FreeRTOS-Kernel/FreeRTOS/Demo/Common/Minimal/QueueSetPolling.c

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*/

/*
 * Tests the use of queue sets.
 *
 * A receive task creates a number of queues and adds them to a queue set before
 * blocking on the queue set receive.  A transmit task and (optionally) an
 * interrupt repeatedly unblocks the receive task by sending messages to the
 * queues in a pseudo random order.  The receive task removes the messages from
 * the queues and flags an error if the received message does not match that
 * expected.  The task sends values in the range 0 to
 * queuesetINITIAL_ISR_TX_VALUE, and the ISR sends value in the range
 * queuesetINITIAL_ISR_TX_VALUE to ULONG_MAX.
 */


/* Standard includes. */
#include <stdlib.h>
#include <limits.h>

/* Kernel includes. */
#include "FreeRTOS.h"
#include "task.h"
#include "queue.h"

/* Demo includes. */
#include "QueueSetPolling.h"

/* The length of each created queue. */
#define setpollQUEUE_LENGTH	10

/* Block times used in this demo.  A block time or 0 means "don't block". */
#define setpollDONT_BLOCK 0

/* The ISR sends to the queue every setpollISR_TX_PERIOD ticks. */
#define queuesetISR_TX_PERIOD	( 50UL )

/*
 * The task that reads from the queue set.
 */
static void prvQueueSetReceivingTask( void *pvParameters );

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

/* The queue that is added to the set. */
static QueueHandle_t xQueue = NULL;

/* The handle of the queue set to which the queue is added. */
static QueueSetHandle_t xQueueSet = NULL;

/* Set to pdFAIL if an error is detected by any queue set task.
ulCycleCounter will only be incremented if xQueueSetTasksSatus equals pdPASS. */
static volatile BaseType_t xQueueSetPollStatus = pdPASS;

/* Counter used to ensure the task is still running. */
static uint32_t ulCycleCounter = 0;

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

void vStartQueueSetPollingTask( void )
{
	/* Create the queue that is added to the set, the set, and add the queue to
	the set. */
	xQueue = xQueueCreate( setpollQUEUE_LENGTH, sizeof( uint32_t ) );
	xQueueSet = xQueueCreateSet( setpollQUEUE_LENGTH );
	xQueueAddToSet( xQueue, xQueueSet );

	/* Create the task. */
	xTaskCreate( prvQueueSetReceivingTask, "SetPoll", configMINIMAL_STACK_SIZE, NULL, tskIDLE_PRIORITY, NULL );
}
/*-----------------------------------------------------------*/

static void prvQueueSetReceivingTask( void *pvParameters )
{
uint32_t ulReceived, ulExpected = 0;
QueueHandle_t xActivatedQueue;

	/* Remove compiler warnings. */
	( void ) pvParameters;

	for( ;; )
	{
		/* Is a message waiting?  A block time is not used to ensure the queue
		set is polled while it is being written to from an interrupt. */
		xActivatedQueue = xQueueSelectFromSet( xQueueSet, setpollDONT_BLOCK );

		if( xActivatedQueue != NULL )
		{
			/* Reading from the queue should pass with a zero block time as
			this task will only run when something has been posted to a task
			in the queue set. */
			if( xQueueReceive( xActivatedQueue, &ulReceived, setpollDONT_BLOCK ) != pdPASS )
			{
				xQueueSetPollStatus = pdFAIL;
			}

			if( ulReceived == ulExpected )
			{
				ulExpected++;
			}
			else
			{
				xQueueSetPollStatus = pdFAIL;
			}

			if( xQueueSetPollStatus == pdPASS )
			{
				ulCycleCounter++;
			}
		}
	}
}
/*-----------------------------------------------------------*/

void vQueueSetPollingInterruptAccess( void )
{
static uint32_t ulCallCount = 0, ulValueToSend = 0;

	/* It is intended that this function is called from the tick hook
	function, so each call is one tick period apart. */
	ulCallCount++;
	if( ulCallCount > queuesetISR_TX_PERIOD )
	{
		ulCallCount = 0;

		if( xQueueSendFromISR( xQueue, ( void * ) &ulValueToSend, NULL ) == pdPASS )
		{
			/* Send the next value next time. */
			ulValueToSend++;
		}
	}
}
/*-----------------------------------------------------------*/

BaseType_t xAreQueueSetPollTasksStillRunning( void )
{
static uint32_t ulLastCycleCounter = 0;

	if( ulLastCycleCounter == ulCycleCounter )
	{
		xQueueSetPollStatus = pdFAIL;
	}

	ulLastCycleCounter = ulCycleCounter;

	return xQueueSetPollStatus;
}
/*-----------------------------------------------------------*/