AT24c1024 c程序

#include  "lpc23xx.h" 
#include  "AT24c1024.H"
#include  "uart0.h"
  
#include  "variable.h"

#define SD2401_SCL    1<<9
#define SD2401_SDA    1<<8


#define SDA_out   FIO0DIR=FIO0DIR|SD2401_SDA      //设为输出
#define SDA_in    FIO0DIR=FIO0DIR&(~(SD2401_SDA)) //设为输入


void I2CWait(unsigned int wait_count)             //IIC中用到的延时时间
{
   unsigned int wait_buff;
   wait_buff=wait_count;
   while(wait_buff)wait_buff=wait_buff-1;
}

void I2CStart(void)           //发送起始信号
{
   SDA_out;
   FIO0SET=SD2401_SDA;
   FIO0SET=SD2401_SCL;
   I2CWait(50);               //延时大约8uS
   FIO0CLR=SD2401_SDA;
   I2CWait(50);               //延时大约8uS
   FIO0CLR=SD2401_SCL;

   SDA_in;
}

void I2CStop(void)            //发送停止信号
{
   SDA_out;
   FIO0CLR=SD2401_SDA;
   FIO0CLR=SD2401_SCL;
   I2CWait(50);              //延时大约8uS
   FIO0SET=SD2401_SCL;
   I2CWait(50);              //延时大约8uS
   FIO0SET=SD2401_SDA;
   SDA_in;
}

unsigned char WaitAck(void)  //等待应答信号
{
   unsigned int errtime=500;
   SDA_out;
   FIO0SET=SD2401_SDA;
   I2CWait(50);              //延时大约8uS
   FIO0SET=SD2401_SCL;
   I2CWait(50);          //延时大约8uS
   SDA_in;
   while(FIO0PIN&SD2401_SDA) //数据线拉低或errtime减到0，顺序执行
   {
      errtime--;
      if (!errtime) 
      {
    I2CStop();