/*
    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.

    ***************************************************************************
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    >>!   outside of the FreeRTOS kernel.                                   !<<
    ***************************************************************************

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    link: http://www.freertos.org/a00114.html

    ***************************************************************************
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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 QueueHandle_t 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, "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 );
		}
	}
}
/*-----------------------------------------------------------*/