/*
    FreeRTOS V8.1.0 - Copyright (C) 2014 Real Time Engineers Ltd.
    All rights reserved

    VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.

    ***************************************************************************
     *                                                                       *
     *    FreeRTOS provides completely free yet professionally developed,    *
     *    robust, strictly quality controlled, supported, and cross          *
     *    platform software that has become a de facto standard.             *
     *                                                                       *
     *    Help yourself get started quickly and support the FreeRTOS         *
     *    project by purchasing a FreeRTOS tutorial book, reference          *
     *    manual, or both from: http://www.FreeRTOS.org/Documentation        *
     *                                                                       *
     *    Thank you!                                                         *
     *                                                                       *
    ***************************************************************************

    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 from the following
    link: http://www.freertos.org/a00114.html

    1 tab == 4 spaces!

    ***************************************************************************
     *                                                                       *
     *    Having a problem?  Start by reading the FAQ "My application does   *
     *    not run, what could be wrong?"                                     *
     *                                                                       *
     *    http://www.FreeRTOS.org/FAQHelp.html                               *
     *                                                                       *
    ***************************************************************************

    http://www.FreeRTOS.org - Documentation, books, training, latest versions,
    license and Real Time Engineers Ltd. contact details.

    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.OpenRTOS.com - Real Time Engineers ltd license FreeRTOS to High
    Integrity Systems to sell under the OpenRTOS brand.  Low cost OpenRTOS
    licenses offer ticketed support, indemnification and 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 project provides three demo applications.  A simple blinky style
 * project, a more comprehensive test and demo application, and an lwIP example.
 * The mainSELECTED_APPLICATION setting (defined in this file) is used to
 * select between the three.  The simply blinky demo is implemented and
 * described in main_blinky.c.  The more comprehensive test and demo application
 * is implemented and described in main_full.c.  The lwIP example is implemented
 * and described in main_lwIP.c.
 *
 * This file implements the code that is not demo specific, including the
 * hardware setup and FreeRTOS hook functions.
 *
 * !!! IMPORTANT NOTE !!!
 * The GCC libraries that ship with the Xilinx SDK make use of the floating
 * point registers.  To avoid this causing corruption it is necessary to avoid
 * their use.  For this reason main.c contains very basic C implementations of
 * the standard C library functions memset(), memcpy() and memcmp(), which are
 * are used by FreeRTOS itself.  Defining these functions in the project 
 * prevents the linker pulling them in from the library.  Any other standard C
 * library functions that are used by the application must likewise be defined
 * in C.
 *
 * ENSURE TO READ THE DOCUMENTATION PAGE FOR THIS PORT AND DEMO APPLICATION ON
 * THE http://www.FreeRTOS.org WEB SITE FOR FULL INFORMATION ON USING THIS DEMO
 * APPLICATION, AND ITS ASSOCIATE FreeRTOS ARCHITECTURE PORT!
 *
 */

/* Standard includes. */
#include <stdio.h>
#include <limits.h>

/* Scheduler include files. */
#include "FreeRTOS.h"
#include "task.h"
#include "semphr.h"

/* Standard demo includes. */
#include "partest.h"
#include "TimerDemo.h"
#include "QueueOverwrite.h"
#include "EventGroupsDemo.h"

/* Xilinx includes. */
#include "platform.h"
#include "xparameters.h"
#include "xscutimer.h"
#include "xscugic.h"
#include "xil_exception.h"

/* mainSELECTED_APPLICATION is used to select between three demo applications,
 * as described at the top of this file.
 *
 * When mainSELECTED_APPLICATION is set to 0 the simple blinky example will
 * be run.
 *
 * When mainSELECTED_APPLICATION is set to 1 the comprehensive test and demo
 * application will be run.
 *
 * When mainSELECTED_APPLICATION is set to 2 the lwIP example will be run.
 */
#define mainSELECTED_APPLICATION	0

/*-----------------------------------------------------------*/

/*
 * Configure the hardware as necessary to run this demo.
 */
static void prvSetupHardware( void );

