
/*
    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!
*/


/*
 *
 * vMain() is effectively the demo application entry point.  It is called by
 * the main() function generated by the Processor Expert application.  
 *
 * vMain() creates all the demo application tasks, then starts the scheduler.
 * The WEB	documentation provides more details of the demo application tasks.
 *
 * 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 onboard LED.  Should any task contain an error at any time 
 * the LED toggle rate will change from 3 seconds to 500ms.
 *
 * This file also includes the functionality implemented within the 
 * standard demo application file integer.c.  This is done to demonstrate the
 * use of an idle hook.  See the documentation within integer.c for the 
 * rationale of the integer task functionality.
 * */

/* Kernel includes. */
#include "FreeRTOS.h"
#include "task.h"
#include "queue.h"

/* Demo application includes. */
#include "flash.h"
#include "PollQ.h"
#include "dynamic.h"
#include "partest.h"
#include "comtest2.h"
#include "BlockQ.h"
#include "integer.h"
#include "death.h"


/*-----------------------------------------------------------
	Definitions.
-----------------------------------------------------------*/

/* Priorities assigned to demo application tasks. */
#define mainFLASH_PRIORITY			( tskIDLE_PRIORITY + 2 )
#define mainCHECK_TASK_PRIORITY		( tskIDLE_PRIORITY + 3 )
#define mainQUEUE_POLL_PRIORITY		( tskIDLE_PRIORITY + 1 )
#define mainCOM_TEST_PRIORITY		( tskIDLE_PRIORITY + 2 )
#define mainBLOCK_Q_PRIORITY		( tskIDLE_PRIORITY + 2 )
#define mainDEATH_PRIORITY			( tskIDLE_PRIORITY + 1 )

/* LED that is toggled by the check task.  The check task periodically checks
that all the other tasks are operating without error.  If no errors are found
the LED is toggled with mainCHECK_PERIOD frequency.  If an error is found 
then the toggle rate increases to mainERROR_CHECK_PERIOD. */
#define mainCHECK_TASK_LED			( 7 )
#define mainCHECK_PERIOD			( ( TickType_t ) 3000 / portTICK_PERIOD_MS  )
#define mainERROR_CHECK_PERIOD		( ( TickType_t ) 500 / portTICK_PERIOD_MS )

/* The constants used in the idle task calculation. */
#define intgCONST1				( ( long ) 123 )
#define intgCONST2				( ( long ) 234567 )
#define intgCONST3				( ( long ) -3 )
#define intgCONST4				( ( long ) 7 )
#define intgEXPECTED_ANSWER		( ( ( intgCONST1 + intgCONST2 ) * intgCONST3 ) / intgCONST4 )


/* Baud rate used by the serial port tasks (ComTest tasks).
IMPORTANT:  The function COM0_SetBaudRateValue() which is generated by the
Processor Expert is used to set the baud rate.  As configured in the FreeRTOS
download this value must be one of the following:

0 to configure for 38400 baud.
1 to configure for 19200 baud.
2 to configure for 9600 baud.
3 to configure for 4800 baud. */
#define mainCOM_TEST_BAUD_RATE			( ( unsigned long ) 2 )

/* LED used by the serial port tasks.  This is toggled on each character Tx,
and mainCOM_TEST_LED + 1 is toggles on each character Rx. */
#define mainCOM_TEST_LED				( 3 )

/*-----------------------------------------------------------
	Local functions prototypes.
-----------------------------------------------------------*/

/*
 * The 'Check' task function.  See the explanation at the top of the file.
 */
static void vErrorChecks( void* pvParameters );

/*
 * The idle task hook - in which the integer task is implemented.  See the
 * explanation at the top of the file.
 */
void vApplicationIdleHook( void );

/*
 * Checks the unique counts of other tasks to ensure they are still operational.
 */
static long prvCheckOtherTasksAreStillRunning( void );



/*-----------------------------------------------------------
	Local variables.
-----------------------------------------------------------*/

/* A few tasks are defined within this file.  This flag is used to indicate
their status.  If an error is detected in one of the locally defined tasks then
this flag is set to pdTRUE. */
portBASE_TYPE xLocalError = pdFALSE;


