| /* | |
| FreeRTOS V8.0.1 - Copyright (C) 2014 Real Time Engineers Ltd. | |
| All rights reserved | |
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| *************************************************************************** | |
| * * | |
| * FreeRTOS provides completely free yet professionally developed, * | |
| * robust, strictly quality controlled, supported, and cross * | |
| * platform software that has become a de facto standard. * | |
| * * | |
| * Help yourself get started quickly and support the FreeRTOS * | |
| * project by purchasing a FreeRTOS tutorial book, reference * | |
| * manual, or both from: http://www.FreeRTOS.org/Documentation * | |
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| * Thank you! * | |
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| *************************************************************************** | |
| This file is part of the FreeRTOS distribution. | |
| FreeRTOS is free software; you can redistribute it and/or modify it under | |
| the terms of the GNU General Public License (version 2) as published by the | |
| Free Software Foundation >>!AND MODIFIED BY!<< the FreeRTOS exception. | |
| >>! NOTE: The modification to the GPL is included to allow you to !<< | |
| >>! distribute a combined work that includes FreeRTOS without being !<< | |
| >>! obliged to provide the source code for proprietary components !<< | |
| >>! outside of the FreeRTOS kernel. !<< | |
| FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY | |
| WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS | |
| FOR A PARTICULAR PURPOSE. Full license text is available from the following | |
| link: http://www.freertos.org/a00114.html | |
| 1 tab == 4 spaces! | |
| *************************************************************************** | |
| * * | |
| * Having a problem? Start by reading the FAQ "My application does * | |
| * not run, what could be wrong?" * | |
| * * | |
| * http://www.FreeRTOS.org/FAQHelp.html * | |
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| *************************************************************************** | |
| http://www.FreeRTOS.org - Documentation, books, training, latest versions, | |
| license and Real Time Engineers Ltd. contact details. | |
| http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products, | |
| including FreeRTOS+Trace - an indispensable productivity tool, a DOS | |
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| engineered and independently SIL3 certified version for use in safety and | |
| mission critical applications that require provable dependability. | |
| 1 tab == 4 spaces! | |
| */ | |
| /** | |
| * This version of flash .c is for use on systems that have limited stack space | |
| * and no display facilities. The complete version can be found in the | |
| * Demo/Common/Full directory. | |
| * | |
| * Three tasks are created, each of which flash an LED at a different rate. The first | |
| * LED flashes every 200ms, the second every 400ms, the third every 600ms. | |
| * | |
| * The LED flash tasks provide instant visual feedback. They show that the scheduler | |
| * is still operational. | |
| * | |
| */ | |
| #include <stdlib.h> | |
| /* Scheduler include files. */ | |
| #include "FreeRTOS.h" | |
| #include "task.h" | |
| /* Demo program include files. */ | |
| #include "partest.h" | |
| #include "flash.h" | |
| #define ledSTACK_SIZE configMINIMAL_STACK_SIZE | |
| #define ledNUMBER_OF_LEDS ( 3 ) | |
| #define ledFLASH_RATE_BASE ( ( TickType_t ) 333 ) | |
| /* Variable used by the created tasks to calculate the LED number to use, and | |
| the rate at which they should flash the LED. */ | |
| static volatile unsigned portBASE_TYPE uxFlashTaskNumber = 0; | |
| /* The task that is created three times. */ | |
| static portTASK_FUNCTION_PROTO( vLEDFlashTask, pvParameters ); | |
| /*-----------------------------------------------------------*/ | |
| void vStartLEDFlashTasks( unsigned portBASE_TYPE uxPriority ) | |
| { | |
| signed portBASE_TYPE xLEDTask; | |
| /* Create the three tasks. */ | |
| for( xLEDTask = 0; xLEDTask < ledNUMBER_OF_LEDS; ++xLEDTask ) | |
| { | |
| /* Spawn the task. */ | |
| xTaskCreate( vLEDFlashTask, "LEDx", ledSTACK_SIZE, NULL, uxPriority, ( TaskHandle_t * ) NULL ); | |
| } | |
| } | |
| /*-----------------------------------------------------------*/ | |
| static portTASK_FUNCTION( vLEDFlashTask, pvParameters ) | |
| { | |
| TickType_t xFlashRate, xLastFlashTime; | |
| unsigned portBASE_TYPE uxLED; | |
| /* The parameters are not used. */ | |
| ( void ) pvParameters; | |
| /* Calculate the LED and flash rate. */ | |
| portENTER_CRITICAL(); | |
| { | |
| /* See which of the eight LED's we should use. */ | |
| uxLED = uxFlashTaskNumber; | |
| /* Update so the next task uses the next LED. */ | |
| uxFlashTaskNumber++; | |
| } | |
| portEXIT_CRITICAL(); | |
| xFlashRate = ledFLASH_RATE_BASE + ( ledFLASH_RATE_BASE * ( TickType_t ) uxLED ); | |
| xFlashRate /= portTICK_PERIOD_MS; | |
| /* We will turn the LED on and off again in the delay period, so each | |
| delay is only half the total period. */ | |
| xFlashRate /= ( TickType_t ) 2; | |
| /* We need to initialise xLastFlashTime prior to the first call to | |
| vTaskDelayUntil(). */ | |
| xLastFlashTime = xTaskGetTickCount(); | |
| for(;;) | |
| { | |
| /* Delay for half the flash period then turn the LED on. */ | |
| vTaskDelayUntil( &xLastFlashTime, xFlashRate ); | |
| vParTestToggleLED( uxLED ); | |
| /* Delay for half the flash period then turn the LED off. */ | |
| vTaskDelayUntil( &xLastFlashTime, xFlashRate ); | |
| vParTestToggleLED( uxLED ); | |
| } | |
| } /*lint !e715 !e818 !e830 Function definition must be standard for task creation. */ | |