129 lines
4.4 KiB
C
129 lines
4.4 KiB
C
/*
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* FreeRTOS Kernel V10.2.1
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* Copyright (C) 2019 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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* http://www.FreeRTOS.org
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* http://aws.amazon.com/freertos
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*
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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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