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Das bezieht sich auf den EEPROM im Kontroller.Nun lese ich aber etwas von eeprom_read_byte auf microcontroller.net.
Die Device-Adresse sollte A8 sein?
Vielleicht kannst du mit dem hier was anfangen:
Bezieht sich zwar auf einen 24C02 sollte aber sonst passen.Code:/**************************************************************************** Title: Access serial EEPROM 24C02 using I2C interace Author: Peter Fleury <pfleury@gmx.ch> http://jump.to/fleury Date: 9-Mar-2003 Software: AVR-GCC 3.3 Hardware: AT90S8515 at 4 Mhz, any AVR device can be used Description: This example shows how the I2C library i2cmaster.S can be used to access a serial eeprom. Based on Atmel Application Note AVR300, adapted to AVR-GCC C interface *****************************************************************************/ #include <avr/io.h> #include "i2cmaster.h" #define Dev24C02 0xA2 // device address of EEPROM 24C02, see datasheet int main(void) { unsigned char ret; DDRB = 0xff; // use all pins on port B for output PORTB = 0xff; // (active low LED's ) i2c_init(); // init I2C interface /* write 0x75 to eeprom address 0x05 (Byte Write) */ ret = i2c_start(Dev24C02+I2C_WRITE); // set device address and write mode if ( ret ) { /* failed to issue start condition, possibly no device found */ i2c_stop(); PORTB=0x00; // activate all 8 LED to show error */ }else { /* issuing start condition ok, device accessible */ i2c_write(0x05); // write address = 5 i2c_write(0x75); // ret=0 -> Ok, ret=1 -> no ACK i2c_stop(); // set stop conditon = release bus /* write ok, read value back from eeprom address 0x05, wait until the device is no longer busy from the previous write operation */ i2c_start_wait(Dev24C02+I2C_WRITE); // set device address and write mode i2c_write(0x05); // write address = 5 i2c_rep_start(Dev24C02+I2C_READ); // set device address and read mode ret = i2c_readNak(); // read one byte i2c_stop(); PORTB = ~ret; // output byte on the LED's /* write 0x70,0x71,072,073 to eeprom address 0x00..0x03 (Page Write), wait until the device is no longer busy from the previous write operation */ i2c_start_wait(Dev24C02+I2C_WRITE); // set device address and write mode i2c_write(0x00); // write start address = 0 i2c_write(0x70); // write data to address 0 i2c_write(0x71); // " " " " 1 i2c_write(0x72); // " " " " 2 i2c_write(0x74); // " " " " 3 i2c_stop(); // set stop conditon = release bus /* write ok, read value back from eeprom address 0..3 (Sequencial Read), wait until the device is no longer busy from the previous write operation */ i2c_start_wait(Dev24C02+I2C_WRITE); // set device address and write mode i2c_write(0x00); // write address = 0 i2c_rep_start(Dev24C02+I2C_READ); // set device address and read mode ret = i2c_readAck(); // read one byte form address 0 ret = i2c_readAck(); // " " " " " 1 ret = i2c_readAck(); // " " " " " 2 ret = i2c_readNak(); // " " " " " 3 i2c_stop(); // set stop condition = release bus PORTB = ~ret; // output byte on the LED's } for(;;); }
=64x16x8
Zitat von MechMac
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