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124 lines
6.2 KiB
C
124 lines
6.2 KiB
C
/*
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FreeRTOS V8.2.3 - Copyright (C) 2015 Real Time Engineers Ltd.
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All rights reserved
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VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.
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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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***************************************************************************
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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 !<<
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>>! obliged to provide the source code for proprietary components !<<
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>>! outside of the FreeRTOS kernel. !<<
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***************************************************************************
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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. Full license text is available on the following
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link: http://www.freertos.org/a00114.html
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***************************************************************************
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* *
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* FreeRTOS provides completely free yet professionally developed, *
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* robust, strictly quality controlled, supported, and cross *
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* platform software that is more than just the market leader, it *
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* is the industry's de facto standard. *
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* *
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* Help yourself get started quickly while simultaneously helping *
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* to support the FreeRTOS project by purchasing a FreeRTOS *
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* tutorial book, reference manual, or both: *
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* http://www.FreeRTOS.org/Documentation *
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* *
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***************************************************************************
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http://www.FreeRTOS.org/FAQHelp.html - Having a problem? Start by reading
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the FAQ page "My application does not run, what could be wrong?". Have you
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defined configASSERT()?
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http://www.FreeRTOS.org/support - In return for receiving this top quality
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embedded software for free we request you assist our global community by
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participating in the support forum.
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http://www.FreeRTOS.org/training - Investing in training allows your team to
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be as productive as possible as early as possible. Now you can receive
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FreeRTOS training directly from Richard Barry, CEO of Real Time Engineers
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Ltd, and the world's leading authority on the world's leading RTOS.
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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, a DOS
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compatible FAT file system, and our tiny thread aware UDP/IP stack.
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http://www.FreeRTOS.org/labs - Where new FreeRTOS products go to incubate.
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Come and try FreeRTOS+TCP, our new open source TCP/IP stack for FreeRTOS.
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http://www.OpenRTOS.com - Real Time Engineers ltd. license FreeRTOS to High
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Integrity Systems ltd. to sell under the OpenRTOS brand. Low cost OpenRTOS
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licenses offer ticketed support, indemnification and commercial middleware.
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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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1 tab == 4 spaces!
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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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SemaphoreHandle_t 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, SemaphoreHandle_t xMessageCompleteSemaphore, TickType_t xBlockTime );
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#endif
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