/*
 * See the comments at the top of this file and above the
 * mainSELECTED_APPLICATION definition.
 */
#if ( mainSELECTED_APPLICATION == 0 )
	extern void main_blinky( void );
#elif ( mainSELECTED_APPLICATION == 1 )
	extern void main_full( void );
#elif ( mainSELECTED_APPLICATION == 2 )
	extern void main_lwIP( void );
#else
	#error Invalid mainSELECTED_APPLICATION setting.  See the comments at the top of this file and above the mainSELECTED_APPLICATION definition.
#endif /* #if mainCREATE_SIMPLE_BLINKY_DEMO_ONLY == 1 */

/*
 * The Xilinx projects use a BSP that do not allow the start up code to be
 * altered easily.  Therefore the vector table used by FreeRTOS is defined in
 * FreeRTOS_asm_vectors.S, which is part of this project.  Switch to use the
 * FreeRTOS vector table.
 */
extern void vPortInstallFreeRTOSVectorTable( void );

/* Prototypes for the standard FreeRTOS callback/hook functions implemented
within this file. */
void vApplicationMallocFailedHook( void );
void vApplicationIdleHook( void );
void vApplicationStackOverflowHook( TaskHandle_t pxTask, char *pcTaskName );
void vApplicationTickHook( void );

/* The private watchdog is used as the timer that generates run time
stats.  This frequency means it will overflow quite quickly. */
XScuWdt xWatchDogInstance;

/*-----------------------------------------------------------*/

/* The interrupt controller is initialised in this file, and made available to
other modules. */
XScuGic xInterruptController;

/*-----------------------------------------------------------*/

int main( void )
{
	/* Configure the hardware ready to run the demo. */
	prvSetupHardware();

	/* The mainSELECTED_APPLICATION setting is described at the top
	of this file. */
	#if( mainSELECTED_APPLICATION == 0 )
	{
		main_blinky();
	}
	#elif( mainSELECTED_APPLICATION == 1 )
	{
		main_full();
	}
	#else
	{
		main_lwIP();
	}
	#endif

	/* Don't expect to reach here. */
	return 0;
}
/*-----------------------------------------------------------*/

static void prvSetupHardware( void )
{
BaseType_t xStatus;
XScuGic_Config *pxGICConfig;

	/* Ensure no interrupts execute while the scheduler is in an inconsistent
	state.  Interrupts are automatically enabled when the scheduler is
	started. */
	portDISABLE_INTERRUPTS();

	/* Obtain the configuration of the GIC. */
	pxGICConfig = XScuGic_LookupConfig( XPAR_SCUGIC_SINGLE_DEVICE_ID );

	/* Sanity check the FreeRTOSConfig.h settings are correct for the
	hardware. */
	configASSERT( pxGICConfig );
	configASSERT( pxGICConfig->CpuBaseAddress == ( configINTERRUPT_CONTROLLER_BASE_ADDRESS + configINTERRUPT_CONTROLLER_CPU_INTERFACE_OFFSET ) );
	configASSERT( pxGICConfig->DistBaseAddress == configINTERRUPT_CONTROLLER_BASE_ADDRESS );

	/* Install a default handler for each GIC interrupt. */
	xStatus = XScuGic_CfgInitialize( &xInterruptController, pxGICConfig, pxGICConfig->CpuBaseAddress );
	configASSERT( xStatus == XST_SUCCESS );
	( void ) xStatus; /* Remove compiler warning if configASSERT() is not defined. */

	/* Initialise the LED port. */
	vParTestInitialise();

	/* The Xilinx projects use a BSP that do not allow the start up code to be
	altered easily.  Therefore the vector table used by FreeRTOS is defined in
	FreeRTOS_asm_vectors.S, which is part of this project.  Switch to use the
	FreeRTOS vector table. */
	vPortInstallFreeRTOSVectorTable();
}
/*-----------------------------------------------------------*/

void vApplicationMallocFailedHook( void )
{
	/* Called if a call to pvPortMalloc() fails because there is insufficient
	free memory available in the FreeRTOS heap.  pvPortMalloc() is called
	internally by FreeRTOS API functions that create tasks, queues, software
	timers, and semaphores.  The size of the FreeRTOS heap is set by the
	configTOTAL_HEAP_SIZE configuration constant in FreeRTOSConfig.h. */
	taskDISABLE_INTERRUPTS();
	for( ;; );
}
/*-----------------------------------------------------------*/

void vApplicationStackOverflowHook( TaskHandle_t pxTask, char *pcTaskName )
{
	( void ) pcTaskName;
	( void ) pxTask;

