Hello Pete.
I've changed the (1) with the () ind the write, but it doesn't make any change. Still wrong data in the EEPROM.
The sketch in now as below :
#include <Wire.h> // for I2C
#define i2caddr 0x50 // device address
byte d=0; // data to store in or read from the EEPROM
void setup()
{
Serial.begin(9600); // Initialize the serial line
Wire.begin(); // wake up the I2C
Serial.println("Writing data...");
for (int i=0; i<257; i++)
{
writeData(i,i);
}
Serial.println("DONE");
Serial.println("Reading data...");
for (int i=0; i<257; i++)
{
Serial.print(i);
Serial.print(" : ");
d=readData(i);
Serial.println(d, DEC);
}
Serial.println("DONE");
}
// writes a byte of data in memory location addr
void writeData(unsigned int addr, byte data)
{
Wire.beginTransmission(i2caddr);
// set the pointer position
//Wire.write((int)(addr >> 8));
Wire.write((int)(addr & 0xFF));
Wire.write(data);
Wire.endTransmission();
delay(10);
}
// reads a byte of data from memory location addr
byte readData(unsigned int addr)
{
byte result;
Wire.beginTransmission(i2caddr);
// set the pointer position
//Wire.write((int)(addr >> 8));
Wire.write((int)(addr & 0xFF));
Wire.endTransmission(1);
Wire.requestFrom(i2caddr,1); // get the byte of data
result = Wire.read();
return result;
}
void loop()
{
}
By the way. I'm having so hard time with this I2C EEPROM, would you have any good link with some sketches very well explained. I haven't been able to find something that could help me properly yet !
At the end, my project is to reprogram a Laser printer chip.
So, read an EEPROM (brand new and already programmed), then, write the data to the old one, so I've got a spare one.
I'll need some advice to do this. I've already read the data of the new 24C04.
I'll now need to inject these data in the old one.
EepromWR2.ods (10.2 KB)