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211 lines
7.6 KiB
C
211 lines
7.6 KiB
C
/*
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FreeRTOS V8.0.0:rc1 - Copyright (C) 2014 Real Time Engineers Ltd.
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All rights reserved
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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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/* BASIC INTERRUPT DRIVEN SERIAL PORT DRIVER for port 1.
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Note that this driver is written to test the RTOS port and is not intended
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to represent an optimised solution. */
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/* Processor Expert generated includes. */
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#include "com0.h"
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/* Scheduler include files. */
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#include "FreeRTOS.h"
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#include "queue.h"
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#include "task.h"
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/* Demo application include files. */
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#include "serial.h"
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/* The queues used to communicate between the task code and the interrupt
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service routines. */
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static QueueHandle_t xRxedChars;
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static QueueHandle_t xCharsForTx;
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/* Interrupt identification bits. */
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#define serOVERRUN_INTERRUPT ( 0x08 )
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#define serRX_INTERRUPT ( 0x20 )
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#define serTX_INTERRUPT ( 0x80 )
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/*-----------------------------------------------------------*/
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/*
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* Initialise port for interrupt driven communications.
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*/
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xComPortHandle xSerialPortInitMinimal( unsigned long ulWantedBaud, unsigned portBASE_TYPE uxQueueLength )
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{
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/* Hardware setup is performed by the Processor Expert generated code.
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This function just creates the queues used to communicate between the
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interrupt code and the task code - then sets the required baud rate. */
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xRxedChars = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( signed char ) );
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xCharsForTx = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( signed char ) );
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COM0_SetBaudRateMode( ( char ) ulWantedBaud );
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return NULL;
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}
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/*-----------------------------------------------------------*/
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signed portBASE_TYPE xSerialGetChar( xComPortHandle pxPort, signed char *pcRxedChar, TickType_t xBlockTime )
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{
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/* Get the next character from the buffer queue. Return false if no characters
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are available, or arrive before xBlockTime expires. */
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if( xQueueReceive( xRxedChars, pcRxedChar, xBlockTime ) )
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{
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return pdTRUE;
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}
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else
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{
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return pdFALSE;
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}
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}
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/*-----------------------------------------------------------*/
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signed portBASE_TYPE xSerialPutChar( xComPortHandle pxPort, signed char cOutChar, TickType_t xBlockTime )
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{
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/* Place the character in the queue of characters to be transmitted. */
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if( xQueueSend( xCharsForTx, &cOutChar, xBlockTime ) != pdPASS )
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{
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return pdFAIL;
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}
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/* Turn on the Tx interrupt so the ISR will remove the character from the
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queue and send it. This does not need to be in a critical section as
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if the interrupt has already removed the character the next interrupt
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will simply turn off the Tx interrupt again. */
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SCI0CR2_SCTIE = 1;;
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return pdPASS;
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}
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/*-----------------------------------------------------------*/
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void vSerialClose( xComPortHandle xPort )
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{
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/* Not supported. */
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( void ) xPort;
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}
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/*-----------------------------------------------------------*/
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/*
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* Interrupt service routine for the serial port. Must be in non-banked
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* memory.
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*/
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#pragma CODE_SEG __NEAR_SEG NON_BANKED
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__interrupt void vCOM0_ISR( void )
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{
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volatile unsigned char ucByte, ucStatus;
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portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;
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/* What caused the interrupt? */
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ucStatus = SCI0SR1;
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if( ucStatus & serOVERRUN_INTERRUPT )
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{
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/* The interrupt was caused by an overrun. Clear the error by reading
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the data register. */
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ucByte = SCI0DRL;
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}
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if( ucStatus & serRX_INTERRUPT )
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{
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/* The interrupt was caused by a character being received.
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Read the received byte. */
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ucByte = SCI0DRL;
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/* Post the character onto the queue of received characters - noting
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whether or not this wakes a task. */
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xQueueSendFromISR( xRxedChars, ( void * ) &ucByte, &xHigherPriorityTaskWoken );
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}
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if( ( ucStatus & serTX_INTERRUPT ) && ( SCI0CR2_SCTIE ) )
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{
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/* The interrupt was caused by a character being transmitted. */
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if( xQueueReceiveFromISR( xCharsForTx, ( void * ) &ucByte, &xHigherPriorityTaskWoken ) == pdTRUE )
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{
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/* Clear the SCRF bit. */
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SCI0DRL = ucByte;
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}
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else
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{
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/* Disable transmit interrupt */
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SCI0CR2_SCTIE = 0;
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}
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}
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if( xHigherPriorityTaskWoken )
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{
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portYIELD();
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}
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}
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#pragma CODE_SEG DEFAULT
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