/*
    FreeRTOS V7.5.2 - Copyright (C) 2013 Real Time Engineers Ltd.

    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!
*/


#include <stdlib.h>

/* Scheduler include files. */
#include "FreeRTOS.h"
#include "task.h"

/* Demo program include files. */
#include "7seg.h"
#include "demoGpio.h"

#define x7segSTACK_SIZE			configMINIMAL_STACK_SIZE

static void prvRefreshTask( void *pvParameters );
static void prvCountTask( void *pvParameters );

/* Value to output to 7 segment display
led_digits[0] is the right most digit */
static signed char seg7_digits[4];

void vStart7SegTasks( unsigned portBASE_TYPE uxPriority )
{
	xTaskCreate( prvRefreshTask, ( signed char * ) "7SegRefresh", x7segSTACK_SIZE, NULL, uxPriority, ( xTaskHandle *) NULL );
	xTaskCreate( prvCountTask,   ( signed char * ) "7SegCount",	x7segSTACK_SIZE, NULL, uxPriority, ( xTaskHandle *) NULL );
}
/*-----------------------------------------------------------*/

static void prvRefreshTask( void *pvParameters )
{
/* This is table 3.3 from the Spartan-3 Starter Kit board user guide */
const unsigned char bits[ 16 ] =
{
	0x01,
	0x4f,
	0x12,
	0x06,
	0x4c,
	0x24,
	0x20,
	0x0f,
	0x00,
	0x04,
	0x08,
	0x60,
	0x31,
	0x42,
	0x30,
	0x38
};

const unsigned char apsx[4] =
{
	0x06, /* 3 */
	0x24, /* S */
	0x18, /* P */
	0x08  /* A */
};

portTickType xRefreshRate, xLastRefreshTime;

/* Digit to scan */
static int d = 0;

	xRefreshRate = 2;

	/* We need to initialise xLastRefreshTime prior to the first call to
	vTaskDelayUntil(). */
	xLastRefreshTime = xTaskGetTickCount();

	for (;;)
	{
		for( d = 0; d < 4; d++ )
		{
			vTaskDelayUntil ( &xLastRefreshTime, xRefreshRate );

			/* Display digit */
			gpio->out.an  = -1;
			if( ( seg7_digits[ 1 ] == 4 ) || ( seg7_digits[ 1 ] == 5 ) )
			{
				gpio->out.digit = apsx[ d ];
			}
			else
			{
				gpio->out.digit = bits[ seg7_digits[ d ] ];
			}

			gpio->out.dp = 1;
			gpio->out.an  = ~(1 << d);
		}
	}
}
/*-----------------------------------------------------------*/

static void prvCountTask( void *pvParameters )
{
portTickType xCountRate, xLastCountTime;

	/* Approximately 20HZ */
	xCountRate = configTICK_RATE_HZ / 20;

	/* We need to initialise xLastCountTime prior to the first call to
	vTaskDelayUntil(). */
	xLastCountTime = xTaskGetTickCount();

	for (;;)
	{
		vTaskDelayUntil( &xLastCountTime, xCountRate );

		/* Really ugly way to do BCD arithmetic.... */
		seg7_digits[ 0 ] -= 1;
		if( seg7_digits[ 0 ] < 0 )
		{
			seg7_digits[ 0 ] = 9;
			seg7_digits[ 1 ] -= 1;
			if( seg7_digits[ 1 ] < 0 )
			{
				seg7_digits[ 1 ] = 9;
				seg7_digits[ 2 ] -= 1;
				if( seg7_digits[ 2 ] < 0 )
				{
					seg7_digits[ 2 ] = 9;
					seg7_digits[ 3 ] -= 1;
					if( seg7_digits[ 3 ] < 0 )
					{
						seg7_digits[ 3 ] = 9;
					}
				}
			}
		}
	}
}