00001 /*! \file i2ceeprom.c \brief Interface for standard I2C EEPROM memories. */ 00002 //***************************************************************************** 00003 // 00004 // File Name : 'i2ceeprom.c' 00005 // Title : Interface for standard I2C EEPROM memories 00006 // Author : Pascal Stang - Copyright (C) 2003 00007 // Created : 2003.04.23 00008 // Revised : 2003.04.23 00009 // Version : 0.1 00010 // Target MCU : Atmel AVR series 00011 // Editor Tabs : 4 00012 // 00013 // This code is distributed under the GNU Public License 00014 // which can be found at http://www.gnu.org/licenses/gpl.txt 00015 // 00016 //***************************************************************************** 00017 00018 #include <avr/io.h> 00019 #include <avr/interrupt.h> 00020 00021 #include "i2c.h" 00022 #include "i2ceeprom.h" 00023 00024 // Standard I2C bit rates are: 00025 // 100KHz for slow speed 00026 // 400KHz for high speed 00027 00028 // functions 00029 void i2ceepromInit(void) 00030 { 00031 // although there is no code here 00032 // don't forget to initialize the I2C interface itself 00033 } 00034 00035 u08 i2ceepromReadByte(u08 i2cAddr, u32 memAddr) 00036 { 00037 u08 packet[2]; 00038 // prepare address 00039 packet[0] = (memAddr>>8); 00040 packet[1] = (memAddr&0x00FF); 00041 // send memory address we wish to access to the memory chip 00042 i2cMasterSendNI(i2cAddr, 2, packet); 00043 // retrieve the data at this memory address 00044 i2cMasterReceiveNI(i2cAddr, 1, packet); 00045 // return data 00046 return packet[0]; 00047 } 00048 00049 void i2ceepromWriteByte(u08 i2cAddr, u32 memAddr, u08 data) 00050 { 00051 u08 packet[3]; 00052 // prepare address + data 00053 packet[0] = (memAddr>>8); 00054 packet[1] = (memAddr&0x00FF); 00055 packet[2] = data; 00056 // send memory address we wish to access to the memory chip 00057 // along with the data we wish to write 00058 i2cMasterSendNI(i2cAddr, 3, packet); 00059 }