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Add FreeRTOS-Plus directory.
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FreeRTOS/Demo/HCS12_CodeWarrior_banked/serial/serial.c
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FreeRTOS/Demo/HCS12_CodeWarrior_banked/serial/serial.c
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/*
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FreeRTOS V7.1.1 - Copyright (C) 2012 Real Time Engineers Ltd.
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***************************************************************************
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* *
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* FreeRTOS tutorial books are available in pdf and paperback. *
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* Complete, revised, and edited pdf reference manuals are also *
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* available. *
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* *
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* Purchasing FreeRTOS documentation will not only help you, by *
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* ensuring you get running as quickly as possible and with an *
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* in-depth knowledge of how to use FreeRTOS, it will also help *
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* the FreeRTOS project to continue with its mission of providing *
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* professional grade, cross platform, de facto standard solutions *
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* for microcontrollers - completely free of charge! *
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* *
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* >>> See http://www.FreeRTOS.org/Documentation for details. <<< *
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* *
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* Thank you for using FreeRTOS, and thank you for your support! *
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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
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distribute a combined work that includes FreeRTOS without being obliged to
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provide the source code for proprietary components outside of the FreeRTOS
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kernel. FreeRTOS is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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more details. You should have received a copy of the GNU General Public
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License and the FreeRTOS license exception along with FreeRTOS; if not it
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can be viewed here: http://www.freertos.org/a00114.html and also obtained
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by writing to Richard Barry, contact details for whom are available on the
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FreeRTOS WEB site.
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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, training, latest information,
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license and 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.
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Real Time Engineers ltd license FreeRTOS to High Integrity Systems, who sell
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the code with commercial support, indemnification, and middleware, under
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the OpenRTOS brand: http://www.OpenRTOS.com. High Integrity Systems also
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provide a safety engineered and independently SIL3 certified version under
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the SafeRTOS brand: http://www.SafeRTOS.com.
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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 xQueueHandle xRxedChars;
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static xQueueHandle 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, portTickType 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, portTickType 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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