| /* | |
| FreeRTOS V7.1.1 - Copyright (C) 2012 Real Time Engineers Ltd. | |
| *************************************************************************** | |
| * * | |
| * FreeRTOS tutorial books are available in pdf and paperback. * | |
| * Complete, revised, and edited pdf reference manuals are also * | |
| * available. * | |
| * * | |
| * Purchasing FreeRTOS documentation will not only help you, by * | |
| * ensuring you get running as quickly as possible and with an * | |
| * in-depth knowledge of how to use FreeRTOS, it will also help * | |
| * the FreeRTOS project to continue with its mission of providing * | |
| * professional grade, cross platform, de facto standard solutions * | |
| * for microcontrollers - completely free of charge! * | |
| * * | |
| * >>> See http://www.FreeRTOS.org/Documentation for details. <<< * | |
| * * | |
| * Thank you for using FreeRTOS, and thank you for your support! * | |
| * * | |
| *************************************************************************** | |
| This file is part of the FreeRTOS distribution. | |
| FreeRTOS is free software; you can redistribute it and/or modify it under | |
| the terms of the GNU General Public License (version 2) as published by the | |
| Free Software Foundation AND MODIFIED BY the FreeRTOS exception. | |
| >>>NOTE<<< The modification to the GPL is included to allow you to | |
| distribute a combined work that includes FreeRTOS without being obliged to | |
| provide the source code for proprietary components outside of the FreeRTOS | |
| kernel. FreeRTOS is distributed in the hope that it will be useful, but | |
| WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY | |
| or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
| more details. You should have received a copy of the GNU General Public | |
| License and the FreeRTOS license exception along with FreeRTOS; if not it | |
| can be viewed here: http://www.freertos.org/a00114.html and also obtained | |
| by writing to Richard Barry, contact details for whom are available on the | |
| FreeRTOS WEB site. | |
| 1 tab == 4 spaces! | |
| *************************************************************************** | |
| * * | |
| * Having a problem? Start by reading the FAQ "My application does * | |
| * not run, what could be wrong? * | |
| * * | |
| * http://www.FreeRTOS.org/FAQHelp.html * | |
| * * | |
| *************************************************************************** | |
| http://www.FreeRTOS.org - Documentation, training, latest information, | |
| license and contact details. | |
| http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products, | |
| including FreeRTOS+Trace - an indispensable productivity tool. | |
| Real Time Engineers ltd license FreeRTOS to High Integrity Systems, who sell | |
| the code with commercial support, indemnification, and middleware, under | |
| the OpenRTOS brand: http://www.OpenRTOS.com. High Integrity Systems also | |
| provide a safety engineered and independently SIL3 certified version under | |
| the SafeRTOS brand: http://www.SafeRTOS.com. | |
| */ | |
| /* BASIC INTERRUPT DRIVEN SERIAL PORT DRIVER. | |
| NOTE: This driver is primarily to test the scheduler functionality. It does | |
| not effectively use the buffers or DMA and is therefore not intended to be | |
| an example of an efficient driver. */ | |
| /* Standard include file. */ | |
| #include <stdlib.h> | |
| #include <plib.h> | |
| /* Scheduler include files. */ | |
| #include "FreeRTOS.h" | |
| #include "queue.h" | |
| #include "task.h" | |
| /* Demo app include files. */ | |
| #include "serial.h" | |
| /* Hardware setup. */ | |
| #define serSET_FLAG ( 1 ) | |
| /* The queues used to communicate between tasks and ISR's. */ | |
| static xQueueHandle xRxedChars; | |
| static xQueueHandle xCharsForTx; | |
| /* Flag used to indicate the tx status. */ | |
| static portBASE_TYPE xTxHasEnded; | |
| /*-----------------------------------------------------------*/ | |
