118 lines
4.0 KiB
C
118 lines
4.0 KiB
C
/*
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* FreeRTOS V202212.00
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* Copyright (C) 2020 Amazon.com, Inc. or its affiliates. All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy of
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* this software and associated documentation files (the "Software"), to deal in
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* the Software without restriction, including without limitation the rights to
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* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
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* the Software, and to permit persons to whom the Software is furnished to do so,
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* subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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* https://www.FreeRTOS.org
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* https://github.com/FreeRTOS
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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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*/
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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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