blob: 608745ce61a31b52ff89197b09be7e4ed0aec283 [file] [log] [blame]
FreeRTOS V7.4.1 - Copyright (C) 2013 Real Time Engineers Ltd.
* *
* 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 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
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: 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?" *
* *
* *
* *
*************************************************************************** - Documentation, books, training, latest versions,
license and Real Time Engineers Ltd. contact details. - A selection of FreeRTOS ecosystem products,
including FreeRTOS+Trace - an indispensable productivity tool, and our new
fully thread aware and reentrant UDP/IP stack. - Real Time Engineers ltd license FreeRTOS to High
Integrity Systems, who sell the code with commercial support,
indemnification and middleware, under the OpenRTOS brand. - 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 );