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/*
FreeRTOS.org V5.1.1 - Copyright (C) 2003-2008 Richard Barry.
This file is part of the FreeRTOS.org distribution.
FreeRTOS.org is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
FreeRTOS.org 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
along with FreeRTOS.org; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
A special exception to the GPL can be applied should you wish to distribute
a combined work that includes FreeRTOS.org, without being obliged to provide
the source code for any proprietary components. See the licensing section
of http://www.FreeRTOS.org for full details of how and when the exception
can be applied.
***************************************************************************
***************************************************************************
* *
* SAVE TIME AND MONEY! We can port FreeRTOS.org to your own hardware, *
* and even write all or part of your application on your behalf. *
* See http://www.OpenRTOS.com for details of the services we provide to *
* expedite your project. *
* *
***************************************************************************
***************************************************************************
Please ensure to read the configuration and relevant port sections of the
online documentation.
http://www.FreeRTOS.org - Documentation, latest information, license and
contact details.
http://www.SafeRTOS.com - A version that is certified for use in safety
critical systems.
http://www.OpenRTOS.com - Commercial support, development, porting,
licensing and training services.
*/
/**
* Manages a queue of strings that are waiting to be displayed. This is used to
* ensure mutual exclusion of console output.
*
* A task wishing to display a message will call vPrintDisplayMessage (), with a
* pointer to the string as the parameter. The pointer is posted onto the
* xPrintQueue queue.
*
* The task spawned in main. c blocks on xPrintQueue. When a message becomes
* available it calls pcPrintGetNextMessage () to obtain a pointer to the next
* string, then uses the functions defined in the portable layer FileIO. c to
* display the message.
*
* <b>NOTE:</b>
* Using console IO can disrupt real time performance - depending on the port.
* Standard C IO routines are not designed for real time applications. While
* standard IO is useful for demonstration and debugging an alternative method
* should be used if you actually require console IO as part of your application.
*
* \page PrintC print.c
* \ingroup DemoFiles
* <HR>
*/
/*
Changes from V2.0.0
+ Delay periods are now specified using variables and constants of
portTickType rather than unsigned portLONG.
*/
#include <stdlib.h>
/* Scheduler include files. */
#include "FreeRTOS.h"
#include "queue.h"
/* Demo program include files. */
#include "print.h"
static xQueueHandle xPrintQueue;
/*-----------------------------------------------------------*/
void vPrintInitialise( void )
{
const unsigned portBASE_TYPE uxQueueSize = 20;
/* Create the queue on which errors will be reported. */
xPrintQueue = xQueueCreate( uxQueueSize, ( unsigned portBASE_TYPE ) sizeof( portCHAR * ) );
}
/*-----------------------------------------------------------*/
void vPrintDisplayMessage( const portCHAR * const * ppcMessageToSend )
{
#ifdef USE_STDIO
xQueueSend( xPrintQueue, ( void * ) ppcMessageToSend, ( portTickType ) 0 );
#else
/* Stop warnings. */
( void ) ppcMessageToSend;
#endif
}
/*-----------------------------------------------------------*/
const portCHAR *pcPrintGetNextMessage( portTickType xPrintRate )
{
portCHAR *pcMessage;
if( xQueueReceive( xPrintQueue, &pcMessage, xPrintRate ) == pdPASS )
{
return pcMessage;
}
else
{
return NULL;
}
}
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