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171 lines
6.9 KiB
C
171 lines
6.9 KiB
C
/*
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FreeRTOS V8.2.3 - Copyright (C) 2015 Real Time Engineers Ltd.
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All rights reserved
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VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.
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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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***************************************************************************
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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 !<<
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>>! obliged to provide the source code for proprietary components !<<
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>>! outside of the FreeRTOS kernel. !<<
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***************************************************************************
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FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. Full license text is available on the following
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link: http://www.freertos.org/a00114.html
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***************************************************************************
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* *
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* FreeRTOS provides completely free yet professionally developed, *
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* robust, strictly quality controlled, supported, and cross *
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* platform software that is more than just the market leader, it *
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* is the industry's de facto standard. *
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* *
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* Help yourself get started quickly while simultaneously helping *
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* to support the FreeRTOS project by purchasing a FreeRTOS *
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* tutorial book, reference manual, or both: *
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* http://www.FreeRTOS.org/Documentation *
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* *
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***************************************************************************
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http://www.FreeRTOS.org/FAQHelp.html - Having a problem? Start by reading
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the FAQ page "My application does not run, what could be wrong?". Have you
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defined configASSERT()?
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http://www.FreeRTOS.org/support - In return for receiving this top quality
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embedded software for free we request you assist our global community by
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participating in the support forum.
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http://www.FreeRTOS.org/training - Investing in training allows your team to
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be as productive as possible as early as possible. Now you can receive
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FreeRTOS training directly from Richard Barry, CEO of Real Time Engineers
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Ltd, and the world's leading authority on the world's leading RTOS.
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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, a DOS
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compatible FAT file system, and our tiny thread aware UDP/IP stack.
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http://www.FreeRTOS.org/labs - Where new FreeRTOS products go to incubate.
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Come and try FreeRTOS+TCP, our new open source TCP/IP stack for FreeRTOS.
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http://www.OpenRTOS.com - Real Time Engineers ltd. license FreeRTOS to High
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Integrity Systems ltd. to sell under the OpenRTOS brand. Low cost OpenRTOS
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licenses offer ticketed support, indemnification and commercial middleware.
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http://www.SafeRTOS.com - High Integrity Systems also provide a safety
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engineered and independently SIL3 certified version for use in safety and
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mission critical applications that require provable dependability.
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1 tab == 4 spaces!
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*/
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/**
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* Creates eight tasks, each of which flash an LED at a different rate. The first
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* LED flashes every 125ms, the second every 250ms, the third every 375ms, etc.
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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.
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*
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* \page flashC flash.c
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* \ingroup DemoFiles
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* <HR>
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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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TickType_t rather than unsigned long.
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Changes from V2.1.1
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+ The stack size now uses configMINIMAL_STACK_SIZE.
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+ String constants made file scope to decrease stack depth on 8051 port.
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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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#include "print.h"
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#define ledSTACK_SIZE configMINIMAL_STACK_SIZE
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/* Structure used to pass parameters to the LED tasks. */
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typedef struct LED_PARAMETERS
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{
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unsigned portBASE_TYPE uxLED; /*< The output the task should use. */
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TickType_t xFlashRate; /*< The rate at which the LED should flash. */
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} xLEDParameters;
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/* The task that is created eight times - each time with a different xLEDParaemtes
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structure passed in as the parameter. */
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static void vLEDFlashTask( void *pvParameters );
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/* String to print if USE_STDIO is defined. */
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const char * const pcTaskStartMsg = "LED flash task started.\r\n";
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/*-----------------------------------------------------------*/
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void vStartLEDFlashTasks( unsigned portBASE_TYPE uxPriority )
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{
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unsigned portBASE_TYPE uxLEDTask;
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xLEDParameters *pxLEDParameters;
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const unsigned portBASE_TYPE uxNumOfLEDs = 8;
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const TickType_t xFlashRate = 125;
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/* Create the eight tasks. */
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for( uxLEDTask = 0; uxLEDTask < uxNumOfLEDs; ++uxLEDTask )
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{
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/* Create and complete the structure used to pass parameters to the next
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created task. */
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pxLEDParameters = ( xLEDParameters * ) pvPortMalloc( sizeof( xLEDParameters ) );
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pxLEDParameters->uxLED = uxLEDTask;
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pxLEDParameters->xFlashRate = ( xFlashRate + ( xFlashRate * ( TickType_t ) uxLEDTask ) );
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pxLEDParameters->xFlashRate /= portTICK_PERIOD_MS;
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/* Spawn the task. */
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xTaskCreate( vLEDFlashTask, "LEDx", ledSTACK_SIZE, ( void * ) pxLEDParameters, uxPriority, ( TaskHandle_t * ) NULL );
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}
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}
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/*-----------------------------------------------------------*/
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static void vLEDFlashTask( void *pvParameters )
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{
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xLEDParameters *pxParameters;
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/* Queue a message for printing to say the task has started. */
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vPrintDisplayMessage( &pcTaskStartMsg );
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pxParameters = ( xLEDParameters * ) pvParameters;
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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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vTaskDelay( pxParameters->xFlashRate / ( TickType_t ) 2 );
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vParTestToggleLED( pxParameters->uxLED );
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/* Delay for half the flash period then turn the LED off. */
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vTaskDelay( pxParameters->xFlashRate / ( TickType_t ) 2 );
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vParTestToggleLED( pxParameters->uxLED );
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}
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}
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