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[/] [openrisc/] [trunk/] [rtos/] [freertos-6.1.1/] [Demo/] [WizNET_DEMO_GCC_ARM7/] [i2c.h] - Blame information for rev 590

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1 585 jeremybenn
/*
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    FreeRTOS V6.1.1 - Copyright (C) 2011 Real Time Engineers Ltd.
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    ***************************************************************************
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    *                                                                         *
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    * If you are:                                                             *
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    *                                                                         *
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    *    + New to FreeRTOS,                                                   *
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    *    + Wanting to learn FreeRTOS or multitasking in general quickly       *
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    *    + Looking for basic training,                                        *
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    *    + Wanting to improve your FreeRTOS skills and productivity           *
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    *                                                                         *
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    * then take a look at the FreeRTOS books - available as PDF or paperback  *
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    *                                                                         *
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    *        "Using the FreeRTOS Real Time Kernel - a Practical Guide"        *
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    *                  http://www.FreeRTOS.org/Documentation                  *
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    *                                                                         *
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    * A pdf reference manual is also available.  Both are usually delivered   *
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    * to your inbox within 20 minutes to two hours when purchased between 8am *
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    * and 8pm GMT (although please allow up to 24 hours in case of            *
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    * exceptional circumstances).  Thank you for your support!                *
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    *                                                                         *
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    ***************************************************************************
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    This file is part of the FreeRTOS distribution.
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    FreeRTOS is free software; you can redistribute it and/or modify it under
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    the terms of the GNU General Public License (version 2) as published by the
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    Free Software Foundation AND MODIFIED BY the FreeRTOS exception.
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    ***NOTE*** The exception to the GPL is included to allow you to distribute
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    a combined work that includes FreeRTOS without being obliged to provide the
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    source code for proprietary components outside of the FreeRTOS kernel.
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    FreeRTOS is distributed in the hope that it will be useful, but WITHOUT
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    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
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    more details. You should have received a copy of the GNU General Public
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    License and the FreeRTOS license exception along with FreeRTOS; if not it
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    can be viewed here: http://www.freertos.org/a00114.html and also obtained
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    by writing to Richard Barry, contact details for whom are available on the
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    FreeRTOS WEB site.
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    1 tab == 4 spaces!
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    http://www.FreeRTOS.org - Documentation, latest information, license and
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    contact details.
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    http://www.SafeRTOS.com - A version that is certified for use in safety
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    critical systems.
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    http://www.OpenRTOS.com - Commercial support, development, porting,
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    licensing and training services.
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*/
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#ifndef I2C_H
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#define I2C_H
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/* Structure used to capture the I2C message details.  The structure is then
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 * queued for processing by the I2C ISR.
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 */
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typedef struct AN_I2C_MESSAGE
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{
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        long lMessageLength;                                    /*< How many bytes of data to send or received - excluding the buffer address. */
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        unsigned char ucSlaveAddress;                   /*< The slave address of the WIZnet on the I2C bus. */
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        unsigned char ucBufferAddressLowByte;   /*< The address within the WIZnet device to which data should be read from / written to. */
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        unsigned char ucBufferAddressHighByte;  /*< As above, high byte. */
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        xSemaphoreHandle xMessageCompleteSemaphore;     /*< Contains a reference to a semaphore if the application tasks wants notifying when the message has been transacted. */
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        unsigned char *pucBuffer;                               /*< Pointer to the buffer from where data will be read for transmission, or into which received data will be placed. */
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} xI2CMessage;
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/* Constants to use as the ulDirection parameter of i2cMessage(). */
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#define i2cWRITE                                ( ( unsigned long ) 0 )
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#define i2cREAD                                 ( ( unsigned long ) 1 )
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/**
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 * Must be called once before any calls to i2cMessage.
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 */
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void i2cInit( void );
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/**
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 * Send or receive a message over the I2C bus.
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 *
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 * @param pucMessage     The data to be transmitted or the buffer into which
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 *                                               received data will be placed.
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 *
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 * @param lMessageLength The number of bytes to either transmit or receive.
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 *
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 * @param ucSlaveAddress The slave address of the WIZNet device on the I2C bus.
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 *
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 * @param usBufferAddress The address within the WIZNet device to which data is
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 *                                               either written to or read from.  The WIZnet has it's
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 *                                               own Rx and Tx buffers.
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 *
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 * @param ulDirection    Must be either i2cWRITE or i2cREAD as #defined above.
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 *
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 * @param xMessageCompleteSemaphore
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 *                                               Can be used to pass a semaphore reference if the
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 *                                               calling task want notification of when the message has
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 *                                               completed.  Otherwise NULL can be passed.
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 *
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 * @param xBlockTime     The time to wait for a space in the message queue to
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 *                                               become available should one not be available
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 *                                               immediately.
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 */
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void i2cMessage( const unsigned char * const pucMessage, long lMessageLength, unsigned char ucSlaveAddress, unsigned short usBufferAddress, unsigned long ulDirection, xSemaphoreHandle xMessageCompleteSemaphore, portTickType xBlockTime );
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#endif
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