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Before changing headers to V6 and changing portLONG, portSHORt and portCHAR to their standard C types.
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Richard Barry
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185
20091005/Demo/PIC18_WizC/Demo6/main.c
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20091005/Demo/PIC18_WizC/Demo6/main.c
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/*
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FreeRTOS V5.4.2 - Copyright (C) 2009 Real Time Engineers Ltd.
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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 exception to the GPL is included to allow you to distribute a
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combined work that includes FreeRTOS without being obliged to provide the
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source code for proprietary components outside of the FreeRTOS kernel.
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Alternative commercial license and support terms are also available upon
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request. See the licensing section of http://www.FreeRTOS.org for full
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license details.
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FreeRTOS is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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more details.
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You should have received a copy of the GNU General Public License along
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with FreeRTOS; if not, write to the Free Software Foundation, Inc., 59
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Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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***************************************************************************
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* *
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* Looking for a quick start? Then check out the FreeRTOS eBook! *
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* See http://www.FreeRTOS.org/Documentation for details *
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* *
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***************************************************************************
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1 tab == 4 spaces!
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Please ensure to read the configuration and relevant port sections of the
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online documentation.
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http://www.FreeRTOS.org - Documentation, latest information, license and
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contact details.
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http://www.SafeRTOS.com - A version that is certified for use in safety
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critical systems.
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http://www.OpenRTOS.com - Commercial support, development, porting,
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licensing and training services.
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*/
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/*
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Changes from V3.0.0
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Changes from V3.0.1
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*/
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/*
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* Instead of the normal single demo application, the PIC18F demo is split
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* into several smaller programs of which this is the sixth. This enables the
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* demo's to be executed on the RAM limited PIC-devices.
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*
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* The Demo6 project is configured for a PIC18F4620 device. Main.c starts 4
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* tasks (including the idle task). See the indicated files in the demo/common
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* directory for more information.
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*
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* demo/common/minimal/comtest.c: Creates 2 tasks
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* ATTENTION: Comtest needs a loopback-connector on the serial port.
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*
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* Main.c also creates a check task. This periodically checks that all the
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* other tasks are still running and have not experienced any unexpected
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* results. If all the other tasks are executing correctly an LED is flashed
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* once every mainCHECK_PERIOD milliseconds. If any of the tasks have not
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* executed, or report an error, the frequency of the LED flash will increase
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* to mainERROR_FLASH_RATE.
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*
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* http://www.FreeRTOS.org contains important information on the use of the
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* wizC PIC18F port.
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*/
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/* Scheduler include files. */
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#include <FreeRTOS.h>
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#include <task.h>
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/* Demo app include files. */
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#include "partest.h"
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#include "serial.h"
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#include "comtest.h"
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/* The period between executions of the check task before and after an error
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has been discovered. If an error has been discovered the check task runs
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more frequently - increasing the LED flash rate. */
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#define mainNO_ERROR_CHECK_PERIOD ( ( portTickType ) 10000 / portTICK_RATE_MS )
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#define mainERROR_CHECK_PERIOD ( ( portTickType ) 1000 / portTICK_RATE_MS )
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#define mainCHECK_TASK_LED ( ( unsigned portCHAR ) 3 )
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/* Priority definitions for some of the tasks. Other tasks just use the idle
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priority. */
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#define mainCHECK_TASK_PRIORITY ( tskIDLE_PRIORITY + ( unsigned portCHAR ) 2 )
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#define mainCOMM_TEST_PRIORITY ( tskIDLE_PRIORITY + ( unsigned portCHAR ) 1 )
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/* The LED that is toggled whenever a character is transmitted.
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mainCOMM_TX_RX_LED + 1 will be toggled every time a character is received. */
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#define mainCOMM_TX_RX_LED ( ( unsigned portCHAR ) 0 )
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/* Constants required for the communications. */
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#define mainBAUD_RATE ( ( unsigned portLONG ) 57600 )
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/*
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* The task function for the "Check" task.
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*/
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static portTASK_FUNCTION_PROTO( vErrorChecks, pvParameters );
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/*
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* Checks the unique counts of other tasks to ensure they are still operational.
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* Returns pdTRUE if an error is detected, otherwise pdFALSE.
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*/
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static portCHAR prvCheckOtherTasksAreStillRunning( void );
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/*-----------------------------------------------------------*/
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/* Creates the tasks, then starts the scheduler. */
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void main( void )
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{
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/* Initialise the required hardware. */
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vParTestInitialise();
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/* Start a few of the standard demo tasks found in the demo\common directory. */
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vAltStartComTestTasks( mainCOMM_TEST_PRIORITY, mainBAUD_RATE, mainCOMM_TX_RX_LED );
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/* Start the check task defined in this file. */
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xTaskCreate( vErrorChecks, ( const portCHAR * const ) "Check", portMINIMAL_STACK_SIZE, NULL, mainCHECK_TASK_PRIORITY, NULL );
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/* Start the scheduler. Will never return here. */
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vTaskStartScheduler();
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while(1) /* This point should never be reached. */
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{
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}
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}
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/*-----------------------------------------------------------*/
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static portTASK_FUNCTION( vErrorChecks, pvParameters )
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{
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portTickType xLastCheckTime;
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portTickType xDelayTime = mainNO_ERROR_CHECK_PERIOD;
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portCHAR cErrorOccurred;
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/* We need to initialise xLastCheckTime prior to the first call to
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vTaskDelayUntil(). */
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xLastCheckTime = xTaskGetTickCount();
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/* Cycle for ever, delaying then checking all the other tasks are still
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operating without error. */
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for( ;; )
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{
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/* Wait until it is time to check the other tasks again. */
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vTaskDelayUntil( &xLastCheckTime, xDelayTime );
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/* Check all the other tasks are running, and running without ever
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having an error. */
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cErrorOccurred = prvCheckOtherTasksAreStillRunning();
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/* If an error was detected increase the frequency of the LED flash. */
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if( cErrorOccurred == pdTRUE )
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{
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xDelayTime = mainERROR_CHECK_PERIOD;
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}
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/* Flash the LED for visual feedback. */
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vParTestToggleLED( mainCHECK_TASK_LED );
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}
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}
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/*-----------------------------------------------------------*/
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static portCHAR prvCheckOtherTasksAreStillRunning( void )
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{
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portCHAR cErrorHasOccurred = ( portCHAR ) pdFALSE;
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if( xAreComTestTasksStillRunning() != pdTRUE )
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{
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cErrorHasOccurred = ( portCHAR ) pdTRUE;
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}
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return cErrorHasOccurred;
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}
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/*-----------------------------------------------------------*/
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