24c04 for 51

//----------------------------------------24C04.c-------------------------------------------------------
// 24C04 IIC 读/写程序
//------------------------------------------------------------------------------------------------------


void Start()
{
  SDA = 1; SCL = 1; Delay4us(); SDA = 0; Delay4us(); SCL = 0;
}
//IIC停止
void Stop()
{
  SDA = 0; SCL = 0; Delay4us(); SCL = 1; Delay4us(); SDA = 1;
}

//IIC总线初始化
void IIC_24C04_Init()
{
  SCL = 0; Stop();
}

//发送应答信号
void ACK()
{
  SDA = 0; SCL = 1; Delay4us(); SCL = 0; SDA = 1;
}
 
//读取应答
void RACK()
{

  SDA = 1; Delay4us(); SCL = 1; Delay4us(); SCL = 0;
}


//发送非应答信号
void NO_ACK()
{
  SDA = 1; SCL = 1; Delay4us(); SCL = 0; SDA = 0;
}
  
//从24C04中读一字节
uchar RecByte()
{
  uchar i,d;
  d = 0x00;
  SDA = 1;
  for(i = 0; i < 8; i++)   
  {
    SCL = 1; d <<= 1; d |= SDA; Delay4us(); SCL = 0; Delay4us();
  }
  SCL = 0;
  Delay4us();
  return d;
} 
 
//向24C04中写一字节
uchar SendByte(uchar wd)
{
  uchar i;
  bit ack0;