/*
    FreeRTOS V7.4.0 - Copyright (C) 2013 Real Time Engineers Ltd.

    FEATURES AND PORTS ARE ADDED TO FREERTOS ALL THE TIME.  PLEASE VISIT
    http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.

    ***************************************************************************
     *                                                                       *
     *    FreeRTOS tutorial books are available in pdf and paperback.        *
     *    Complete, revised, and edited pdf reference manuals are also       *
     *    available.                                                         *
     *                                                                       *
     *    Purchasing FreeRTOS documentation will not only help you, by       *
     *    ensuring you get running as quickly as possible and with an        *
     *    in-depth knowledge of how to use FreeRTOS, it will also help       *
     *    the FreeRTOS project to continue with its mission of providing     *
     *    professional grade, cross platform, de facto standard solutions    *
     *    for microcontrollers - completely free of charge!                  *
     *                                                                       *
     *    >>> See http://www.FreeRTOS.org/Documentation for details. <<<     *
     *                                                                       *
     *    Thank you for using FreeRTOS, and thank you for your support!      *
     *                                                                       *
    ***************************************************************************


    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 itcan be
    viewed here: http://www.freertos.org/a00114.html and also obtained by
    writing to Real Time Engineers Ltd., contact details for whom are available
    on the FreeRTOS WEB site.

    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, and our new
    fully thread aware and reentrant UDP/IP stack.

    http://www.OpenRTOS.com - Real Time Engineers ltd license FreeRTOS to High 
    Integrity Systems, who sell the code with commercial support, 
    indemnification and middleware, under the OpenRTOS brand.
    
    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.
*/

/*-----------------------------------------------------------
 * 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 );
		}
	}
}
/*-----------------------------------------------------------*/

