/*
	FreeRTOS V5.4.1 - Copyright (C) 2009 Real Time Engineers Ltd.

	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.  
	Alternative commercial license and support terms are also available upon 
	request.  See the licensing section of http://www.FreeRTOS.org for full 
	license details.

	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 along
	with FreeRTOS; if not, write to the Free Software Foundation, Inc., 59
	Temple Place, Suite 330, Boston, MA  02111-1307  USA.


	***************************************************************************
	*                                                                         *
	* Looking for a quick start?  Then check out the FreeRTOS eBook!          *
	* See http://www.FreeRTOS.org/Documentation for details                   *
	*                                                                         *
	***************************************************************************

	1 tab == 4 spaces!

	Please ensure to read the configuration and relevant port sections of the
	online documentation.

	http://www.FreeRTOS.org - Documentation, latest information, license and
	contact details.

	http://www.SafeRTOS.com - A version that is certified for use in safety
	critical systems.

	http://www.OpenRTOS.com - Commercial support, development, porting,
	licensing and training services.
*/

/* 
	NOTE : Tasks run in system mode and the scheduler runs in Supervisor mode.
	The processor MUST be in supervisor mode when vTaskStartScheduler is 
	called.  The demo applications included in the FreeRTOS.org download switch
	to supervisor mode prior to main being called.  If you are not using one of
	these demo application projects then ensure Supervisor mode is used.
*/


/*
 * Program entry point.
 * 
 * main() is responsible for setting up the microcontroller peripherals, then
 * starting the demo application tasks.  Once the tasks have been created the
 * scheduler is started and main() should never complete.
 *
 * The demo creates the three standard 'flash' tasks to provide some visual
 * feedback that the system and scheduler are still operating correctly.
 *
 * The HTTP server task operates at the highest priority so will always preempt
 * the flash or idle task on TCP/IP events.
 */

/* Standard includes. */
#include <stdlib.h>

/* Scheduler include files. */
#include "FreeRTOS.h"
#include "semphr.h"
#include "task.h"

/* Application includes. */
#include "i2c.h"
#include "HTTP_Serv.h"
#include "flash.h"
#include "partest.h"
#include "dynamic.h"
#include "semtest.h"
#include "PollQ.h"
#include "BlockQ.h"
#include "integer.h"

/*-----------------------------------------------------------*/

/* Constants to setup the PLL. */
#define mainPLL_MUL_4		( ( unsigned portCHAR ) 0x0003 )
#define mainPLL_DIV_1		( ( unsigned portCHAR ) 0x0000 )
#define mainPLL_ENABLE		( ( unsigned portCHAR ) 0x0001 )
#define mainPLL_CONNECT		( ( unsigned portCHAR ) 0x0003 )
#define mainPLL_FEED_BYTE1	( ( unsigned portCHAR ) 0xaa )
#define mainPLL_FEED_BYTE2	( ( unsigned portCHAR ) 0x55 )
#define mainPLL_LOCK		( ( unsigned portLONG ) 0x0400 )

/* Constants to setup the MAM. */
#define mainMAM_TIM_3		( ( unsigned portCHAR ) 0x03 )
#define mainMAM_MODE_FULL	( ( unsigned portCHAR ) 0x02 )

/* Constants to setup the peripheral bus. */
#define mainBUS_CLK_FULL	( ( unsigned portCHAR ) 0x01 )

/* Constants to setup I/O and processor. */
#define mainBUS_CLK_FULL	( ( unsigned portCHAR ) 0x01 )
#define mainLED_TO_OUTPUT	( ( unsigned portLONG ) 0xff0000 )
#define mainJTAG_PORT		( ( unsigned portLONG ) 0x3E0000UL )

/* Priorities for the demo application tasks. */
#define mainLED_TASK_PRIORITY		( tskIDLE_PRIORITY + 1 )
#define mainHTTP_TASK_PRIORITY		( tskIDLE_PRIORITY + 2 )
#define mainBLOCK_Q_PRIORITY		( tskIDLE_PRIORITY + 2 )
#define mainQUEUE_POLL_PRIORITY		( tskIDLE_PRIORITY + 2 )
#define mainERROR_CHECK_PRIORITY	( tskIDLE_PRIORITY + 1 )

/* Flash rates of the on board LED to indicate the health of the system. */
#define mainNO_ERROR_DELAY			( 3000 )
#define mainERROR_DELAY				( 500 )
#define mainON_BOARD_LED_BIT		( ( unsigned portLONG ) 0x80 )

/*-----------------------------------------------------------*/

/*
 * The Olimex demo board has a single built in LED.  This function simply
 * toggles its state. 
 */
void prvToggleOnBoardLED( void );

/*
 * Configure the processor for use with the Olimex demo board.
 */
static void prvSetupHardware( void );

/*
 * Simply check for errors and toggle the onboard LED.
 */
static void prvErrorChecks( void *pvParameters );

/*
 * Return true if the demo tasks are executing without error - otherwise 
 * return false.
 */
static void prvMainCheckOtherTasksAreStillRunning( void );
/*-----------------------------------------------------------*/

/* Flag set by prvMainCheckOtherTasksAreStillExecuting(). */
portLONG lErrorInTask = pdFALSE;

/*
 * Application entry point:
 * Starts all the other tasks, then starts the scheduler. 
 */
int main( void )
{
	/* Setup the hardware for use with the Olimex demo board. */
	prvSetupHardware();

