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FreeRTOS V5.4.2 - Copyright (C) 2009 Real Time Engineers Ltd.
This file is part of the FreeRTOS distribution.
FreeRTOS is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License (version 2) as published by the
Free Software Foundation and modified by the FreeRTOS exception.
**NOTE** The exception to the GPL is included to allow you to distribute a
combined work that includes FreeRTOS without being obliged to provide the
source code for proprietary components outside of the FreeRTOS kernel.
Alternative commercial license and support terms are also available upon
request. See the licensing section of for full
license details.
FreeRTOS 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; if not, write to the Free Software Foundation, Inc., 59
Temple Place, Suite 330, Boston, MA 02111-1307 USA.
* *
* Looking for a quick start? Then check out the FreeRTOS eBook! *
* See for details *
* *
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Please ensure to read the configuration and relevant port sections of the
online documentation. - Documentation, latest information, license and
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* Creates eight tasks, each of which flash an LED at a different rate. The first
* LED flashes every 125ms, the second every 250ms, the third every 375ms, etc.
* The LED flash tasks provide instant visual feedback. They show that the scheduler
* is still operational.
* The PC port uses the standard parallel port for outputs, the Flashlite 186 port
* uses IO port F.
* \page flashC flash.c
* \ingroup DemoFiles
* <HR>
Changes from V2.0.0
+ Delay periods are now specified using variables and constants of
portTickType rather than unsigned portLONG.
Changes from V2.1.1
+ The stack size now uses configMINIMAL_STACK_SIZE.
+ String constants made file scope to decrease stack depth on 8051 port.
#include <stdlib.h>
/* Scheduler include files. */
#include "FreeRTOS.h"
#include "task.h"
/* Demo program include files. */
#include "partest.h"
#include "flash.h"
#include "print.h"
/* Structure used to pass parameters to the LED tasks. */
typedef struct LED_PARAMETERS
unsigned portBASE_TYPE uxLED; /*< The output the task should use. */
portTickType xFlashRate; /*< The rate at which the LED should flash. */
} xLEDParameters;
/* The task that is created eight times - each time with a different xLEDParaemtes
structure passed in as the parameter. */
static void vLEDFlashTask( void *pvParameters );
/* String to print if USE_STDIO is defined. */
const portCHAR * const pcTaskStartMsg = "LED flash task started.\r\n";
void vStartLEDFlashTasks( unsigned portBASE_TYPE uxPriority )
unsigned portBASE_TYPE uxLEDTask;
xLEDParameters *pxLEDParameters;
const unsigned portBASE_TYPE uxNumOfLEDs = 8;
const portTickType xFlashRate = 125;
/* Create the eight tasks. */
for( uxLEDTask = 0; uxLEDTask < uxNumOfLEDs; ++uxLEDTask )
/* Create and complete the structure used to pass parameters to the next
created task. */
pxLEDParameters = ( xLEDParameters * ) pvPortMalloc( sizeof( xLEDParameters ) );
pxLEDParameters->uxLED = uxLEDTask;
pxLEDParameters->xFlashRate = ( xFlashRate + ( xFlashRate * ( portTickType ) uxLEDTask ) );
pxLEDParameters->xFlashRate /= portTICK_RATE_MS;
/* Spawn the task. */
xTaskCreate( vLEDFlashTask, "LEDx", ledSTACK_SIZE, ( void * ) pxLEDParameters, uxPriority, ( xTaskHandle * ) NULL );
static void vLEDFlashTask( void *pvParameters )
xLEDParameters *pxParameters;
/* Queue a message for printing to say the task has started. */
vPrintDisplayMessage( &pcTaskStartMsg );
pxParameters = ( xLEDParameters * ) pvParameters;
/* Delay for half the flash period then turn the LED on. */
vTaskDelay( pxParameters->xFlashRate / ( portTickType ) 2 );
vParTestToggleLED( pxParameters->uxLED );
/* Delay for half the flash period then turn the LED off. */
vTaskDelay( pxParameters->xFlashRate / ( portTickType ) 2 );
vParTestToggleLED( pxParameters->uxLED );