项目中用到的,实测OK

C文件

#include "eeprom.h"
// 豪秒延时标准程序


static void Delay(unsigned char time)
{
  volatile unsigned char  a, b;
  
  for (b = time; b>0; b--) {
    for (a = 15; a>0; a--)
    {
     GCC_CLRWDT();	
    }
    
   
  }
}



void IIC_Init()
{
  OUT_SDA();
  OUT_SCL();
  SET_SDA();
  SET_SCL();
  SDA_PUL();
  SCL_PUL();
 
}
static void Start()
{
  SET_SDA();
  OUT_SDA();
  SET_SCL();
  Delay(1);
  CLR_SDA();
  Delay(1);
  CLR_SCL();
  Delay(1);
}


static void Stop()//
{
  CLR_SCL();
  OUT_SDA();
  CLR_SDA();
  Delay(1);
  SET_SCL();
  Delay(1);
  SET_SDA();
}


static unsigned char ReceiveByte()//
{
  unsigned char  i;
 unsigned char   buffer;
  buffer = 0;
  IN_SDA();

  for (i = 0; i < 8; i++) {
    CLR_SCL();
    Delay(2);
    SET_SCL();
    Delay(2);
    if (SDA()) {
      buffer |= 0x01;
    }
    if (i < 7) {
      buffer <<= 1;
    }
  }

  CLR_SCL();
  OUT_SDA();
  CLR_SDA();

  return (buffer);
}


static unsigned char SendByteAndGetNACK(unsigned char dataToSend)            //发送数据 没有ACK
{
  unsigned char  i;
  unsigned char  ack;

  for (i = 0; i < 8; i++) {
    CLR_SCL();
    Delay(1);
    if (dataToSend & 0x80) {
      SET_SDA();
    }
    else {
      CLR_SDA();
    }
    Delay(1);
    SET_SCL();
    Delay(1);

    dataToSend <<= 1;
  }

  CLR_SCL();
  Delay(1);

  IN_SDA();
  Delay(1);
  SET_SCL();
  Delay(2);

  ack = SDA();

  CLR_SCL();
  Delay(1);
  OUT_SDA();
  CLR_SDA();
  Delay(1);


  return (ack);
}


 void Respond(unsigned char ACKSignal)     //
{
  OUT_SDA();
  CLR_SDA();
  CLR_SCL();
  if (ACKSignal) {
    SET_SDA();
  }
  else {
    CLR_SDA();
  }
  Delay(1);
  SET_SCL();
  Delay(1);
  CLR_SCL();
}
/**********************************************************************************
EEPROM写
***********************************************************************************/
void Eeprom_Write(unsigned char  Addr,unsigned char dat)
{

  Start();
  SendByteAndGetNACK(0xA0); //写地址
  SendByteAndGetNACK(Addr);
  SendByteAndGetNACK(dat);
  Stop();
  Delay(250);


}

/**********************************************************************************
EEPROM读
***********************************************************************************/

unsigned char  Eeprom_Read(unsigned char Addr)
{

  unsigned char  dat;
  Start();

  SendByteAndGetNACK(0xA0); //发送设备地址
  SendByteAndGetNACK(Addr);
  Start();    //再发送一次开始信号

  SendByteAndGetNACK(0xA1);//发送读设备地址
  dat= ReceiveByte();//读取数据



  Respond(NACK);
  Stop();

  return   dat;

}

H文件

#define NACK    1
#define ACK     0

#define SET_SDA()   _pa1=1
#define CLR_SDA()   _pa1=0
#define OUT_SDA()   _pac1=0
#define IN_SDA()    _pac1=1
#define SDA()       _pa1
#define SDA_PUL()   _papu1=1

#define SET_SCL()   _pa3=1
#define CLR_SCL()   _pa3=0
#define OUT_SCL()   _pac3=0
#define IN_SCL()    _pac3=1
#define SCL_PUL()   _papu3=1

extern void Eeprom_Write(unsigned char  Addr,unsigned char dat);
extern unsigned char  Eeprom_Read(unsigned char Addr);