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/*

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

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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.

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    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

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    more details. You should have received a copy of the GNU General Public

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*/

/**

 * This is a very simple queue test.  See the BlockQ. c documentation for a more

 * comprehensive version.

 *

 * Creates two tasks that communicate over a single queue.  One task acts as a

 * producer, the other a consumer.

 *

 * The producer loops for three iteration, posting an incrementing number onto the

 * queue each cycle.  It then delays for a fixed period before doing exactly the

 * same again.

 *

 * The consumer loops emptying the queue.  Each item removed from the queue is

 * checked to ensure it contains the expected value.  When the queue is empty it

 * blocks for a fixed period, then does the same again.

 *

 * All queue access is performed without blocking.  The consumer completely empties

 * the queue each time it runs so the producer should never find the queue full.

 *

 * An error is flagged if the consumer obtains an unexpected value or the producer

 * find the queue is full.

 *

 * \page PollQC pollQ.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 "task.h"

#include "queue.h"

#include "print.h"

/* Demo program include files. */

#include "PollQ.h"

#define pollqSTACK_SIZE         ( ( unsigned short ) configMINIMAL_STACK_SIZE )

/* The task that posts the incrementing number onto the queue. */

static void vPolledQueueProducer( void *pvParameters );

/* The task that empties the queue. */

static void vPolledQueueConsumer( void *pvParameters );

/* Variables that are used to check that the tasks are still running with no errors. */

static volatile short sPollingConsumerCount = 0, sPollingProducerCount = 0;

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

void vStartPolledQueueTasks( unsigned portBASE_TYPE uxPriority )

{

static xQueueHandle xPolledQueue;

const unsigned portBASE_TYPE uxQueueSize = 10;

        /* Create the queue used by the producer and consumer. */

        xPolledQueue = xQueueCreate( uxQueueSize, ( unsigned portBASE_TYPE ) sizeof( unsigned short ) );

        /* Spawn the producer and consumer. */

        xTaskCreate( vPolledQueueConsumer, "QConsNB", pollqSTACK_SIZE, ( void * ) &xPolledQueue, uxPriority, NULL );

        xTaskCreate( vPolledQueueProducer, "QProdNB", pollqSTACK_SIZE, ( void * ) &xPolledQueue, uxPriority, NULL );

}

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

static void vPolledQueueProducer( void *pvParameters )

{

unsigned short usValue = 0, usLoop;

xQueueHandle *pxQueue;

const portTickType xDelay = ( portTickType ) 200 / portTICK_RATE_MS;

const unsigned short usNumToProduce = 3;

const char * const pcTaskStartMsg = "Polled queue producer started.\r\n";

const char * const pcTaskErrorMsg = "Could not post on polled queue.\r\n";

short sError = pdFALSE;

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

        vPrintDisplayMessage( &pcTaskStartMsg );

        /* The queue being used is passed in as the parameter. */

        pxQueue = ( xQueueHandle * ) pvParameters;

        for( ;; )

        {

                for( usLoop = 0; usLoop < usNumToProduce; ++usLoop )

                {

                        /* Send an incrementing number on the queue without blocking. */

                        if( xQueueSendToBack( *pxQueue, ( void * ) &usValue, ( portTickType ) 0 ) != pdPASS )

                        {

                                /* We should never find the queue full - this is an error. */

                                vPrintDisplayMessage( &pcTaskErrorMsg );

                                sError = pdTRUE;

                        }

                        else

                        {

                                if( sError == pdFALSE )

                                {

                                        /* If an error has ever been recorded we stop incrementing the

                                        check variable. */

                                        ++sPollingProducerCount;

                                }

                                /* Update the value we are going to post next time around. */

                                ++usValue;

                        }

                }

                /* Wait before we start posting again to ensure the consumer runs and

                empties the queue. */

                vTaskDelay( xDelay );

        }

}

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

static void vPolledQueueConsumer( void *pvParameters )

{

unsigned short usData, usExpectedValue = 0;

xQueueHandle *pxQueue;

const portTickType xDelay = ( portTickType ) 200 / portTICK_RATE_MS;

const char * const pcTaskStartMsg = "Polled queue consumer started.\r\n";

const char * const pcTaskErrorMsg = "Incorrect value received on polled queue.\r\n";

short sError = pdFALSE;

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

        vPrintDisplayMessage( &pcTaskStartMsg );

        /* The queue being used is passed in as the parameter. */

        pxQueue = ( xQueueHandle * ) pvParameters;

        for( ;; )

        {

                /* Loop until the queue is empty. */

                while( uxQueueMessagesWaiting( *pxQueue ) )

                {

                        if( xQueueReceive( *pxQueue, &usData, ( portTickType ) 0 ) == pdPASS )

                        {

                                if( usData != usExpectedValue )

                                {

                                        /* This is not what we expected to receive so an error has

                                        occurred. */

                                        vPrintDisplayMessage( &pcTaskErrorMsg );

                                        sError = pdTRUE;

                                        /* Catch-up to the value we received so our next expected value

                                        should again be correct. */

                                        usExpectedValue = usData;

                                }

                                else

                                {

                                        if( sError == pdFALSE )

                                        {

                                                /* Only increment the check variable if no errors have

                                                occurred. */

                                                ++sPollingConsumerCount;

                                        }

                                }

                                ++usExpectedValue;

                        }

                }

                /* Now the queue is empty we block, allowing the producer to place more

                items in the queue. */

                vTaskDelay( xDelay );

        }

}

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

/* This is called to check that all the created tasks are still running with no errors. */

portBASE_TYPE xArePollingQueuesStillRunning( void )

{

static short sLastPollingConsumerCount = 0, sLastPollingProducerCount = 0;

portBASE_TYPE xReturn;

        if( ( sLastPollingConsumerCount == sPollingConsumerCount ) ||

                ( sLastPollingProducerCount == sPollingProducerCount )

          )

        {

                xReturn = pdFALSE;

        }

        else

        {

                xReturn = pdTRUE;

        }

        sLastPollingConsumerCount = sPollingConsumerCount;

        sLastPollingProducerCount = sPollingProducerCount;

        return xReturn;

}