FreeRTOS-Kernel/FreeRTOS/Demo/MB96350_Softune_Dice_Kit/SegmentToggleTasks.c

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*/

/**
 * Defines the tasks and co-routines used to toggle the segments of the two
 * seven segment displays, as described at the top of main.c
 */


#include <stdlib.h>

/* Scheduler include files. */
#include "FreeRTOS.h"
#include "task.h"
#include "croutine.h"

/* Demo program include files. */
#include "partest.h"

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

/* One task per segment of the left side display. */
#define ledNUM_OF_LED_TASKS	( 7 )

/* Each task toggles at a frequency that is a multiple of 333ms. */
#define ledFLASH_RATE_BASE	( ( portTickType ) 333 )

/* One co-routine per segment of the right hand display. */
#define ledNUM_OF_LED_CO_ROUTINES	7

/* All co-routines run at the same priority. */
#define ledCO_ROUTINE_PRIORITY		0

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

/* The task that is created 7 times. */
static void vLEDFlashTask( void *pvParameters );

/* The co-routine that is created 7 times. */
static void prvFixedDelayCoRoutine( xCoRoutineHandle xHandle, unsigned short usIndex );

/* This task is created once, but itself creates 7 co-routines. */
static void vLEDCoRoutineControlTask( void *pvParameters );

/* Handles to each of the 7 tasks.  Used so the tasks can be suspended
and resumed. */
static xTaskHandle xFlashTaskHandles[ ledNUM_OF_LED_TASKS ] = { 0 };

/* Handle to the task in which the co-routines run.  Used so the
co-routines can be suspended and resumed. */
static xTaskHandle xCoroutineTask;

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

/**
 * Creates the tasks and co-routines used to toggle the segments of the two
 * seven segment displays, as described at the top of main.c
 */
void vCreateFlashTasksAndCoRoutines( void )
{
signed short sLEDTask;

	/* Create the tasks that flash segments on the first LED. */
	for( sLEDTask = 0; sLEDTask < ledNUM_OF_LED_TASKS; ++sLEDTask )
	{
		/* Spawn the task. */
		xTaskCreate( vLEDFlashTask, ( signed char * ) "LEDt", configMINIMAL_STACK_SIZE, ( void * ) sLEDTask, ( tskIDLE_PRIORITY + 1 ), &( xFlashTaskHandles[ sLEDTask ] ) );
	}

	/* Create the task in which the co-routines run.  The co-routines themselves
	are created within the task. */
	xTaskCreate( vLEDCoRoutineControlTask, ( signed char * ) "LEDc", configMINIMAL_STACK_SIZE, NULL, tskIDLE_PRIORITY, &xCoroutineTask );
}
/*-----------------------------------------------------------*/

void vSuspendFlashTasks( unsigned char ucIndex, short sSuspendTasks )
{
short sLEDTask;

	if( ucIndex == configLEFT_DISPLAY )
	{
		/* Suspend or resume the tasks that are toggling the segments of the
		left side display. */
		for( sLEDTask = 0; sLEDTask < ledNUM_OF_LED_TASKS; ++sLEDTask )
		{
			if( xFlashTaskHandles[ sLEDTask ] != NULL )
			{
				if( sSuspendTasks == pdTRUE )
				{
					vTaskSuspend( xFlashTaskHandles[ sLEDTask ] );
				}
				else
				{
					vTaskResume( xFlashTaskHandles[ sLEDTask ] );
				}
			}
		}
	}
	else
	{
		/* Suspend or resume the task in which the co-routines are running.  The
		co-routines toggle the segments of the right side display. */
		if( sSuspendTasks == pdTRUE )
		{
			vTaskSuspend( xCoroutineTask );
		}
		else
		{
			vTaskResume( xCoroutineTask );
		}
	}
}
/*-----------------------------------------------------------*/

static void vLEDFlashTask( void * pvParameters )
{
portTickType xFlashRate, xLastFlashTime;
unsigned short usLED;

	/* The LED to flash is passed in as the task parameter. */
	usLED = ( unsigned short ) pvParameters;

	/* Calculate the rate at which this task is going to toggle its LED. */
	xFlashRate = ledFLASH_RATE_BASE + ( ledFLASH_RATE_BASE * ( portTickType ) usLED );
	xFlashRate /= portTICK_RATE_MS;

	/* We will turn the LED on and off again in the delay period, so each
	delay is only half the total period. */
	xFlashRate /= ( portTickType ) 2;

	/* We need to initialise xLastFlashTime prior to the first call to 
	vTaskDelayUntil(). */
	xLastFlashTime = xTaskGetTickCount();

	for(;;)
	{
		/* Delay for half the flash period then turn the LED on. */
		vTaskDelayUntil( &xLastFlashTime, xFlashRate );
		vParTestToggleLED( usLED );

		/* Delay for half the flash period then turn the LED off. */
		vTaskDelayUntil( &xLastFlashTime, xFlashRate );
		vParTestToggleLED( usLED );
	}
}
/*-----------------------------------------------------------*/

static void vLEDCoRoutineControlTask( void *pvParameters )
{
unsigned short usCoroutine;

	( void ) pvParameters;

	/* Create the co-routines - one of each segment of the right side display. */
	for( usCoroutine = 0; usCoroutine < ledNUM_OF_LED_CO_ROUTINES; usCoroutine++ )
	{
		xCoRoutineCreate( prvFixedDelayCoRoutine, ledCO_ROUTINE_PRIORITY, usCoroutine );
	}

	/* This task has nothing else to do except scheduler the co-routines it just
	created. */
	for( ;; )
	{
		vCoRoutineSchedule();
	}
}
/*-----------------------------------------------------------*/

static void prvFixedDelayCoRoutine( xCoRoutineHandle xHandle, unsigned short usIndex )
{
/* The usIndex parameter of the co-routine function is used as an index into
the xFlashRates array to obtain the delay period to use. */
static const portTickType xFlashRates[ ledNUM_OF_LED_CO_ROUTINES ] = { 150 / portTICK_RATE_MS,
																300 / portTICK_RATE_MS,
																450 / portTICK_RATE_MS,
																600 / portTICK_RATE_MS,
																750 / portTICK_RATE_MS,
																900 / portTICK_RATE_MS,
																1050 / portTICK_RATE_MS };

	/* Co-routines MUST start with a call to crSTART. */
	crSTART( xHandle );

	for( ;; )
	{
		/* Toggle the LED.  An offset of 8 is used to skip over the segments of
		the left side display which use the low numbers. */
		vParTestToggleLED( usIndex + 8 );

		/* Delay until it is time to toggle the segment that this co-routine is
		controlling again. */
		crDELAY( xHandle, xFlashRates[ usIndex ] );
	}

	/* Co-routines MUST end with a call to crEND. */
	crEND();
}
/*-----------------------------------------------------------*/