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267 lines
9.8 KiB
C
267 lines
9.8 KiB
C
/*
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FreeRTOS V8.2.0 - 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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* Defines the tasks and co-routines used to toggle the segments of the two
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* seven segment displays, 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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#include "croutine.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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/* One co-routine per segment of the right hand display. */
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#define ledNUM_OF_LED_CO_ROUTINES 7
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/* All co-routines run at the same priority. */
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#define ledCO_ROUTINE_PRIORITY 0
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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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/* The co-routine that is created 7 times. */
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static void prvFixedDelayCoRoutine( CoRoutineHandle_t xHandle, unsigned short usIndex );
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/* This task is created once, but itself creates 7 co-routines. */
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static void vLEDCoRoutineControlTask( 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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/* Handle to the task in which the co-routines run. Used so the
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co-routines can be suspended and resumed. */
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static TaskHandle_t xCoroutineTask;
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/*-----------------------------------------------------------*/
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/**
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* Creates the tasks and co-routines used to toggle the segments of the two
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* seven segment displays, as described at the top of main.c
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*/
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void vCreateFlashTasksAndCoRoutines( 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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/* Create the task in which the co-routines run. The co-routines themselves
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are created within the task. */
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xTaskCreate( vLEDCoRoutineControlTask, "LEDc", configMINIMAL_STACK_SIZE, NULL, tskIDLE_PRIORITY, &xCoroutineTask );
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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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else
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{
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/* Suspend or resume the task in which the co-routines are running. The
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co-routines toggle the segments of the right side display. */
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if( sSuspendTasks == pdTRUE )
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{
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vTaskSuspend( xCoroutineTask );
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}
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else
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{
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vTaskResume( xCoroutineTask );
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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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static void vLEDCoRoutineControlTask( void *pvParameters )
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{
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unsigned short usCoroutine;
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( void ) pvParameters;
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/* Create the co-routines - one of each segment of the right side display. */
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for( usCoroutine = 0; usCoroutine < ledNUM_OF_LED_CO_ROUTINES; usCoroutine++ )
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{
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xCoRoutineCreate( prvFixedDelayCoRoutine, ledCO_ROUTINE_PRIORITY, usCoroutine );
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}
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/* This task has nothing else to do except scheduler the co-routines it just
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created. */
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for( ;; )
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{
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vCoRoutineSchedule();
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}
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}
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/*-----------------------------------------------------------*/
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static void prvFixedDelayCoRoutine( CoRoutineHandle_t xHandle, unsigned short usIndex )
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{
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/* The usIndex parameter of the co-routine function is used as an index into
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the xFlashRates array to obtain the delay period to use. */
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static const TickType_t xFlashRates[ ledNUM_OF_LED_CO_ROUTINES ] = { 150 / portTICK_PERIOD_MS,
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300 / portTICK_PERIOD_MS,
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450 / portTICK_PERIOD_MS,
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600 / portTICK_PERIOD_MS,
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750 / portTICK_PERIOD_MS,
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900 / portTICK_PERIOD_MS,
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1050 / portTICK_PERIOD_MS };
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/* Co-routines MUST start with a call to crSTART. */
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crSTART( xHandle );
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for( ;; )
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{
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/* Toggle the LED. An offset of 8 is used to skip over the segments of
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the left side display which use the low numbers. */
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vParTestToggleLED( usIndex + 8 );
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/* Delay until it is time to toggle the segment that this co-routine is
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controlling again. */
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crDELAY( xHandle, xFlashRates[ usIndex ] );
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}
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/* Co-routines MUST end with a call to crEND. */
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crEND();
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}
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/*-----------------------------------------------------------*/
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