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134 lines
5.4 KiB
C
134 lines
5.4 KiB
C
/*
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FreeRTOS V7.5.2 - Copyright (C) 2013 Real Time Engineers Ltd.
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VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.
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***************************************************************************
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* *
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* FreeRTOS provides completely free yet professionally developed, *
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* robust, strictly quality controlled, supported, and cross *
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* platform software that has become a de facto standard. *
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* *
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* Help yourself get started quickly and support the FreeRTOS *
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* project by purchasing a FreeRTOS tutorial book, reference *
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* manual, or both from: http://www.FreeRTOS.org/Documentation *
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* *
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* Thank you! *
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* *
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***************************************************************************
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This file is part of the FreeRTOS distribution.
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FreeRTOS is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License (version 2) as published by the
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Free Software Foundation >>!AND MODIFIED BY!<< the FreeRTOS exception.
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>>! NOTE: The modification to the GPL is included to allow you to distribute
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>>! a combined work that includes FreeRTOS without being obliged to provide
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>>! the source code for proprietary components outside of the FreeRTOS
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>>! kernel.
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FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. Full license text is available from the following
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link: http://www.freertos.org/a00114.html
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1 tab == 4 spaces!
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***************************************************************************
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* *
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* Having a problem? Start by reading the FAQ "My application does *
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* not run, what could be wrong?" *
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* *
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* http://www.FreeRTOS.org/FAQHelp.html *
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* *
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***************************************************************************
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http://www.FreeRTOS.org - Documentation, books, training, latest versions,
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license and Real Time Engineers Ltd. contact details.
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http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
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including FreeRTOS+Trace - an indispensable productivity tool, a DOS
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compatible FAT file system, and our tiny thread aware UDP/IP stack.
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http://www.OpenRTOS.com - Real Time Engineers ltd license FreeRTOS to High
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Integrity Systems to sell under the OpenRTOS brand. Low cost OpenRTOS
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licenses offer ticketed support, indemnification and middleware.
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http://www.SafeRTOS.com - High Integrity Systems also provide a safety
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engineered and independently SIL3 certified version for use in safety and
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mission critical applications that require provable dependability.
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1 tab == 4 spaces!
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*/
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/*-----------------------------------------------------------
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* Components that can be compiled to either ARM or THUMB mode are
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* contained in serial.c The ISR routines, which can only be compiled
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* to ARM mode, are contained in this file.
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*----------------------------------------------------------*/
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/* Library includes. */
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#include "75x_uart.h"
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/* Scheduler includes. */
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#include "FreeRTOS.h"
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#include "queue.h"
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static xQueueHandle xRxedChars;
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static xQueueHandle xCharsForTx;
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static portBASE_TYPE volatile *pxQueueEmpty;
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void vConfigureQueues( xQueueHandle xQForRx, xQueueHandle xQForTx, portBASE_TYPE volatile *pxEmptyFlag )
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{
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xRxedChars = xQForRx;
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xCharsForTx = xQForTx;
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pxQueueEmpty = pxEmptyFlag;
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}
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/*-----------------------------------------------------------*/
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void vSerialISR( void )
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{
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signed char cChar;
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portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;
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do
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{
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if( UART0->MIS & UART_IT_Transmit )
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{
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/* The interrupt was caused by the THR becoming empty. Are there any
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more characters to transmit? */
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if( xQueueReceiveFromISR( xCharsForTx, &cChar, &xHigherPriorityTaskWoken ) == pdTRUE )
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{
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/* A character was retrieved from the queue so can be sent to the
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THR now. */
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UART0->DR = cChar;
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}
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else
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{
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*pxQueueEmpty = pdTRUE;
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}
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UART_ClearITPendingBit( UART0, UART_IT_Transmit );
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}
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if( UART0->MIS & UART_IT_Receive )
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{
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/* The interrupt was caused by a character being received. Grab the
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character from the RHR and place it in the queue of received
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characters. */
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cChar = UART0->DR;
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xQueueSendFromISR( xRxedChars, &cChar, &xHigherPriorityTaskWoken );
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UART_ClearITPendingBit( UART0, UART_IT_Receive );
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}
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} while( UART0->MIS );
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/* If a task was woken by either a character being received or a character
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being transmitted then we may need to switch to another task. */
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portEND_SWITCHING_ISR( xHigherPriorityTaskWoken );
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}
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