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129 lines
6.5 KiB
C
129 lines
6.5 KiB
C
/*
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FreeRTOS V7.4.0 - Copyright (C) 2013 Real Time Engineers Ltd.
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FEATURES AND PORTS ARE ADDED TO FREERTOS ALL THE TIME. PLEASE VISIT
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http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.
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***************************************************************************
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* *
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* FreeRTOS tutorial books are available in pdf and paperback. *
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* Complete, revised, and edited pdf reference manuals are also *
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* available. *
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* *
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* Purchasing FreeRTOS documentation will not only help you, by *
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* ensuring you get running as quickly as possible and with an *
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* in-depth knowledge of how to use FreeRTOS, it will also help *
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* the FreeRTOS project to continue with its mission of providing *
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* professional grade, cross platform, de facto standard solutions *
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* for microcontrollers - completely free of charge! *
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* *
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* >>> See http://www.FreeRTOS.org/Documentation for details. <<< *
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* *
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* Thank you for using FreeRTOS, and 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 modification to the GPL is included to allow you to
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distribute a combined work that includes FreeRTOS without being obliged to
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provide the source code for proprietary components outside of the FreeRTOS
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kernel.
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FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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details. You should have received a copy of the GNU General Public License
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and the FreeRTOS license exception along with FreeRTOS; if not itcan be
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viewed here: http://www.freertos.org/a00114.html and also obtained by
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writing to Real Time Engineers Ltd., contact details for whom are available
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on the FreeRTOS WEB site.
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1 tab == 4 spaces!
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***************************************************************************
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* *
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* Having a problem? Start by reading the FAQ "My application does *
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* not run, what could be wrong?" *
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* *
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* http://www.FreeRTOS.org/FAQHelp.html *
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* *
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***************************************************************************
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http://www.FreeRTOS.org - Documentation, books, training, latest versions,
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license and Real Time Engineers Ltd. contact details.
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http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
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including FreeRTOS+Trace - an indispensable productivity tool, and our new
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fully thread aware and reentrant UDP/IP stack.
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http://www.OpenRTOS.com - Real Time Engineers ltd license FreeRTOS to High
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Integrity Systems, who sell the code with commercial support,
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indemnification and middleware, under the OpenRTOS brand.
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http://www.SafeRTOS.com - High Integrity Systems also provide a safety
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engineered and independently SIL3 certified version for use in safety and
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mission critical applications that require provable dependability.
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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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