i2ceeprom.c

Go to the documentation of this file.

/*! \file i2ceeprom.c \brief Interface for standard I2C EEPROM memories. */
//*****************************************************************************
//
// File Name    : 'i2ceeprom.c'
// Title        : Interface for standard I2C EEPROM memories
// Author       : Pascal Stang - Copyright (C) 2003
// Created      : 2003.04.23
// Revised      : 2003.04.23
// Version      : 0.1
// Target MCU   : Atmel AVR series
// Editor Tabs  : 4
//
// This code is distributed under the GNU Public License
//      which can be found at http://www.gnu.org/licenses/gpl.txt
//
//*****************************************************************************

#include "i2c.h"
#include "i2ceeprom.h"

// Standard I2C bit rates are:
// 100KHz for slow speed
// 400KHz for high speed

// functions
void i2ceepromInit(void)
{
    // although there is no code here
    // don't forget to initialize the I2C interface itself
}

u08 i2ceepromReadByte(u08 i2cAddr, u32 memAddr)
{
    u08 packet[2];
    // prepare address
    packet[0] = (memAddr>>8);
    packet[1] = (memAddr&0x00FF);
    // send memory address we wish to access to the memory chip
    // (this operation may fail if the device is busy -- repeat until success)
    while(i2cMasterSendNI(i2cAddr, 2, packet) != I2C_OK);
    // retrieve the data at this memory address
    i2cMasterReceiveNI(i2cAddr, 1, packet);
    // return data
    return packet[0];
}

void i2ceepromWriteByte(u08 i2cAddr, u32 memAddr, u08 data)
{
    u08 packet[3];
    // prepare address + data
    packet[0] = (memAddr>>8);
    packet[1] = (memAddr&0x00FF);
    packet[2] = data;
    // send memory address we wish to access to the memory chip
    // along with the data we wish to write
    // (this operation may fail if the device is busy -- repeat until success)
    while(i2cMasterSendNI(i2cAddr, 3, packet) != I2C_OK);
}

---