You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
133 lines
5.1 KiB
C
133 lines
5.1 KiB
C
/*
|
|
FreeRTOS V7.0.2 - Copyright (C) 2011 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 http://www.FreeRTOS.org/Documentation 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
|
|
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. 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: http://www.freertos.org/a00114.html and also obtained
|
|
by writing to Richard Barry, contact details for whom are available on the
|
|
FreeRTOS WEB site.
|
|
|
|
1 tab == 4 spaces!
|
|
|
|
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 long.
|
|
*/
|
|
|
|
#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( char * ) );
|
|
}
|
|
/*-----------------------------------------------------------*/
|
|
|
|
void vPrintDisplayMessage( const char * const * ppcMessageToSend )
|
|
{
|
|
#ifdef USE_STDIO
|
|
xQueueSend( xPrintQueue, ( void * ) ppcMessageToSend, ( portTickType ) 0 );
|
|
#else
|
|
/* Stop warnings. */
|
|
( void ) ppcMessageToSend;
|
|
#endif
|
|
}
|
|
/*-----------------------------------------------------------*/
|
|
|
|
const char *pcPrintGetNextMessage( portTickType xPrintRate )
|
|
{
|
|
char *pcMessage;
|
|
|
|
if( xQueueReceive( xPrintQueue, &pcMessage, xPrintRate ) == pdPASS )
|
|
{
|
|
return pcMessage;
|
|
}
|
|
else
|
|
{
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
|