/* | |
FreeRTOS.org V5.1.0 - Copyright (C) 2003-2008 Richard Barry. | |
This file is part of the FreeRTOS.org distribution. | |
FreeRTOS.org is free software; you can redistribute it and/or modify | |
it under the terms of the GNU General Public License as published by | |
the Free Software Foundation; either version 2 of the License, or | |
(at your option) any later version. | |
FreeRTOS.org is distributed in the hope that it will be useful, | |
but WITHOUT ANY WARRANTY; without even the implied warranty of | |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
GNU General Public License for more details. | |
You should have received a copy of the GNU General Public License | |
along with FreeRTOS.org; if not, write to the Free Software | |
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
A special exception to the GPL can be applied should you wish to distribute | |
a combined work that includes FreeRTOS.org, without being obliged to provide | |
the source code for any proprietary components. See the licensing section | |
of http://www.FreeRTOS.org for full details of how and when the exception | |
can be applied. | |
*************************************************************************** | |
*************************************************************************** | |
* * | |
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Please ensure to read the configuration and relevant port sections of the | |
online documentation. | |
http://www.FreeRTOS.org - Documentation, latest information, license and | |
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*/ | |
/** | |
* This version of flash .c is for use on systems that have limited stack space | |
* and no display facilities. The complete version can be found in the | |
* Demo/Common/Full directory. | |
* | |
* Three tasks are created, each of which flash an LED at a different rate. The first | |
* LED flashes every 200ms, the second every 400ms, the third every 600ms. | |
* | |
* The LED flash tasks provide instant visual feedback. They show that the scheduler | |
* is still operational. | |
* | |
*/ | |
#include <stdlib.h> | |
/* Scheduler include files. */ | |
#include "FreeRTOS.h" | |
#include "task.h" | |
/* Demo program include files. */ | |
#include "partest.h" | |
#include "flash.h" | |
#define ledSTACK_SIZE configMINIMAL_STACK_SIZE | |
#define ledNUMBER_OF_LEDS ( 3 ) | |
#define ledFLASH_RATE_BASE ( ( portTickType ) 333 ) | |
/* Variable used by the created tasks to calculate the LED number to use, and | |
the rate at which they should flash the LED. */ | |
static volatile unsigned portBASE_TYPE uxFlashTaskNumber = 0; | |
/* The task that is created three times. */ | |
static portTASK_FUNCTION_PROTO( vLEDFlashTask, pvParameters ); | |
/*-----------------------------------------------------------*/ | |
void vStartLEDFlashTasks( unsigned portBASE_TYPE uxPriority ) | |
{ | |
signed portBASE_TYPE xLEDTask; | |
/* Create the three tasks. */ | |
for( xLEDTask = 0; xLEDTask < ledNUMBER_OF_LEDS; ++xLEDTask ) | |
{ | |
/* Spawn the task. */ | |
xTaskCreate( vLEDFlashTask, ( signed portCHAR * ) "LEDx", ledSTACK_SIZE, NULL, uxPriority, ( xTaskHandle * ) NULL ); | |
} | |
} | |
/*-----------------------------------------------------------*/ | |
static portTASK_FUNCTION( vLEDFlashTask, pvParameters ) | |
{ | |
portTickType xFlashRate, xLastFlashTime; | |
unsigned portBASE_TYPE uxLED; | |
/* The parameters are not used. */ | |
( void ) pvParameters; | |
/* Calculate the LED and flash rate. */ | |
portENTER_CRITICAL(); | |
{ | |
/* See which of the eight LED's we should use. */ | |
uxLED = uxFlashTaskNumber; | |
/* Update so the next task uses the next LED. */ | |
uxFlashTaskNumber++; | |
} | |
portEXIT_CRITICAL(); | |
xFlashRate = ledFLASH_RATE_BASE + ( ledFLASH_RATE_BASE * ( portTickType ) uxLED ); | |
xFlashRate /= portTICK_RATE_MS; | |
/* We will turn the LED on and off again in the delay period, so each | |
delay is only half the total period. */ | |
xFlashRate /= ( portTickType ) 2; | |
/* We need to initialise xLastFlashTime prior to the first call to | |
vTaskDelayUntil(). */ | |
xLastFlashTime = xTaskGetTickCount(); | |
for(;;) | |
{ | |
/* Delay for half the flash period then turn the LED on. */ | |
vTaskDelayUntil( &xLastFlashTime, xFlashRate ); | |
vParTestToggleLED( uxLED ); | |
/* Delay for half the flash period then turn the LED off. */ | |
vTaskDelayUntil( &xLastFlashTime, xFlashRate ); | |
vParTestToggleLED( uxLED ); | |
} | |
} /*lint !e715 !e818 !e830 Function definition must be standard for task creation. */ | |