	/* Run time stack overflow checking is performed if
	configCHECK_FOR_STACK_OVERFLOW is defined to 1 or 2.  This hook
	function is called if a stack overflow is detected. */
	taskDISABLE_INTERRUPTS();
	for( ;; );
}
/*-----------------------------------------------------------*/

void vApplicationIdleHook( void )
{
volatile size_t xFreeHeapSpace;

	/* This is just a trivial example of an idle hook.  It is called on each
	cycle of the idle task.  It must *NOT* attempt to block.  In this case the
	idle task just queries the amount of FreeRTOS heap that remains.  See the
	memory management section on the http://www.FreeRTOS.org web site for memory
	management options.  If there is a lot of heap memory free then the
	configTOTAL_HEAP_SIZE value in FreeRTOSConfig.h can be reduced to free up
	RAM. */
	xFreeHeapSpace = xPortGetFreeHeapSize();

	/* Remove compiler warning about xFreeHeapSpace being set but never used. */
	( void ) xFreeHeapSpace;
}
/*-----------------------------------------------------------*/

void vAssertCalled( const char * pcFile, unsigned long ulLine )
{
volatile unsigned long ul = 0;

	( void ) pcFile;
	( void ) ulLine;

	taskENTER_CRITICAL();
	{
		/* Set ul to a non-zero value using the debugger to step out of this
		function. */
		while( ul == 0 )
		{
			portNOP();
		}
	}
	taskEXIT_CRITICAL();
}
/*-----------------------------------------------------------*/

void vApplicationTickHook( void )
{
	#if( mainSELECTED_APPLICATION == 1 )
	{
		/* The full demo includes a software timer demo/test that requires
		prodding periodically from the tick interrupt. */
		vTimerPeriodicISRTests();

		/* Call the periodic queue overwrite from ISR demo. */
		vQueueOverwritePeriodicISRDemo();

		/* Call the periodic event group from ISR demo. */
		vPeriodicEventGroupsProcessing();
	}
	#endif
}
/*-----------------------------------------------------------*/

void *memcpy( void *pvDest, const void *pvSource, size_t ulBytes )
{
unsigned char *pcDest = ( unsigned char * ) pvDest, *pcSource = ( unsigned char * ) pvSource;
size_t x;

	for( x = 0; x < ulBytes; x++ )
	{
		*pcDest = *pcSource;
		pcDest++;
		pcSource++;
	}

	return pvDest;
}
/*-----------------------------------------------------------*/

void *memset( void *pvDest, int iValue, size_t ulBytes )
{
unsigned char *pcDest = ( unsigned char * ) pvDest;
size_t x;

	for( x = 0; x < ulBytes; x++ )
	{
		*pcDest = ( unsigned char ) iValue;
		pcDest++;
	}

	return pvDest;
}
/*-----------------------------------------------------------*/

int memcmp( const void *pvMem1, const void *pvMem2, size_t ulBytes )
{
const unsigned char *pucMem1 = pvMem1, *pucMem2 = pvMem2;
size_t x;

    for( x = 0; x < ulBytes; x++ )
    {
        if( pucMem1[ x ] != pucMem2[ x ] )
        {
            break;
        }
    }

    return ulBytes - x;
}
/*-----------------------------------------------------------*/

void vInitialiseTimerForRunTimeStats( void )
{
XScuWdt_Config *pxWatchDogInstance;
uint32_t ulValue;
const uint32_t ulMaxDivisor = 0xff, ulDivisorShift = 0x08;

	 pxWatchDogInstance = XScuWdt_LookupConfig( XPAR_SCUWDT_0_DEVICE_ID );
	 XScuWdt_CfgInitialize( &xWatchDogInstance, pxWatchDogInstance, pxWatchDogInstance->BaseAddr );

	 ulValue = XScuWdt_GetControlReg( &xWatchDogInstance );
	 ulValue |= ulMaxDivisor << ulDivisorShift;
	 XScuWdt_SetControlReg( &xWatchDogInstance, ulValue );

	 XScuWdt_LoadWdt( &xWatchDogInstance, UINT_MAX );
	 XScuWdt_SetTimerMode( &xWatchDogInstance );
	 XScuWdt_Start( &xWatchDogInstance );
}