| /* The UART interrupt handler. As this uses the FreeRTOS assembly interrupt | |
| entry point the IPL setting in the following prototype has no effect. The | |
| interrupt priority is set by the call to ConfigIntUART2() in | |
| xSerialPortInitMinimal(). */ | |
| void __attribute__( (interrupt(ipl0), vector(_UART2_VECTOR))) vU2InterruptWrapper( void ); | |
| /*-----------------------------------------------------------*/ | |
| xComPortHandle xSerialPortInitMinimal( unsigned long ulWantedBaud, unsigned portBASE_TYPE uxQueueLength ) | |
| { | |
| unsigned short usBRG; | |
| /* Create the queues used by the com test task. */ | |
| xRxedChars = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( signed char ) ); | |
| xCharsForTx = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( signed char ) ); | |
| /* Configure the UART and interrupts. */ | |
| usBRG = (unsigned short)(( (float)configPERIPHERAL_CLOCK_HZ / ( (float)16 * (float)ulWantedBaud ) ) - (float)0.5); | |
| OpenUART2( UART_EN, UART_RX_ENABLE | UART_TX_ENABLE | UART_INT_TX | UART_INT_RX_CHAR, usBRG ); | |
| ConfigIntUART2( ( configKERNEL_INTERRUPT_PRIORITY + 1 ) | UART_INT_SUB_PR0 | UART_TX_INT_EN | UART_RX_INT_EN ); | |
| xTxHasEnded = pdTRUE; | |
| /* Only a single port is implemented so we don't need to return anything. */ | |
| return NULL; | |
| } | |
| /*-----------------------------------------------------------*/ | |
| signed portBASE_TYPE xSerialGetChar( xComPortHandle pxPort, signed char *pcRxedChar, portTickType xBlockTime ) | |
| { | |
| /* Only one port is supported. */ | |
| ( void ) pxPort; | |
| /* Get the next character from the buffer. Return false if no characters | |
| are available or arrive before xBlockTime expires. */ | |
| if( xQueueReceive( xRxedChars, pcRxedChar, xBlockTime ) ) | |
| { | |
| return pdTRUE; | |
| } | |
| else | |
| { | |
| return pdFALSE; | |
| } | |
| } | |
| /*-----------------------------------------------------------*/ | |
| signed portBASE_TYPE xSerialPutChar( xComPortHandle pxPort, signed char cOutChar, portTickType xBlockTime ) | |
| { | |
| /* Only one port is supported. */ | |
| ( void ) pxPort; | |
| /* Return false if after the block time there is no room on the Tx queue. */ | |
| if( xQueueSend( xCharsForTx, &cOutChar, xBlockTime ) != pdPASS ) | |
| { | |
| return pdFAIL; | |
| } | |
| /* A critical section should not be required as xTxHasEnded will not be | |
| written to by the ISR if it is already 0 (is this correct?). */ | |
| if( xTxHasEnded ) | |
| { | |
| xTxHasEnded = pdFALSE; | |
| IFS1SET = _IFS1_U2TXIF_MASK; | |
| } | |
| return pdPASS; | |
| } | |
| /*-----------------------------------------------------------*/ | |
| void vSerialClose( xComPortHandle xPort ) | |
| { | |
| } | |
| /*-----------------------------------------------------------*/ | |
| void vU2InterruptHandler( void ) | |
| { | |
| /* Declared static to minimise stack use. */ | |
| static char cChar; | |
| static portBASE_TYPE xHigherPriorityTaskWoken; | |
| xHigherPriorityTaskWoken = pdFALSE; | |
| /* Are any Rx interrupts pending? */ | |
| if( IFS1bits.U2RXIF == 1) | |
| { | |
| while( U2STAbits.URXDA ) | |
| { | |
| /* Retrieve the received character and place it in the queue of | |
| received characters. */ | |
| cChar = U2RXREG; | |
| xQueueSendFromISR( xRxedChars, &cChar, &xHigherPriorityTaskWoken ); | |
| } | |
| IFS1CLR = _IFS1_U2RXIF_MASK; | |
| } | |
| /* Are any Tx interrupts pending? */ | |
| if( IFS1bits.U2TXIF == 1 ) | |
| { | |
| while( !( U2STAbits.UTXBF ) ) | |
| { | |
| if( xQueueReceiveFromISR( xCharsForTx, &cChar, &xHigherPriorityTaskWoken ) == pdTRUE ) | |
| { | |
| /* Send the next character queued for Tx. */ | |
| U2TXREG = cChar; | |
| } | |
| else | |
| { | |
| /* Queue empty, nothing to send. */ | |
| xTxHasEnded = pdTRUE; | |
| break; | |
| } | |
| } | |
| IFS1CLR = _IFS1_U2TXIF_MASK; | |
| } | |
| /* If sending or receiving necessitates a context switch, then switch now. */ | |
| portEND_SWITCHING_ISR( xHigherPriorityTaskWoken ); | |
| } | |