/*
    FreeRTOS V7.2.0 - Copyright (C) 2012 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 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.  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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*/

/*-----------------------------------------------------------
 * Normally, a demo application would define ParTest (parallel port test) 
 * functions to write to an LED.  In this case, four '*' symbols that are
 * output to the debug printf() port are used to simulate LED outputs.
 *-----------------------------------------------------------*/

/* Standard includes. */
#include <stdio.h>
#include <string.h>

/* Library includes. */
#include "lpc43xx_i2c.h"

/* Kernel includes. */
#include "FreeRTOS.h"
#include "task.h"
#include "queue.h"

/* Standard demo include. */
#include "partest.h"

/* The number of LED outputs. */
#define partstMAX_LEDS 4

/* Commands written to the PCA9502. */
#define partstIO_WRITE_COMMAND	( ( unsigned char ) ( 0x0BU << 3U ) )
#define partstIO_DIR_COMMAND	( ( unsigned char ) ( 0x0AU << 3U ) )
#define partstSLAVE_ADDRESS		( ( unsigned char ) ( 0x9AU >> 1U ) )

/* Just defines the length of the queue used to pass toggle commands to the I2C
gatekeeper task. */
#define partstLED_COMMAND_QUEUE_LENGTH	( 6 )
/*-----------------------------------------------------------*/

/*
 * The LEDs are connected to an I2C port expander.  Therefore, writing to an
 * LED takes longer than might be expected if the LED was connected directly
 * to a GPIO pin.  As several tasks, and a timer, toggle LEDs, it is convenient
 * to use a gatekeeper task to ensure access is both mutually exclusive and
 * serialised.  Tasks other than this gatekeeper task must not access the I2C
 * port directly.
 */
static void prvI2CGateKeeperTask( void *pvParameters );

/* The queue used to communicate toggle commands with the I2C gatekeeper 
task. */
static xQueueHandle xI2CCommandQueue = NULL;
/*-----------------------------------------------------------*/

void vParTestInitialise( void )
{
unsigned char ucBuffer[ 2 ];
I2C_M_SETUP_Type xI2CMessage;

	/* The LEDs are on an I2C IO expander.  Initialise the I2C interface. */
	I2C_Init( LPC_I2C0, 300000 );
	I2C_Cmd( LPC_I2C0, ENABLE );

	/* GPIO0-GPIO2 to output. */
	ucBuffer[ 0 ] = partstIO_DIR_COMMAND;
	ucBuffer[ 1 ] = 0x0f;
	xI2CMessage.sl_addr7bit = partstSLAVE_ADDRESS;
	xI2CMessage.tx_data = ucBuffer ;
	xI2CMessage.tx_length = sizeof( ucBuffer );
	xI2CMessage.rx_data = NULL;
	xI2CMessage.rx_length = 0;
	xI2CMessage.retransmissions_max = 3;
	I2C_MasterTransferData( LPC_I2C0, &xI2CMessage, I2C_TRANSFER_POLLING );

	/* Create the mutex used to guard access to the I2C bus. */
	xI2CCommandQueue = xQueueCreate( partstLED_COMMAND_QUEUE_LENGTH, sizeof( unsigned char ) );
	configASSERT( xI2CCommandQueue );

	/* Create the I2C gatekeeper task itself. */
	xTaskCreate( prvI2CGateKeeperTask, ( signed char * ) "I2C", configMINIMAL_STACK_SIZE, ( void * ) NULL, tskIDLE_PRIORITY, NULL );
}
/*-----------------------------------------------------------*/

void vParTestToggleLED( unsigned long ulLED )
{
unsigned char ucLED = ( unsigned char ) ulLED;

	/* Only the gatekeeper task will actually access the I2C port, so send the
	toggle request to the gatekeeper task.  A block time of zero is used as
	this function is called by a software timer callback. */
	xQueueSend( xI2CCommandQueue, &ucLED, 0UL );
}
/*-----------------------------------------------------------*/

static void prvI2CGateKeeperTask( void *pvParameters )
{
unsigned char ucBuffer[ 2 ], ucLED;
static unsigned char ucLEDState = 0xffU;
static I2C_M_SETUP_Type xI2CMessage; /* Static so it is not on the stack as this is called from task code. */

	/* Just to remove compiler warnings. */
	( void ) pvParameters;

	for( ;; )
	{
		/* Wait for the next command. */
		xQueueReceive( xI2CCommandQueue, &ucLED, portMAX_DELAY );

		/* Only this task is allowed to touch the I2C port, so there is no need
		for additional mutual exclusion. */
		if( ucLED < partstMAX_LEDS )
		{
			/* Which bit is being manipulated? */
			ucLED = 0x01 << ucLED;
	
			/* Is the bit currently set or clear? */
			if( ( ucLEDState & ucLED ) == 0U )
			{
				ucLEDState |= ucLED;
			}
			else
			{
				ucLEDState &= ~ucLED;
			}
	
			ucBuffer[ 0 ] = partstIO_WRITE_COMMAND;
			ucBuffer[ 1 ] = ucLEDState;
	
			xI2CMessage.sl_addr7bit = partstSLAVE_ADDRESS;
			xI2CMessage.tx_data = ucBuffer ;
			xI2CMessage.tx_length = sizeof( ucBuffer );
			xI2CMessage.rx_data = NULL;
			xI2CMessage.rx_length = 0;
			xI2CMessage.retransmissions_max = 3;
			I2C_MasterTransferData( LPC_I2C0, &xI2CMessage, I2C_TRANSFER_POLLING );
		}
	}
}
/*-----------------------------------------------------------*/