mirror of
https://github.com/FreeRTOS/FreeRTOS-Kernel.git
synced 2025-10-17 10:17:45 -04:00
138 lines
4.4 KiB
C
138 lines
4.4 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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* Defines the tasks used to toggle the segments of the left
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* seven segment display, as described at the top of main.c
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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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/*-----------------------------------------------------------*/
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/* One task per segment of the left side display. */
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#define ledNUM_OF_LED_TASKS ( 7 )
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/* Each task toggles at a frequency that is a multiple of 333ms. */
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#define ledFLASH_RATE_BASE ( ( TickType_t ) 333 )
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/*-----------------------------------------------------------*/
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/* The task that is created 7 times. */
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static void vLEDFlashTask( void *pvParameters );
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/* Handles to each of the 7 tasks. Used so the tasks can be suspended
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and resumed. */
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static TaskHandle_t xFlashTaskHandles[ ledNUM_OF_LED_TASKS ] = { 0 };
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/*-----------------------------------------------------------*/
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/**
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* Creates the tasks used to toggle the segments of the left
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* seven segment display, as described at the top of main.c
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*/
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void vCreateFlashTasks( void )
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{
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signed short sLEDTask;
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/* Create the tasks that flash segments on the first LED. */
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for( sLEDTask = 0; sLEDTask < ledNUM_OF_LED_TASKS; ++sLEDTask )
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{
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/* Spawn the task. */
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xTaskCreate( vLEDFlashTask, "LEDt", configMINIMAL_STACK_SIZE, ( void * ) sLEDTask, ( tskIDLE_PRIORITY + 1 ), &( xFlashTaskHandles[ sLEDTask ] ) );
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}
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}
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/*-----------------------------------------------------------*/
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void vSuspendFlashTasks( unsigned char ucIndex, short sSuspendTasks )
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{
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short sLEDTask;
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if( ucIndex == configLEFT_DISPLAY )
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{
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/* Suspend or resume the tasks that are toggling the segments of the
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left side display. */
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for( sLEDTask = 0; sLEDTask < ledNUM_OF_LED_TASKS; ++sLEDTask )
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{
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if( xFlashTaskHandles[ sLEDTask ] != NULL )
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{
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if( sSuspendTasks == pdTRUE )
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{
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vTaskSuspend( xFlashTaskHandles[ sLEDTask ] );
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}
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else
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{
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vTaskResume( xFlashTaskHandles[ sLEDTask ] );
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}
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}
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}
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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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TickType_t xFlashRate, xLastFlashTime;
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unsigned short usLED;
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/* The LED to flash is passed in as the task parameter. */
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usLED = ( unsigned short ) pvParameters;
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/* Calculate the rate at which this task is going to toggle its LED. */
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xFlashRate = ledFLASH_RATE_BASE + ( ledFLASH_RATE_BASE * ( TickType_t ) usLED );
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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( usLED );
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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( usLED );
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}
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}
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/*-----------------------------------------------------------*/
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