File content as of revision 8:c0ae66611a12:

/*!
LT_I2C: Routines to communicate with ATmega328P's hardware I2C port.

REVISION HISTORY
$Revision: 3659 $
$Date: 2015-07-01 10:19:20 -0700 (Wed, 01 Jul 2015) $

Copyright (c) 2013, Linear Technology Corp.(LTC)
All rights reserved.

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modification, are permitted provided that the following conditions are met:

1. Redistributions of source code must retain the above copyright notice, this
   list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice,
   this list of conditions and the following disclaimer in the documentation
   and/or other materials provided with the distribution.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
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*/

/*! @file
    @ingroup LT_I2C
    Library Header File for LT_I2C: Routines to communicate with ATmega328P's hardware I2C port.
*/

#ifndef LT_I2C_H
#define LT_I2C_H

#include <stdint.h>
//#include <Wire.h>

//! @name HARDWARE I2C PRESCALER VALUES
//! @{
#define HARDWARE_I2C_PRESCALER_1  0
#define HARDWARE_I2C_PRESCALER_4  1
#define HARDWARE_I2C_PRESCALER_16 2
#define HARDWARE_I2C_PRESCALER_64 3
//! @}

//! @name I2C READ and WRITE BITS
//! @{
//! Eighth bit (LSB) of I2C address indicates a "read" or "write".
//! (The first seven bits are the 7-bit I2C address.)
#define I2C_READ_BIT    0x01
#define I2C_WRITE_BIT   0x00
//! @}

//! @name STATUS BITS
//! @{
#define STATUS_START               0x08
#define STATUS_REPEATED_START      0x10
#define STATUS_ADDRESS_WRITE_ACK   0x18
#define STATUS_ADDRESS_WRITE_NACK  0x20
#define STATUS_WRITE_ACK           0x28
#define STATUS_WRITE_NACK          0x30
#define STATUS_ARBITRATION_LOST    0x38
#define STATUS_ADDRESS_READ_ACK    0x40
#define STATUS_ADDRESS_READ_NACK   0x48
#define STATUS_READ_ACK            0x50
#define STATUS_READ_NACK           0x58
//! @}

//! @name TIMEOUT AND DELAY IN US
//! @{
#define HW_I2C_DELAY  1
#define HW_I2C_TIMEOUT  20000
//! @}

//! @name ACK OR NACK PARAMETER PASSED TO I2C_READ
//! @{
#define WITH_ACK  0  //!<  Use with i2c_read(WITH_ACK) to read with an acknowledge
#define WITH_NACK 1  //!<  Use with i2c_read(WITH_NACK) to read without an acknowledge.  Normally used after the last byte of a multi-byte read.
//! @}

//! @name OPTIONAL I2C Address MACRO
//! @{
#define I2C_8ADDR(address) (address >> 1)  //!< Use to convert an 8-bit I2C address to 7 bits.
//! @}

#include "mbed.h"

class LT_I2C {
private:
    I2C *i2c;
    PinName sda;
    PinName scl;

public:
    LT_I2C();
    LT_I2C(PinName sda_, PinName scl_);
    
    //! Read a byte of data at register specified by "command", store in "value"
    //! @return 0 on success, 1 on failure
    int8_t i2c_read_byte_data(uint8_t address,     //!< 7-bit I2C address
                              uint8_t command,   //!< Command byte
                              uint8_t *value     //!< Byte to be read
                             );
    
    //! Write a byte of data to register specified by "command"
    //! @return 0 on success, 1 on failure
    int8_t i2c_write_byte_data(uint8_t address,    //!< 7-bit I2C address
                               uint8_t command,  //!< Command byte
                               uint8_t value     //!< Byte to be written
                              );
    
    //! Read a 16-bit word of data from register specified by "command"
    //! @return 0 on success, 1 on failure
    int8_t i2c_read_word_data(uint8_t address,     //!< 7-bit I2C address
                              uint8_t command,   //!< Command byte
                              uint16_t *value    //!< Word to be read
                             );
    
    //! Write a 16-bit word of data to register specified by "command"
    //! @return 0 on success, 1 on failure
    int8_t i2c_write_word_data(uint8_t address,    //!< 7-bit I2C address
                               uint8_t command,  //!< Command byte
                               uint16_t value    //!< Word to be written
                              );
};
#endif  // LT_I2C_H