/*-----------------------------------------------------------*/

/* 
 * This is called from the main() function generated by the Processor Expert.
 */
void vMain( void )
{
	/* Start some of the standard demo tasks. */
	vStartLEDFlashTasks( mainFLASH_PRIORITY );
	vStartPolledQueueTasks( mainQUEUE_POLL_PRIORITY );
	vStartDynamicPriorityTasks();
	vAltStartComTestTasks( mainCOM_TEST_PRIORITY, mainCOM_TEST_BAUD_RATE, mainCOM_TEST_LED );
	vStartBlockingQueueTasks( mainBLOCK_Q_PRIORITY );
	vStartIntegerMathTasks( tskIDLE_PRIORITY );
		
	/* Start the locally defined tasks.  There is also a task implemented as
	the idle hook. */
	xTaskCreate( vErrorChecks, "Check", configMINIMAL_STACK_SIZE, NULL, mainCHECK_TASK_PRIORITY, NULL );
	
	/* Must be the last demo created. */
	vCreateSuicidalTasks( mainDEATH_PRIORITY );

	/* All the tasks have been created - start the scheduler. */
	vTaskStartScheduler();
	
	/* Should not reach here! */
	for( ;; );
}
/*-----------------------------------------------------------*/

static void vErrorChecks( void *pvParameters )
{
TickType_t xDelayPeriod = mainCHECK_PERIOD;
TickType_t xLastWakeTime;

	/* Initialise xLastWakeTime to ensure the first call to vTaskDelayUntil()
	functions correctly. */
	xLastWakeTime = xTaskGetTickCount();

	for( ;; )
	{
		/* Delay until it is time to execute again.  The delay period is 
		shorter following an error. */
		vTaskDelayUntil( &xLastWakeTime, xDelayPeriod );

		/* Check all the demo application tasks are executing without 
		error. If an error is found the delay period is shortened - this
		has the effect of increasing the flash rate of the 'check' task
		LED. */
		if( prvCheckOtherTasksAreStillRunning() == pdFAIL )
		{
			/* An error has been detected in one of the tasks - flash faster. */
			xDelayPeriod = mainERROR_CHECK_PERIOD;
		}

		/* Toggle the LED each cycle round. */
		vParTestToggleLED( mainCHECK_TASK_LED );
	}
}
/*-----------------------------------------------------------*/

static long prvCheckOtherTasksAreStillRunning( void )
{
portBASE_TYPE xAllTasksPassed = pdPASS;

	if( xArePollingQueuesStillRunning() != pdTRUE )
	{
		xAllTasksPassed = pdFAIL;
	}

	if( xAreDynamicPriorityTasksStillRunning() != pdTRUE )
	{
		xAllTasksPassed = pdFAIL;
	}

	if( xAreComTestTasksStillRunning() != pdTRUE )
	{
		xAllTasksPassed = pdFALSE;
	}

	if( xAreIntegerMathsTaskStillRunning() != pdTRUE )
	{
		xAllTasksPassed = pdFALSE;
	}
	
	if( xAreBlockingQueuesStillRunning() != pdTRUE )
	{
		xAllTasksPassed = pdFALSE;
	}	

    if( xIsCreateTaskStillRunning() != pdTRUE )
    {
    	xAllTasksPassed = pdFALSE;
    }

	/* Also check the status flag for the tasks defined within this function. */
	if( xLocalError != pdFALSE )
	{
		xAllTasksPassed = pdFAIL;
	}
	
	return xAllTasksPassed;
}
/*-----------------------------------------------------------*/

void vApplicationIdleHook( void )
{
/* This variable is effectively set to a constant so it is made volatile to
ensure the compiler does not just get rid of it. */
volatile long lValue;

	/* Keep performing a calculation and checking the result against a constant. */

	/* Perform the calculation.  This will store partial value in
	registers, resulting in a good test of the context switch mechanism. */
	lValue = intgCONST1;
	lValue += intgCONST2;
	lValue *= intgCONST3;
	lValue /= intgCONST4;

	/* Did we perform the calculation correctly with no corruption? */
	if( lValue != intgEXPECTED_ANSWER )
	{
		/* Error! */
		portENTER_CRITICAL();
			xLocalError = pdTRUE;
		portEXIT_CRITICAL();
	}

	/* Yield in case cooperative scheduling is being used. */
	#if configUSE_PREEMPTION == 0
	{
		taskYIELD();
	}
	#endif		
}
/*-----------------------------------------------------------*/