ATMEL 24C256 EEPROM驱动代码

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24C256驱动代码 for Arduino

A0,A1,A2高电平，地址 0x50

连接方法：

如果使用Arduino UNO，Arduino pro mini，Arduino Micro

将芯片6脚连接Arduino A4（SDA），7脚连接Arduino A5（SCL）

示例读写程序：

int deviceaddress = 0x50  ;  void writeTest(){  Wire.begin();     unsigned int address = 0;   writeEEPROM(address, 123);  Serial.print(readEEPROM(address), DEC);}void writeEEPROM(unsigned int eeaddress, byte data ) {  Wire.beginTransmission(deviceaddress);  Wire.write((int)(eeaddress >> 8));   // MSB  Wire.write((int)(eeaddress & 0xFF)); // LSB  Wire.write(data);  Wire.endTransmission();   delay(5);} byte readEEPROM(unsigned int eeaddress ) {  byte rdata = 0xFF;   Wire.beginTransmission(deviceaddress);  Wire.write((int)(eeaddress >> 8));   // MSB  Wire.write((int)(eeaddress & 0xFF)); // LSB  Wire.endTransmission();   Wire.requestFrom(deviceaddress,1);   if (Wire.available()) rdata = Wire.read();   return rdata;}

参考：http://www.hobbytronics.co.uk/arduino-external-eeprom

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