/* | |
FreeRTOS V9.0.1 - Copyright (C) 2017 Real Time Engineers Ltd. | |
All rights reserved | |
VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION. | |
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 on the following | |
link: http://www.freertos.org/a00114.html | |
*************************************************************************** | |
* * | |
* FreeRTOS provides completely free yet professionally developed, * | |
* robust, strictly quality controlled, supported, and cross * | |
* platform software that is more than just the market leader, it * | |
* is the industry's de facto standard. * | |
* * | |
* Help yourself get started quickly while simultaneously helping * | |
* to support the FreeRTOS project by purchasing a FreeRTOS * | |
* tutorial book, reference manual, or both: * | |
* http://www.FreeRTOS.org/Documentation * | |
* * | |
*************************************************************************** | |
http://www.FreeRTOS.org/FAQHelp.html - Having a problem? Start by reading | |
the FAQ page "My application does not run, what could be wrong?". Have you | |
defined configASSERT()? | |
http://www.FreeRTOS.org/support - In return for receiving this top quality | |
embedded software for free we request you assist our global community by | |
participating in the support forum. | |
http://www.FreeRTOS.org/training - Investing in training allows your team to | |
be as productive as possible as early as possible. Now you can receive | |
FreeRTOS training directly from Richard Barry, CEO of Real Time Engineers | |
Ltd, and the world's leading authority on the world's leading RTOS. | |
http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products, | |
including FreeRTOS+Trace - an indispensable productivity tool, a DOS | |
compatible FAT file system, and our tiny thread aware UDP/IP stack. | |
http://www.FreeRTOS.org/labs - Where new FreeRTOS products go to incubate. | |
Come and try FreeRTOS+TCP, our new open source TCP/IP stack for FreeRTOS. | |
http://www.OpenRTOS.com - Real Time Engineers ltd. license FreeRTOS to High | |
Integrity Systems ltd. to sell under the OpenRTOS brand. Low cost OpenRTOS | |
licenses offer ticketed support, indemnification and commercial middleware. | |
http://www.SafeRTOS.com - High Integrity Systems also provide a safety | |
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 UBaseType_t uxFlashTaskNumber = 0; | |
/* The task that is created three times. */ | |
static portTASK_FUNCTION_PROTO( vLEDFlashTask, pvParameters ); | |
/*-----------------------------------------------------------*/ | |
void vStartLEDFlashTasks( UBaseType_t uxPriority ) | |
{ | |
BaseType_t 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; | |
UBaseType_t 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. */ | |