/*
    FreeRTOS V8.2.2 - Copyright (C) 2015 Real Time Engineers Ltd.
    All rights reserved

    VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.

    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 modification 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.  Full license text is available on the following
    link: http://www.freertos.org/a00114.html

    ***************************************************************************
     *                                                                       *
     *    FreeRTOS provides completely free yet professionally developed,    *
     *    robust, strictly quality controlled, supported, and cross          *
     *    platform software that is more than just the market leader, it     *
     *    is the industry's de facto standard.                               *
     *                                                                       *
     *    Help yourself get started quickly while simultaneously helping     *
     *    to support the FreeRTOS project by purchasing a FreeRTOS           *
     *    tutorial book, reference manual, or both:                          *
     *    http://www.FreeRTOS.org/Documentation                              *
     *                                                                       *
    ***************************************************************************

    http://www.FreeRTOS.org/FAQHelp.html - Having a problem?  Start by reading
    the FAQ page "My application does not run, what could be wrong?".  Have you
    defined configASSERT()?

    http://www.FreeRTOS.org/support - In return for receiving this top quality
    embedded software for free we request you assist our global community by
    participating in the support forum.

    http://www.FreeRTOS.org/training - Investing in training allows your team to
    be as productive as possible as early as possible.  Now you can receive
    FreeRTOS training directly from Richard Barry, CEO of Real Time Engineers
    Ltd, and the world's leading authority on the world's leading RTOS.

    http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
    including FreeRTOS+Trace - an indispensable productivity tool, a DOS
    compatible FAT file system, and our tiny thread aware UDP/IP stack.

    http://www.FreeRTOS.org/labs - Where new FreeRTOS products go to incubate.
    Come and try FreeRTOS+TCP, our new open source TCP/IP stack for FreeRTOS.

    http://www.OpenRTOS.com - Real Time Engineers ltd. license FreeRTOS to High
    Integrity Systems ltd. to sell under the OpenRTOS brand.  Low cost OpenRTOS
    licenses offer ticketed support, indemnification and commercial middleware.

    http://www.SafeRTOS.com - High Integrity Systems also provide a safety
    engineered and independently SIL3 certified version for use in safety and
    mission critical applications that require provable dependability.

    1 tab == 4 spaces!
*/


/**
 * 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
	  TickType_t 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 QueueHandle_t 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;
QueueHandle_t *pxQueue;
const TickType_t xDelay = ( TickType_t ) 200 / portTICK_PERIOD_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 = ( QueueHandle_t * ) pvParameters;

	for( ;; )
	{		
		for( usLoop = 0; usLoop < usNumToProduce; ++usLoop )
		{
			/* Send an incrementing number on the queue without blocking. */
			if( xQueueSendToBack( *pxQueue, ( void * ) &usValue, ( TickType_t ) 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;
QueueHandle_t *pxQueue;
const TickType_t xDelay = ( TickType_t ) 200 / portTICK_PERIOD_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 = ( QueueHandle_t * ) pvParameters;

	for( ;; )
	{		
		/* Loop until the queue is empty. */
		while( uxQueueMessagesWaiting( *pxQueue ) )
		{
			if( xQueueReceive( *pxQueue, &usData, ( TickType_t ) 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;
}