/*
    FreeRTOS V6.0.5 - Copyright (C) 2010 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.
    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.  See the GNU General Public License for
    more details. You should have received a copy of the GNU General Public
    License and the FreeRTOS license exception along with FreeRTOS; if not it
    can be viewed here: http://www.freertos.org/a00114.html and also obtained
    by writing to Richard Barry, contact details for whom are available on the
    FreeRTOS WEB site.

    1 tab == 4 spaces!

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*/

/*
 * Creates all the demo application tasks, then starts the scheduler.
 *
 * Main.c also creates a task called "Check".  This only executes every three
 * seconds but has the highest priority so is guaranteed to get processor time.
 * Its main function is to check that all the other tasks are still operational.
 * Each task (other than the "flash" tasks) maintains a unique count that is
 * incremented each time the task successfully completes its function.  Should
 * any error occur within such a task the count is permanently halted.  The
 * check task inspects the count of each task to ensure it has changed since
 * the last time the check task executed.  If all the count variables have
 * changed all the tasks are still executing error free, and the check task
 * toggles the on board LED.  Should any task contain an error at any time
 * the LED toggle rate will change from 3 seconds to 500ms.
 *
 * NOTE:  The demo application includes tasks that send and receive characters
 * over the UART. The characters sent by one task are received by another -
 * with an error condition being flagged should any characters be missed or
 * received out of order. A loopback connector is required on the 9way D socket
 * for this mechanism to operation (pins 2 and 3 the socket should be connected
 * together - a paper clip is normally sufficient).
 *
 */

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

/* Scheduler includes. */
#include "FreeRTOS.h"
#include "task.h"

/* Demo application includes. */
#include "partest.h"
#include "flash.h"
#include "integer.h"
#include "PollQ.h"
#include "comtest2.h"
#include "semtest.h"
#include "flop.h"
#include "dynamic.h"
#include "BlockQ.h"
#include "serial.h"
#include "demoGpio.h"
#include "7seg.h"
#include "RegTest.h"

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

/* Constants for the ComTest tasks. */
#define mainCOM_TEST_BAUD_RATE	( ( unsigned long ) 115200 )
#define mainCOM_TEST_LED		( 5 )

/* Priorities for the demo application tasks. */
#define mainLED_TASK_PRIORITY		( tskIDLE_PRIORITY + 3 )
#define mainCOM_TEST_PRIORITY		( tskIDLE_PRIORITY + 2 )
#define mainQUEUE_POLL_PRIORITY		( tskIDLE_PRIORITY + 2 )
#define mainCHECK_TASK_PRIORITY		( tskIDLE_PRIORITY + 4 )
#define mainSEM_TEST_PRIORITY		( tskIDLE_PRIORITY + 1 )
#define mainBLOCK_Q_PRIORITY		( tskIDLE_PRIORITY + 2 )
#define main7SEG_TASK_PRIORITY		( tskIDLE_PRIORITY + 2 )

/* The rate at which the on board LED will toggle when there is/is not an
error. */
#define mainNO_ERROR_FLASH_PERIOD	( ( portTickType ) 3000 / portTICK_RATE_MS	)
#define mainERROR_FLASH_PERIOD		( ( portTickType ) 500 / portTICK_RATE_MS  )
#define mainON_BOARD_LED_BIT		( ( unsigned long ) 7 )

/* The size of the memory blocks allocated by the vMemCheckTask() task. */
#define mainMEM_CHECK_SIZE_1		( ( size_t ) 51 )
#define mainMEM_CHECK_SIZE_2		( ( size_t ) 52 )
#define mainMEM_CHECK_SIZE_3		( ( size_t ) 151 )

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

/*
 * Checks that all the demo application tasks are still executing without error
 * - as described at the top of the file.
 */
static long prvCheckOtherTasksAreStillRunning( void );

/*
 * The task that executes at the highest priority and calls
 * prvCheckOtherTasksAreStillRunning().	 See the description at the top
 * of the file.
 */
static void vErrorChecks( void *pvParameters );

/*
 * Configure the processor for use with the Olimex demo board.	This includes
 * setup for the I/O, system clock, and access timings.
 */
static void prvSetupHardware( void );


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

/*
 * Starts all the other tasks, then starts the scheduler.
 */
int main( void )
{
	/* Setup the hardware for use with the Xilinx evaluation board. */
	prvSetupHardware();

