/*
    FreeRTOS V7.4.1 - 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 it can 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.
*/

#ifndef I2C_H
#define I2C_H

/* Structure used to capture the I2C message details.  The structure is then
 * queued for processing by the I2C ISR. 
 */
typedef struct AN_I2C_MESSAGE
{
	long lMessageLength;					/*< How many bytes of data to send or received - excluding the buffer address. */
	unsigned char ucSlaveAddress;			/*< The slave address of the WIZnet on the I2C bus. */
	unsigned char ucBufferAddressLowByte;	/*< The address within the WIZnet device to which data should be read from / written to. */
	unsigned char ucBufferAddressHighByte;	/*< As above, high byte. */
	xSemaphoreHandle xMessageCompleteSemaphore;	/*< Contains a reference to a semaphore if the application tasks wants notifying when the message has been transacted. */
	unsigned char *pucBuffer;				/*< Pointer to the buffer from where data will be read for transmission, or into which received data will be placed. */
} xI2CMessage;

/* Constants to use as the ulDirection parameter of i2cMessage(). */
#define i2cWRITE				( ( unsigned long ) 0 )
#define i2cREAD					( ( unsigned long ) 1 )

/**
 * Must be called once before any calls to i2cMessage.
 */
void i2cInit( void );

/**
 * Send or receive a message over the I2C bus.
 *
 * @param pucMessage	 The data to be transmitted or the buffer into which
 *						 received data will be placed. 
 *
 * @param lMessageLength The number of bytes to either transmit or receive.
 *
 * @param ucSlaveAddress The slave address of the WIZNet device on the I2C bus.
 *
 * @param usBufferAddress The address within the WIZNet device to which data is
 *						 either written to or read from.  The WIZnet has it's
 *						 own Rx and Tx buffers.
 *
 * @param ulDirection	 Must be either i2cWRITE or i2cREAD as #defined above.
 *
 * @param xMessageCompleteSemaphore
 *						 Can be used to pass a semaphore reference if the 
 *						 calling task want notification of when the message has
 *						 completed.  Otherwise NULL can be passed.
 * 
 * @param xBlockTime	 The time to wait for a space in the message queue to 
 *						 become available should one not be available 
 *						 immediately.
 */
void i2cMessage( const unsigned char * const pucMessage, long lMessageLength, unsigned char ucSlaveAddress, unsigned short usBufferAddress, unsigned long ulDirection, xSemaphoreHandle xMessageCompleteSemaphore, portTickType xBlockTime );

#endif