ) );\r
-\r
- /* Set the USART baudrate to be as close as possible to the wanted baudrate. */\r
- /*\r
- * ** BAUDRATE CALCULATION **\r
- *\r
- * Selected Clock Selected Clock\r
- * baudrate = ---------------- or baudrate = ----------------\r
- * 16 x CD 8 x CD\r
- *\r
- * (with 16x oversampling) (with 8x oversampling)\r
- */\r
-\r
- if( ulWantedBaud < ( configCPU_CLOCK_HZ / 16 ) )\r
- {\r
- /* Use 8x oversampling */\r
- usart->mr |= (1<<AVR32_USART_MR_OVER_OFFSET);\r
- cd = configCPU_CLOCK_HZ / (8*ulWantedBaud);\r
-\r
- if( cd < 2 )\r
- {\r
- return serINVALID_COMPORT_HANDLER;\r
- }\r
-\r
- usart->brgr = (cd << AVR32_USART_BRGR_CD_OFFSET);\r
- }\r
- else\r
- {\r
- /* Use 16x oversampling */\r
- usart->mr &= ~(1<<AVR32_USART_MR_OVER_OFFSET);\r
- cd = configCPU_CLOCK_HZ / (16*ulWantedBaud);\r
-\r
- if( cd > 65535 )\r
- {\r
- /* Baudrate is too low */\r
- return serINVALID_COMPORT_HANDLER;\r
- }\r
- }\r
-\r
- usart->brgr = (cd << AVR32_USART_BRGR_CD_OFFSET);\r
-\r
- /* Set the USART Mode register: Mode=Normal(0), Clk selection=MCK(0),\r
- CHRL=8, SYNC=0(asynchronous), PAR=None, NBSTOP=1, CHMODE=0, MSBF=0,\r
- MODE9=0, CKLO=0, OVER(previously done when setting the baudrate),\r
- other fields not used in this mode. */\r
- usart->mr |= ((8-5) << AVR32_USART_MR_CHRL_OFFSET ) |\r
- ( 4 << AVR32_USART_MR_PAR_OFFSET ) |\r
- ( 1 << AVR32_USART_MR_NBSTOP_OFFSET);\r
-\r
- /* Write the Transmit Timeguard Register */\r
- usart->ttgr = 0;\r
-\r
-\r
- /* Register the USART interrupt handler to the interrupt controller and\r
- enable the USART interrupt. */\r
- INTC_register_interrupt((__int_handler)&vUSART_ISR, serialPORT_USART_IRQ, INT1);\r
-\r
- /* Enable USART interrupt sources (but not Tx for now)... */\r
- usart->ier = AVR32_USART_IER_RXRDY_MASK;\r
-\r
- /* Enable receiver and transmitter... */\r
- usart->cr |= AVR32_USART_CR_TXEN_MASK | AVR32_USART_CR_RXEN_MASK;\r
- }\r
- portEXIT_CRITICAL();\r
- }\r
- else\r
- {\r
- xReturn = serINVALID_COMPORT_HANDLER;\r
- }\r
-\r
- return xReturn;\r
-}\r
-/*-----------------------------------------------------------*/\r
-\r
-signed portBASE_TYPE xSerialGetChar( xComPortHandle pxPort, signed portCHAR *pcRxedChar, portTickType xBlockTime )\r
-{\r
- /* The port handle is not required as this driver only supports UART0. */\r
- ( void ) pxPort;\r
-\r
- /* Get the next character from the buffer. Return false if no characters\r
- are available, or arrive before xBlockTime expires. */\r
- if( xQueueReceive( xRxedChars, pcRxedChar, xBlockTime ) )\r
- {\r
- return pdTRUE;\r
- }\r
- else\r
- {\r
- return pdFALSE;\r
- }\r
-}\r
-/*-----------------------------------------------------------*/\r
-\r
-void vSerialPutString( xComPortHandle pxPort, const signed portCHAR * const pcString, unsigned portSHORT usStringLength )\r
-{\r
-signed portCHAR *pxNext;\r
-\r
- /* NOTE: This implementation does not handle the queue being full as no\r
- block time is used! */\r
-\r
- /* The port handle is not required as this driver only supports UART0. */\r
- ( void ) pxPort;\r
-\r
- /* Send each character in the string, one at a time. */\r
- pxNext = ( signed portCHAR * ) pcString;\r
- while( *pxNext )\r
- {\r
- xSerialPutChar( pxPort, *pxNext, serNO_BLOCK );\r
- pxNext++;\r
- }\r
-}\r
-/*-----------------------------------------------------------*/\r
-\r
-signed portBASE_TYPE xSerialPutChar( xComPortHandle pxPort, signed portCHAR cOutChar, portTickType xBlockTime )\r
-{\r
-volatile avr32_usart_t *usart = serialPORT_USART;\r
-\r
- /* Place the character in the queue of characters to be transmitted. */\r
- if( xQueueSend( xCharsForTx, &cOutChar, xBlockTime ) != pdPASS )\r
- {\r
- return pdFAIL;\r
- }\r
-\r
- /* Turn on the Tx interrupt so the ISR will remove the character from the\r
- queue and send it. This does not need to be in a critical section as\r
- if the interrupt has already removed the character the next interrupt\r
- will simply turn off the Tx interrupt again. */\r
- usart->ier = (1 << AVR32_USART_IER_TXRDY_OFFSET);\r
-\r
- return pdPASS;\r
-}\r
-/*-----------------------------------------------------------*/\r
-\r
-void vSerialClose( xComPortHandle xPort )\r
-{\r
- /* Not supported as not required by the demo application. */\r
-}\r
-/*-----------------------------------------------------------*/\r
-\r
-/*###########################################################*/\r
-\r
-/*\r
- * Create the rx and tx queues.\r
- */\r
-static void vprvSerialCreateQueues( unsigned portBASE_TYPE uxQueueLength, xQueueHandle *pxRxedChars, xQueueHandle *pxCharsForTx )\r
-{\r
- /* Create the queues used to hold Rx and Tx characters. */\r
- xRxedChars = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( signed portCHAR ) );\r
- xCharsForTx = xQueueCreate( uxQueueLength + 1, ( unsigned portBASE_TYPE ) sizeof( signed portCHAR ) );\r
-\r
- /* Pass back a reference to the queues so the serial API file can\r
- post/receive characters. */\r
- *pxRxedChars = xRxedChars;\r
- *pxCharsForTx = xCharsForTx;\r
-}\r
-/*-----------------------------------------------------------*/\r
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