	/* Start the standard flash tasks so the WEB server is not the only thing 
	running. */
	vStartLEDFlashTasks( mainLED_TASK_PRIORITY );
	vStartSemaphoreTasks( tskIDLE_PRIORITY );
	vStartDynamicPriorityTasks();
	vStartPolledQueueTasks( mainQUEUE_POLL_PRIORITY );
	vStartBlockingQueueTasks( mainBLOCK_Q_PRIORITY );
	vStartIntegerMathTasks( tskIDLE_PRIORITY );

	/* Start the WEB server task and the error check task. */
	xTaskCreate( vHTTPServerTask, ( signed portCHAR * ) "HTTP", configMINIMAL_STACK_SIZE, NULL, mainHTTP_TASK_PRIORITY, NULL );
	xTaskCreate( prvErrorChecks, ( signed portCHAR * ) "Check", configMINIMAL_STACK_SIZE, NULL, mainERROR_CHECK_PRIORITY, NULL );
	
	/* Now all the tasks have been started - start the scheduler.

	NOTE : Tasks run in system mode and the scheduler runs in Supervisor mode.
	The processor MUST be in supervisor mode when vTaskStartScheduler is 
	called.  The demo applications included in the FreeRTOS.org download switch
	to supervisor mode prior to main being called.  If you are not using one of
	these demo application projects then ensure Supervisor mode is used. */
	vTaskStartScheduler();

	/* Should never reach here! */
	return 0;
}
/*-----------------------------------------------------------*/

static void prvSetupHardware( void )
{
	#ifdef RUN_FROM_RAM
		/* Remap the interrupt vectors to RAM if we are are running from RAM. */
		SCB_MEMMAP = 2;
	#endif

	/* Set all GPIO to output other than the P0.14 (BSL), and the JTAG pins.  
	The JTAG pins are left as input as I'm not sure what will happen if the 
	Wiggler is connected after powerup - not that it would be a good idea to
	do that anyway. */
	GPIO_IODIR = ~( mainJTAG_PORT );

	/* Setup the PLL to multiply the XTAL input by 4. */
	SCB_PLLCFG = ( mainPLL_MUL_4 | mainPLL_DIV_1 );

	/* Activate the PLL by turning it on then feeding the correct sequence of
	bytes. */
	SCB_PLLCON = mainPLL_ENABLE;
	SCB_PLLFEED = mainPLL_FEED_BYTE1;
	SCB_PLLFEED = mainPLL_FEED_BYTE2;

	/* Wait for the PLL to lock... */
	while( !( SCB_PLLSTAT & mainPLL_LOCK ) );

	/* ...before connecting it using the feed sequence again. */
	SCB_PLLCON = mainPLL_CONNECT;
	SCB_PLLFEED = mainPLL_FEED_BYTE1;
	SCB_PLLFEED = mainPLL_FEED_BYTE2;

	/* Setup and turn on the MAM.  Three cycle access is used due to the fast
	PLL used.  It is possible faster overall performance could be obtained by
	tuning the MAM and PLL settings. */
	MAM_TIM = mainMAM_TIM_3;
	MAM_CR = mainMAM_MODE_FULL;

	/* Setup the peripheral bus to be the same as the PLL output. */
	SCB_VPBDIV = mainBUS_CLK_FULL;

	/* Initialise the i2c peripheral. */
	i2cInit();

	/* Initialise the LED's used by the flash tasks. */
	vParTestInitialise();
}
/*-----------------------------------------------------------*/

static void prvMainCheckOtherTasksAreStillRunning( void )
{
	/* 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. */

	/* This function is called from more than one task. */
	if( xAreIntegerMathsTaskStillRunning() != pdTRUE )
	{
		lErrorInTask = pdTRUE;
	}

	if( xArePollingQueuesStillRunning() != pdTRUE )
	{
		lErrorInTask = pdTRUE;
	}

	if( xAreSemaphoreTasksStillRunning() != pdTRUE )
	{
		lErrorInTask = pdTRUE;
	}

	if( xAreDynamicPriorityTasksStillRunning() != pdTRUE )
	{
		lErrorInTask = pdTRUE;
	}

	if( xAreBlockingQueuesStillRunning() != pdTRUE )
	{
		lErrorInTask = pdTRUE;
	}
}
/*-----------------------------------------------------------*/

void prvToggleOnBoardLED( void )
{
unsigned portLONG ulState;

	ulState = GPIO0_IOPIN;
	if( ulState & mainON_BOARD_LED_BIT )
	{
		GPIO_IOCLR = mainON_BOARD_LED_BIT;
	}
	else
	{
		GPIO_IOSET = mainON_BOARD_LED_BIT;
	}	
}
/*-----------------------------------------------------------*/

static void prvErrorChecks( void *pvParameters )
{
portTickType xDelay = mainNO_ERROR_DELAY;

	/* The parameters are not used. */
	( void ) pvParameters;

	for( ;; )
	{
		/* How long we delay depends on whether an error has been detected
		or not.  Therefore the flash rate of the on board LED indicates 
		whether or not an error has occurred. */
		vTaskDelay( xDelay );

		/* Update the lErrorInTask flag. */
		prvMainCheckOtherTasksAreStillRunning();

		if( lErrorInTask )
		{
			/* An error has been found so reduce the delay period and in so
			doing speed up the flash rate of the on board LED. */
			xDelay = mainERROR_DELAY;
		}

		prvToggleOnBoardLED();
	}
}