I am trying to write to an external 24C04 4kbit Serial I2C bus EEPROM from my Arduino Mega 2560. The circuit is attached. This is the code I am using:
#include <Wire.h>
#define disk1 0x50 // Address of 24C04 eeprom chip
void setup() {
Serial.begin(19200);
Wire.begin();
unsigned int address = 1;
writeEEPROM(disk1, address, 0x23);
readEEPROM(disk1, address);
}
void loop(){}
/**
* Write data to the specified EEPROM.
*/
void writeEEPROM(int deviceaddress, unsigned int eeaddress, byte data ) {
Wire.beginTransmission(deviceaddress);
Wire.write((int)(eeaddress >> 8)); // MSB
Wire.write((int)(eeaddress & 0xFF)); // LSB
Wire.write(data);
Serial.println(Wire.endTransmission());
delay(20);
}
/**
* Read data from the EEPROM.
*/
void readEEPROM(int deviceaddress, unsigned int eeaddress ) {
Wire.beginTransmission(deviceaddress);
Wire.write((int)(eeaddress >> 8)); // MSB
Wire.write((int)(eeaddress & 0xFF)); // LSB
Serial.println(Wire.endTransmission());
Wire.requestFrom(deviceaddress,1);
if (Wire.available() > 0){
Serial.println(Wire.read(), HEX);
} else {
Serial.println("No data");
}
}
This code is available on this website; I modified it a bit.
This is the output I get:
0
0
No data
It means that Wire.endTransmission() returns successful, but still no data is available for reading.
Any idea how I can fix this?