	/* Start the demo/test application tasks. */
	vStartIntegerMathTasks( tskIDLE_PRIORITY );
	vAltStartComTestTasks( mainCOM_TEST_PRIORITY, mainCOM_TEST_BAUD_RATE, mainCOM_TEST_LED );
	vStartLEDFlashTasks( mainLED_TASK_PRIORITY );
	vStartPolledQueueTasks( mainQUEUE_POLL_PRIORITY );
	vStartSemaphoreTasks( mainSEM_TEST_PRIORITY );
	vStartDynamicPriorityTasks();
	vStartBlockingQueueTasks( mainBLOCK_Q_PRIORITY );
	vStart7SegTasks( main7SEG_TASK_PRIORITY );
	vStartRegTestTasks();

	/* Start the check task - which is defined in this file. */
	xTaskCreate( vErrorChecks, ( signed char * ) "Check", configMINIMAL_STACK_SIZE, NULL, mainCHECK_TASK_PRIORITY, NULL );

	/* Now all the tasks have been started - start the scheduler. */
	vTaskStartScheduler();

	/* Should never reach here! */
	for( ;; );
}
/*-----------------------------------------------------------*/

static void vErrorChecks( void *pvParameters )
{
portTickType xDelayPeriod = mainNO_ERROR_FLASH_PERIOD;

	/* Just to stop compiler warnings. */
	( void ) pvParameters;

	/* Cycle for ever, delaying then checking all the other tasks are still
	operating without error.  If an error is detected then the delay period
	is decreased from mainNO_ERROR_FLASH_PERIOD to mainERROR_FLASH_PERIOD so
	the on board LED flash rate will increase. */

	for( ;; )
	{
		/* Delay until it is time to execute again. */
		vTaskDelay( xDelayPeriod );

		/* Check all the standard demo application tasks are executing without
		error.	*/
		if( prvCheckOtherTasksAreStillRunning() != pdPASS )
		{
			/* An error has been detected in one of the tasks - flash faster. */
			xDelayPeriod = mainERROR_FLASH_PERIOD;
		}

		/* The toggle rate of the LED depends on how long this task delays for.
		An error reduces the delay period and so increases the toggle rate. */
		vParTestToggleLED( mainON_BOARD_LED_BIT );
	}
}
/*-----------------------------------------------------------*/

static void prvSetupHardware( void )
{
	/* Initialise LED outputs. */
	vParTestInitialise();
}
/*-----------------------------------------------------------*/

static long prvCheckOtherTasksAreStillRunning( void )
{
long lReturn = pdPASS;

	/* Check all the demo tasks (other than the flash tasks) to ensure
	that they are all still running, and that none of them have detected
	an error. */

	if( xAreIntegerMathsTaskStillRunning() != pdTRUE )
	{
		lReturn = pdFAIL;
	}

	if( xAreComTestTasksStillRunning() != pdTRUE )
	{
		lReturn = pdFAIL;
	}

	if( xArePollingQueuesStillRunning() != pdTRUE )
	{
		lReturn = pdFAIL;
	}

	if( xAreSemaphoreTasksStillRunning() != pdTRUE )
	{
		lReturn = pdFAIL;
	}

	if( xAreDynamicPriorityTasksStillRunning() != pdTRUE )
	{
		lReturn = pdFAIL;
	}

	if( xAreBlockingQueuesStillRunning() != pdTRUE )
	{
		lReturn = pdFAIL;
	}

	if( xAreRegTestTasksStillRunning() != pdTRUE )
	{
		lReturn = pdFAIL;
	}

	return lReturn;
}
/*-----------------------------------------------------------*/

void vApplicationStackOverflowHook( xTaskHandle *pxTask, signed char *pcTaskName )
{
	/* This function will be called if a task overflows its stack.  Inspect
	pxCurrentTCB to find the offending task if the overflow was sever enough
	to corrupt the pcTaskName parameter. */
	vParTestSetLED( 4, 1 );
	for( ;; );
}
/*-----------------------------------------------------------*/

void vApplicationMallocFailedHook( void )
{
	/* This function will be called if a call to pvPortMalloc() fails to return
	the requested memory.  pvPortMalloc() is called internally by the scheduler
	whenever a task, queue or semaphore is created. */
	vParTestSetLED( 4, 1 );
	for( ;; );
}
/*-----------------------------------------------------------*/

/* Provide an exit function to prevent a whole load of standard library functions
being brought into the build. */
void exit( int status )
{
	for( ;; );
}


