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[/] [openrisc/] [trunk/] [rtos/] [freertos-6.1.1/] [Demo/] [Common/] [Full/] [print.c] - Blame information for rev 609

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1 606 jeremybenn
/*
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    FreeRTOS V6.1.1 - Copyright (C) 2011 Real Time Engineers Ltd.
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    ***************************************************************************
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    *                                                                         *
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    * If you are:                                                             *
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    *                                                                         *
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    *    + New to FreeRTOS,                                                   *
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    *    + Wanting to learn FreeRTOS or multitasking in general quickly       *
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    *    + Looking for basic training,                                        *
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    *    + Wanting to improve your FreeRTOS skills and productivity           *
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    *                                                                         *
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    * then take a look at the FreeRTOS books - available as PDF or paperback  *
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    *                                                                         *
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    *        "Using the FreeRTOS Real Time Kernel - a Practical Guide"        *
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    *                  http://www.FreeRTOS.org/Documentation                  *
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    *                                                                         *
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    * A pdf reference manual is also available.  Both are usually delivered   *
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    * to your inbox within 20 minutes to two hours when purchased between 8am *
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    * and 8pm GMT (although please allow up to 24 hours in case of            *
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    * exceptional circumstances).  Thank you for your support!                *
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    *                                                                         *
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    ***************************************************************************
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    This file is part of the FreeRTOS distribution.
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    FreeRTOS is free software; you can redistribute it and/or modify it under
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    the terms of the GNU General Public License (version 2) as published by the
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    Free Software Foundation AND MODIFIED BY the FreeRTOS exception.
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    ***NOTE*** The exception to the GPL is included to allow you to distribute
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    a combined work that includes FreeRTOS without being obliged to provide the
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    source code for proprietary components outside of the FreeRTOS kernel.
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    FreeRTOS is distributed in the hope that it will be useful, but WITHOUT
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    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
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    more details. You should have received a copy of the GNU General Public
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    License and the FreeRTOS license exception along with FreeRTOS; if not it
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    can be viewed here: http://www.freertos.org/a00114.html and also obtained
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    by writing to Richard Barry, contact details for whom are available on the
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    FreeRTOS WEB site.
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    1 tab == 4 spaces!
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    http://www.FreeRTOS.org - Documentation, latest information, license and
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    contact details.
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    http://www.SafeRTOS.com - A version that is certified for use in safety
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    critical systems.
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    http://www.OpenRTOS.com - Commercial support, development, porting,
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    licensing and training services.
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*/
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/**
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 * Manages a queue of strings that are waiting to be displayed.  This is used to
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 * ensure mutual exclusion of console output.
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 *
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 * A task wishing to display a message will call vPrintDisplayMessage (), with a
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 * pointer to the string as the parameter. The pointer is posted onto the
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 * xPrintQueue queue.
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 *
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 * The task spawned in main. c blocks on xPrintQueue.  When a message becomes
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 * available it calls pcPrintGetNextMessage () to obtain a pointer to the next
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 * string, then uses the functions defined in the portable layer FileIO. c to
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 * display the message.
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 *
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 * <b>NOTE:</b>
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 * Using console IO can disrupt real time performance - depending on the port.
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 * Standard C IO routines are not designed for real time applications.  While
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 * standard IO is useful for demonstration and debugging an alternative method
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 * should be used if you actually require console IO as part of your application.
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 *
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 * \page PrintC print.c
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 * \ingroup DemoFiles
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 * <HR>
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 */
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/*
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Changes from V2.0.0
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        + Delay periods are now specified using variables and constants of
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          portTickType rather than unsigned long.
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*/
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#include <stdlib.h>
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/* Scheduler include files. */
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#include "FreeRTOS.h"
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#include "queue.h"
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/* Demo program include files. */
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#include "print.h"
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static xQueueHandle xPrintQueue;
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/*-----------------------------------------------------------*/
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void vPrintInitialise( void )
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{
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const unsigned portBASE_TYPE uxQueueSize = 20;
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        /* Create the queue on which errors will be reported. */
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        xPrintQueue = xQueueCreate( uxQueueSize, ( unsigned portBASE_TYPE ) sizeof( char * ) );
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}
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/*-----------------------------------------------------------*/
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void vPrintDisplayMessage( const char * const * ppcMessageToSend )
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{
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        #ifdef USE_STDIO
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                xQueueSend( xPrintQueue, ( void * ) ppcMessageToSend, ( portTickType ) 0 );
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        #else
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        /* Stop warnings. */
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                ( void ) ppcMessageToSend;
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        #endif
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}
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/*-----------------------------------------------------------*/
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const char *pcPrintGetNextMessage( portTickType xPrintRate )
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{
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char *pcMessage;
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        if( xQueueReceive( xPrintQueue, &pcMessage, xPrintRate ) == pdPASS )
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        {
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                return pcMessage;
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        }
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        else
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        {
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                return NULL;
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        }
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}
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