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246 lines
8.2 KiB
C
246 lines
8.2 KiB
C
/*
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FreeRTOS V8.0.0 - 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 DEMO PURPOSES */
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#include <stdlib.h>
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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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#include "serial.h"
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/* Constants required to setup the serial control register. */
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#define ser8_BIT_MODE ( ( unsigned char ) 0x40 )
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#define serRX_ENABLE ( ( unsigned char ) 0x10 )
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/* Constants to setup the timer used to generate the baud rate. */
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#define serCLOCK_DIV_48 ( ( unsigned char ) 0x03 )
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#define serUSE_PRESCALED_CLOCK ( ( unsigned char ) 0x10 )
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#define ser8BIT_WITH_RELOAD ( ( unsigned char ) 0x20 )
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#define serSMOD ( ( unsigned char ) 0x10 )
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static QueueHandle_t xRxedChars;
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static QueueHandle_t xCharsForTx;
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data static unsigned portBASE_TYPE uxTxEmpty;
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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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unsigned long ulReloadValue;
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const portFLOAT fBaudConst = ( portFLOAT ) configCPU_CLOCK_HZ * ( portFLOAT ) 2.0;
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unsigned char ucOriginalSFRPage;
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portENTER_CRITICAL();
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{
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ucOriginalSFRPage = SFRPAGE;
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SFRPAGE = 0;
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uxTxEmpty = pdTRUE;
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/* Create the queues used by the com test task. */
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xRxedChars = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( char ) );
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xCharsForTx = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( char ) );
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/* Calculate the baud rate to use timer 1. */
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ulReloadValue = ( unsigned long ) ( ( ( portFLOAT ) 256 - ( fBaudConst / ( portFLOAT ) ( 32 * ulWantedBaud ) ) ) + ( portFLOAT ) 0.5 );
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/* Set timer one for desired mode of operation. */
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TMOD &= 0x08;
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TMOD |= ser8BIT_WITH_RELOAD;
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SSTA0 |= serSMOD;
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/* Set the reload and start values for the time. */
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TL1 = ( unsigned char ) ulReloadValue;
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TH1 = ( unsigned char ) ulReloadValue;
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/* Setup the control register for standard n, 8, 1 - variable baud rate. */
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SCON = ser8_BIT_MODE | serRX_ENABLE;
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/* Enable the serial port interrupts */
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ES = 1;
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/* Start the timer. */
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TR1 = 1;
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SFRPAGE = ucOriginalSFRPage;
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}
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portEXIT_CRITICAL();
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/* Unlike some ports, this serial code does not allow for more than one
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com port. We therefore don't return a pointer to a port structure and can
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instead just return NULL. */
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return NULL;
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}
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/*-----------------------------------------------------------*/
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void vSerialISR( void ) interrupt 4
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{
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char cChar;
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portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;
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/* 8051 port interrupt routines MUST be placed within a critical section
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if taskYIELD() is used within the ISR! */
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portENTER_CRITICAL();
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{
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if( RI )
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{
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/* Get the character and post it on the queue of Rxed characters.
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If the post causes a task to wake force a context switch if the woken task
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has a higher priority than the task we have interrupted. */
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cChar = SBUF;
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RI = 0;
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xQueueSendFromISR( xRxedChars, &cChar, &xHigherPriorityTaskWoken );
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}
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if( TI )
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{
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if( xQueueReceiveFromISR( xCharsForTx, &cChar, &xHigherPriorityTaskWoken ) == ( portBASE_TYPE ) pdTRUE )
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{
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/* Send the next character queued for Tx. */
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SBUF = cChar;
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}
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else
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{
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/* Queue empty, nothing to send. */
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uxTxEmpty = pdTRUE;
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}
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TI = 0;
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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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portEXIT_CRITICAL();
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}
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/*-----------------------------------------------------------*/
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portBASE_TYPE xSerialGetChar( xComPortHandle pxPort, signed char *pcRxedChar, TickType_t xBlockTime )
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{
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/* There is only one port supported. */
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( void ) pxPort;
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/* Get the next character from the buffer. 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 ( portBASE_TYPE ) pdTRUE;
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}
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else
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{
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return ( portBASE_TYPE ) pdFALSE;
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}
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}
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/*-----------------------------------------------------------*/
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portBASE_TYPE xSerialPutChar( xComPortHandle pxPort, signed char cOutChar, TickType_t xBlockTime )
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{
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portBASE_TYPE xReturn;
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/* There is only one port supported. */
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( void ) pxPort;
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portENTER_CRITICAL();
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{
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if( uxTxEmpty == pdTRUE )
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{
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SBUF = cOutChar;
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uxTxEmpty = pdFALSE;
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xReturn = ( portBASE_TYPE ) pdTRUE;
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}
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else
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{
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xReturn = xQueueSend( xCharsForTx, &cOutChar, xBlockTime );
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if( xReturn == ( portBASE_TYPE ) pdFALSE )
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{
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xReturn = ( portBASE_TYPE ) pdTRUE;
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}
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}
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}
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portEXIT_CRITICAL();
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return xReturn;
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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 implemented in this port. */
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( void ) xPort;
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}
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/*-----------------------------------------------------------*/
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