河北水利局项目
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Common/Minimal/flash.c
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161
Common/Minimal/flash.c
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/*
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FreeRTOS V9.0.0 - Copyright (C) 2016 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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* 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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*/
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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 ( ( TickType_t ) 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 UBaseType_t 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( UBaseType_t uxPriority )
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{
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BaseType_t 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, "LEDx", ledSTACK_SIZE, NULL, uxPriority, ( TaskHandle_t * ) 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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TickType_t xFlashRate, xLastFlashTime;
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UBaseType_t 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 * ( TickType_t ) uxLED );
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xFlashRate /= portTICK_PERIOD_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 /= ( TickType_t ) 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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