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FreeRTOS V7.4.1 - Copyright (C) 2013 Real Time Engineers Ltd.
* *
* FreeRTOS tutorial books are available in pdf and paperback. *
* Complete, revised, and edited pdf reference manuals are also *
* available. *
* *
* Purchasing FreeRTOS documentation will not only help you, by *
* ensuring you get running as quickly as possible and with an *
* in-depth knowledge of how to use FreeRTOS, it will also help *
* the FreeRTOS project to continue with its mission of providing *
* professional grade, cross platform, de facto standard solutions *
* for microcontrollers - completely free of charge! *
* *
* >>> See for details. <<< *
* *
* Thank you for using FreeRTOS, and thank you for your support! *
* *
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
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. See the GNU General Public License for more
details. You should have received a copy of the GNU General Public License
and the FreeRTOS license exception along with FreeRTOS; if not it can be
viewed here: and also obtained by
writing to Real Time Engineers Ltd., contact details for whom are available
on the FreeRTOS WEB site.
1 tab == 4 spaces!
* *
* Having a problem? Start by reading the FAQ "My application does *
* not run, what could be wrong?" *
* *
* *
* *
*************************************************************************** - Documentation, books, training, latest versions,
license and Real Time Engineers Ltd. contact details. - A selection of FreeRTOS ecosystem products,
including FreeRTOS+Trace - an indispensable productivity tool, and our new
fully thread aware and reentrant UDP/IP stack. - Real Time Engineers ltd license FreeRTOS to High
Integrity Systems, who sell the code with commercial support,
indemnification and middleware, under the OpenRTOS brand. - 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.
* Repeatedly toggles one or more LEDs using software timers - one timer per
* LED.
/* Scheduler include files. */
#include "FreeRTOS.h"
#include "timers.h"
/* Demo program include files. */
#include "partest.h"
#include "flash_timer.h"
/* The toggle rates are all a multple of ledFLASH_RATE_BASE. */
#define ledFLASH_RATE_BASE ( ( ( portTickType ) 333 ) / portTICK_RATE_MS )
/* A block time of zero simple means "don't block". */
#define ledDONT_BLOCK ( ( portTickType ) 0 )
* The callback function used by each LED flashing timer. All the timers use
* this function, and the timer ID is used within the function to determine
* which timer has actually expired.
static void prvLEDTimerCallback( xTimerHandle xTimer );
void vStartLEDFlashTimers( unsigned portBASE_TYPE uxNumberOfLEDs )
unsigned portBASE_TYPE uxLEDTimer;
xTimerHandle xTimer;
/* Create and start the requested number of timers. */
for( uxLEDTimer = 0; uxLEDTimer < uxNumberOfLEDs; ++uxLEDTimer )
/* Create the timer. */
xTimer = xTimerCreate( ( const signed char * const ) "Flasher",/* A text name, purely to help debugging. */
ledFLASH_RATE_BASE * ( uxLEDTimer + 1 ), /* The timer period, which is a multiple of ledFLASH_RATE_BASE. */
pdTRUE, /* This is an auto-reload timer, so xAutoReload is set to pdTRUE. */
( void * ) uxLEDTimer, /* The ID is used to identify the timer within the timer callback function, as each timer uses the same callback. */
prvLEDTimerCallback /* Each timer uses the same callback. */
/* If the timer was created successfully, attempt to start it. If the
scheduler has not yet been started then the timer command queue must
be long enough to hold each command sent to it until such time that the
scheduler is started. The timer command queue length is set by
configTIMER_QUEUE_LENGTH in FreeRTOSConfig.h. */
if( xTimer != NULL )
xTimerStart( xTimer, ledDONT_BLOCK );
static void prvLEDTimerCallback( xTimerHandle xTimer )
portBASE_TYPE xTimerID;
/* The timer ID is used to identify the timer that has actually expired as
each timer uses the same callback. The ID is then also used as the number
of the LED that is to be toggled. */
xTimerID = ( portBASE_TYPE ) pvTimerGetTimerID( xTimer );
vParTestToggleLED( xTimerID );