Subversion Repositories openrisc_2011-10-31

/*

    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       *

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    *                                                                         *

    * 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            *

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    *                                                                         *

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

    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.

*/

/**

 * Creates eight tasks, each of which flash an LED at a different rate.  The first

 * LED flashes every 125ms, the second every 250ms, the third every 375ms, etc.

 *

 * The LED flash tasks provide instant visual feedback.  They show that the scheduler

 * is still operational.

 *

 * The PC port uses the standard parallel port for outputs, the Flashlite 186 port

 * uses IO port F.

 *

 * \page flashC flash.c

 * \ingroup DemoFiles

 * <HR>

 */

/*

Changes from V2.0.0

        + Delay periods are now specified using variables and constants of

          portTickType rather than unsigned long.

Changes from V2.1.1

        + The stack size now uses configMINIMAL_STACK_SIZE.

        + String constants made file scope to decrease stack depth on 8051 port.

*/

#include <stdlib.h>

/* Scheduler include files. */

#include "FreeRTOS.h"

#include "task.h"

/* Demo program include files. */

#include "partest.h"

#include "flash.h"

#include "print.h"

#define ledSTACK_SIZE           configMINIMAL_STACK_SIZE

/* Structure used to pass parameters to the LED tasks. */

typedef struct LED_PARAMETERS

{

        unsigned portBASE_TYPE uxLED;           /*< The output the task should use. */

        portTickType xFlashRate;        /*< The rate at which the LED should flash. */

} xLEDParameters;

/* The task that is created eight times - each time with a different xLEDParaemtes

structure passed in as the parameter. */

static void vLEDFlashTask( void *pvParameters );

/* String to print if USE_STDIO is defined. */

const char * const pcTaskStartMsg = "LED flash task started.\r\n";

/*-----------------------------------------------------------*/

void vStartLEDFlashTasks( unsigned portBASE_TYPE uxPriority )

{

unsigned portBASE_TYPE uxLEDTask;

xLEDParameters *pxLEDParameters;

const unsigned portBASE_TYPE uxNumOfLEDs = 8;

const portTickType xFlashRate = 125;

        /* Create the eight tasks. */

        for( uxLEDTask = 0; uxLEDTask < uxNumOfLEDs; ++uxLEDTask )

        {

                /* Create and complete the structure used to pass parameters to the next

                created task. */

                pxLEDParameters = ( xLEDParameters * ) pvPortMalloc( sizeof( xLEDParameters ) );

                pxLEDParameters->uxLED = uxLEDTask;

                pxLEDParameters->xFlashRate = ( xFlashRate + ( xFlashRate * ( portTickType ) uxLEDTask ) );

                pxLEDParameters->xFlashRate /= portTICK_RATE_MS;

                /* Spawn the task. */

                xTaskCreate( vLEDFlashTask, "LEDx", ledSTACK_SIZE, ( void * ) pxLEDParameters, uxPriority, ( xTaskHandle * ) NULL );

        }

}

/*-----------------------------------------------------------*/

static void vLEDFlashTask( void *pvParameters )

{

xLEDParameters *pxParameters;

        /* Queue a message for printing to say the task has started. */

        vPrintDisplayMessage( &pcTaskStartMsg );

        pxParameters = ( xLEDParameters * ) pvParameters;

        for(;;)

        {

                /* Delay for half the flash period then turn the LED on. */

                vTaskDelay( pxParameters->xFlashRate / ( portTickType ) 2 );

                vParTestToggleLED( pxParameters->uxLED );

                /* Delay for half the flash period then turn the LED off. */

                vTaskDelay( pxParameters->xFlashRate / ( portTickType ) 2 );

                vParTestToggleLED( pxParameters->uxLED );

        }

}