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139 lines
4.6 KiB
C
139 lines
4.6 KiB
C
/*
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FreeRTOS V4.0.1 - Copyright (C) 2003-2006 Richard Barry.
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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
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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FreeRTOS is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with FreeRTOS; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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A special exception to the GPL can be applied should you wish 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 any proprietary components. See the licensing section
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of http://www.FreeRTOS.org for full details of how and when the exception
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can be applied.
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***************************************************************************
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See http://www.FreeRTOS.org for documentation, latest information, license
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and contact details. Please ensure to read the configuration and relevant
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port sections of the online documentation.
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***************************************************************************
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*/
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/**
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* This version of flash .c is for use on systems that have limited stack space
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* and no display facilities. The complete version can be found in the
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* Demo/Common/Full directory.
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*
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* Three tasks are created, each of which flash an LED at a different rate. The first
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* LED flashes every 200ms, the second every 400ms, the third every 600ms.
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*
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* The LED flash tasks provide instant visual feedback. They show that the scheduler
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* is still operational.
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*
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* The PC port uses the standard parallel port for outputs, the Flashlite 186 port
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* uses IO port F and the AVR port port B.
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*
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*/
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/*
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Changes from V2.0.0
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+ Delay periods are now specified using variables and constants of
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portTickType rather than unsigned portLONG.
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Changes from V2.5.5
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+ Calls to vTaskDelay() have been replaced with vTaskDelayUntil().
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*/
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#include <stdlib.h>
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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 program include files. */
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#include "partest.h"
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#include "flash.h"
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#define ledSTACK_SIZE configMINIMAL_STACK_SIZE
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#define ledNUMBER_OF_LEDS ( 3 )
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#define ledFLASH_RATE_BASE ( ( portTickType ) 333 )
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/* Variable used by the created tasks to calculate the LED number to use, and
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the rate at which they should flash the LED. */
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static volatile unsigned portBASE_TYPE uxFlashTaskNumber = 0;
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/* The task that is created three times. */
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static portTASK_FUNCTION_PROTO( vLEDFlashTask, pvParameters );
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/*-----------------------------------------------------------*/
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void vStartLEDFlashTasks( unsigned portBASE_TYPE uxPriority )
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{
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signed portBASE_TYPE xLEDTask;
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/* Create the three tasks. */
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for( xLEDTask = 0; xLEDTask < ledNUMBER_OF_LEDS; ++xLEDTask )
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{
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/* Spawn the task. */
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xTaskCreate( vLEDFlashTask, ( const signed portCHAR * const ) "LEDx", ledSTACK_SIZE, NULL, uxPriority, ( xTaskHandle * ) NULL );
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}
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}
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/*-----------------------------------------------------------*/
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static portTASK_FUNCTION( vLEDFlashTask, pvParameters )
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{
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portTickType xFlashRate, xLastFlashTime;
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unsigned portBASE_TYPE uxLED;
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/* The parameters are not used. */
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( void ) pvParameters;
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/* Calculate the LED and flash rate. */
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portENTER_CRITICAL();
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{
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/* See which of the eight LED's we should use. */
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uxLED = uxFlashTaskNumber;
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/* Update so the next task uses the next LED. */
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uxFlashTaskNumber++;
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}
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portEXIT_CRITICAL();
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xFlashRate = ledFLASH_RATE_BASE + ( ledFLASH_RATE_BASE * ( portTickType ) uxLED );
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xFlashRate /= portTICK_RATE_MS;
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/* We will turn the LED on and off again in the delay period, so each
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delay is only half the total period. */
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xFlashRate /= ( portTickType ) 2;
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/* We need to initialise xLastFlashTime prior to the first call to
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vTaskDelayUntil(). */
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xLastFlashTime = xTaskGetTickCount();
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for(;;)
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{
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/* Delay for half the flash period then turn the LED on. */
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vTaskDelayUntil( &xLastFlashTime, xFlashRate );
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vParTestToggleLED( uxLED );
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/* Delay for half the flash period then turn the LED off. */
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vTaskDelayUntil( &xLastFlashTime, xFlashRate );
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vParTestToggleLED( uxLED );
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}
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} /*lint !e715 !e818 !e830 Function definition must be standard for task creation. */
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