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polyfractal 2016-12-30 18:23:32 -05:00
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/*
FreeRTOS V8.1.2 - Copyright (C) 2014 Real Time Engineers Ltd.
All rights reserved
VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.
***************************************************************************
* *
* 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 *
* *
* Thank you! *
* *
***************************************************************************
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 *
* *
***************************************************************************
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
compatible FAT file system, and our tiny thread aware UDP/IP stack.
http://www.OpenRTOS.com - Real Time Engineers ltd license FreeRTOS to High
Integrity Systems to sell under the OpenRTOS brand. Low cost OpenRTOS
licenses offer ticketed support, indemnification and 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!
*/
/**
* Creates eight tasks, each of which flash an LED at a different rate. The first
* LED flashes every 125ms, the second every 250ms, the third every 375ms, etc.
*
* The LED flash tasks provide instant visual feedback. They show that the scheduler
* is still operational.
*
* The PC port uses the standard parallel port for outputs, the Flashlite 186 port
* uses IO port F.
*
* \page flashC flash.c
* \ingroup DemoFiles
* <HR>
*/
/*
Changes from V2.0.0
+ Delay periods are now specified using variables and constants of
TickType_t rather than unsigned long.
Changes from V2.1.1
+ The stack size now uses configMINIMAL_STACK_SIZE.
+ String constants made file scope to decrease stack depth on 8051 port.
*/
#include <stdlib.h>
/* Scheduler include files. */
#include "FreeRTOS.h"
#include "task.h"
/* Demo program include files. */
#include "partest.h"
#include "flash.h"
#include "print.h"
#define ledSTACK_SIZE configMINIMAL_STACK_SIZE
/* Structure used to pass parameters to the LED tasks. */
typedef struct LED_PARAMETERS
{
unsigned portBASE_TYPE uxLED; /*< The output the task should use. */
TickType_t xFlashRate; /*< The rate at which the LED should flash. */
} xLEDParameters;
/* The task that is created eight times - each time with a different xLEDParaemtes
structure passed in as the parameter. */
static void vLEDFlashTask( void *pvParameters );
/* String to print if USE_STDIO is defined. */
const char * const pcTaskStartMsg = "LED flash task started.\r\n";
/*-----------------------------------------------------------*/
void vStartLEDFlashTasks( unsigned portBASE_TYPE uxPriority )
{
unsigned portBASE_TYPE uxLEDTask;
xLEDParameters *pxLEDParameters;
const unsigned portBASE_TYPE uxNumOfLEDs = 8;
const TickType_t xFlashRate = 125;
/* Create the eight tasks. */
for( uxLEDTask = 0; uxLEDTask < uxNumOfLEDs; ++uxLEDTask )
{
/* Create and complete the structure used to pass parameters to the next
created task. */
pxLEDParameters = ( xLEDParameters * ) pvPortMalloc( sizeof( xLEDParameters ) );
pxLEDParameters->uxLED = uxLEDTask;
pxLEDParameters->xFlashRate = ( xFlashRate + ( xFlashRate * ( TickType_t ) uxLEDTask ) );
pxLEDParameters->xFlashRate /= portTICK_PERIOD_MS;
/* Spawn the task. */
xTaskCreate( vLEDFlashTask, "LEDx", ledSTACK_SIZE, ( void * ) pxLEDParameters, uxPriority, ( TaskHandle_t * ) NULL );
}
}
/*-----------------------------------------------------------*/
static void vLEDFlashTask( void *pvParameters )
{
xLEDParameters *pxParameters;
/* Queue a message for printing to say the task has started. */
vPrintDisplayMessage( &pcTaskStartMsg );
pxParameters = ( xLEDParameters * ) pvParameters;
for(;;)
{
/* Delay for half the flash period then turn the LED on. */
vTaskDelay( pxParameters->xFlashRate / ( TickType_t ) 2 );
vParTestToggleLED( pxParameters->uxLED );
/* Delay for half the flash period then turn the LED off. */
vTaskDelay( pxParameters->xFlashRate / ( TickType_t ) 2 );
vParTestToggleLED( pxParameters->uxLED );
}
}