Subversion Repositories openrisc

/*

    FreeRTOS V6.1.1 - Copyright (C) 2011 Real Time Engineers Ltd.

    ***************************************************************************

    *                                                                         *

    * If you are:                                                             *

    *                                                                         *

    *    + New to FreeRTOS,                                                   *

    *    + Wanting to learn FreeRTOS or multitasking in general quickly       *

    *    + Looking for basic training,                                        *

    *    + Wanting to improve your FreeRTOS skills and productivity           *

    *                                                                         *

    * then take a look at the FreeRTOS books - available as PDF or paperback  *

    *                                                                         *

    *        "Using the FreeRTOS Real Time Kernel - a Practical Guide"        *

    *                  http://www.FreeRTOS.org/Documentation                  *

    *                                                                         *

    * A pdf reference manual is also available.  Both are usually delivered   *

    * to your inbox within 20 minutes to two hours when purchased between 8am *

    * and 8pm GMT (although please allow up to 24 hours in case of            *

    * exceptional circumstances).  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 exception 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;

        }

}