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[/] [openrisc/] [trunk/] [rtos/] [freertos-6.1.1/] [Demo/] [Common/] [Minimal/] [crflash.c] - Blame information for rev 606

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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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 * This demo application file demonstrates the use of queues to pass data
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 * between co-routines.
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 *
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 * N represents the number of 'fixed delay' co-routines that are created and
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 * is set during initialisation.
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 *
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 * N 'fixed delay' co-routines are created that just block for a fixed
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 * period then post the number of an LED onto a queue.  Each such co-routine
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 * uses a different block period.  A single 'flash' co-routine is also created
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 * that blocks on the same queue, waiting for the number of the next LED it
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 * should flash.  Upon receiving a number it simply toggle the instructed LED
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 * then blocks on the queue once more.  In this manner each LED from LED 0 to
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 * LED N-1 is caused to flash at a different rate.
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 *
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 * The 'fixed delay' co-routines are created with co-routine priority 0.  The
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 * flash co-routine is created with co-routine priority 1.  This means that
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 * the queue should never contain more than a single item.  This is because
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 * posting to the queue will unblock the 'flash' co-routine, and as this has
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 * a priority greater than the tasks posting to the queue it is guaranteed to
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 * have emptied the queue and blocked once again before the queue can contain
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 * any more date.  An error is indicated if an attempt to post data to the
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 * queue fails - indicating that the queue is already full.
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 *
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 */
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/* Scheduler includes. */
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#include "FreeRTOS.h"
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#include "croutine.h"
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#include "queue.h"
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/* Demo application includes. */
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#include "partest.h"
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#include "crflash.h"
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/* The queue should only need to be of length 1.  See the description at the
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top of the file. */
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#define crfQUEUE_LENGTH         1
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#define crfFIXED_DELAY_PRIORITY         0
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#define crfFLASH_PRIORITY                       1
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/* Only one flash co-routine is created so the index is not significant. */
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#define crfFLASH_INDEX                          0
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/* Don't allow more than crfMAX_FLASH_TASKS 'fixed delay' co-routines to be
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created. */
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#define crfMAX_FLASH_TASKS                      8
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/* We don't want to block when posting to the queue. */
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#define crfPOSTING_BLOCK_TIME           0
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/*
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 * The 'fixed delay' co-routine as described at the top of the file.
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 */
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static void prvFixedDelayCoRoutine( xCoRoutineHandle xHandle, unsigned portBASE_TYPE uxIndex );
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/*
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 * The 'flash' co-routine as described at the top of the file.
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 */
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static void prvFlashCoRoutine( xCoRoutineHandle xHandle, unsigned portBASE_TYPE uxIndex );
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/* The queue used to pass data between the 'fixed delay' co-routines and the
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'flash' co-routine. */
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static xQueueHandle xFlashQueue;
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/* This will be set to pdFALSE if we detect an error. */
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static portBASE_TYPE xCoRoutineFlashStatus = pdPASS;
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/*-----------------------------------------------------------*/
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/*
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 * See the header file for details.
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 */
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void vStartFlashCoRoutines( unsigned portBASE_TYPE uxNumberToCreate )
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{
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unsigned portBASE_TYPE uxIndex;
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        if( uxNumberToCreate > crfMAX_FLASH_TASKS )
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        {
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                uxNumberToCreate = crfMAX_FLASH_TASKS;
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        }
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        /* Create the queue used to pass data between the co-routines. */
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        xFlashQueue = xQueueCreate( crfQUEUE_LENGTH, sizeof( unsigned portBASE_TYPE ) );
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        if( xFlashQueue )
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        {
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                /* Create uxNumberToCreate 'fixed delay' co-routines. */
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                for( uxIndex = 0; uxIndex < uxNumberToCreate; uxIndex++ )
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                {
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                        xCoRoutineCreate( prvFixedDelayCoRoutine, crfFIXED_DELAY_PRIORITY, uxIndex );
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                }
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                /* Create the 'flash' co-routine. */
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                xCoRoutineCreate( prvFlashCoRoutine, crfFLASH_PRIORITY, crfFLASH_INDEX );
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        }
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}
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/*-----------------------------------------------------------*/
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static void prvFixedDelayCoRoutine( xCoRoutineHandle xHandle, unsigned portBASE_TYPE uxIndex )
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{
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/* Even though this is a co-routine the xResult variable does not need to be
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static as we do not need it to maintain its state between blocks. */
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signed portBASE_TYPE xResult;
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/* The uxIndex parameter of the co-routine function is used as an index into
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the xFlashRates array to obtain the delay period to use. */
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static const portTickType xFlashRates[ crfMAX_FLASH_TASKS ] = { 150 / portTICK_RATE_MS,
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                                                                                                                                200 / portTICK_RATE_MS,
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                                                                                                                                250 / portTICK_RATE_MS,
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                                                                                                                                300 / portTICK_RATE_MS,
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                                                                                                                                350 / portTICK_RATE_MS,
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                                                                                                                                400 / portTICK_RATE_MS,
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                                                                                                                                450 / portTICK_RATE_MS,
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                                                                                                                                500  / portTICK_RATE_MS };
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        /* Co-routines MUST start with a call to crSTART. */
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        crSTART( xHandle );
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        for( ;; )
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        {
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                /* Post our uxIndex value onto the queue.  This is used as the LED to
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                flash. */
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                crQUEUE_SEND( xHandle, xFlashQueue, ( void * ) &uxIndex, crfPOSTING_BLOCK_TIME, &xResult );
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                if( xResult != pdPASS )
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                {
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                        /* For the reasons stated at the top of the file we should always
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                        find that we can post to the queue.  If we could not then an error
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                        has occurred. */
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                        xCoRoutineFlashStatus = pdFAIL;
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                }
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                crDELAY( xHandle, xFlashRates[ uxIndex ] );
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        }
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        /* Co-routines MUST end with a call to crEND. */
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        crEND();
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}
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/*-----------------------------------------------------------*/
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static void prvFlashCoRoutine( xCoRoutineHandle xHandle, unsigned portBASE_TYPE uxIndex )
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{
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/* Even though this is a co-routine the variable do not need to be
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static as we do not need it to maintain their state between blocks. */
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signed portBASE_TYPE xResult;
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unsigned portBASE_TYPE uxLEDToFlash;
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        /* Co-routines MUST start with a call to crSTART. */
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        crSTART( xHandle );
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        ( void ) uxIndex;
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        for( ;; )
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        {
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                /* Block to wait for the number of the LED to flash. */
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                crQUEUE_RECEIVE( xHandle, xFlashQueue, &uxLEDToFlash, portMAX_DELAY, &xResult );
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                if( xResult != pdPASS )
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                {
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                        /* We would not expect to wake unless we received something. */
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                        xCoRoutineFlashStatus = pdFAIL;
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                }
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                else
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                {
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                        /* We received the number of an LED to flash - flash it! */
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                        vParTestToggleLED( uxLEDToFlash );
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                }
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        }
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        /* Co-routines MUST end with a call to crEND. */
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        crEND();
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}
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/*-----------------------------------------------------------*/
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portBASE_TYPE xAreFlashCoRoutinesStillRunning( void )
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{
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        /* Return pdPASS or pdFAIL depending on whether an error has been detected
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        or not. */
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        return xCoRoutineFlashStatus;
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}
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