单片机模拟IIC总线与EEPROM进行数据通信

#include#define uchar unsigned charsbit sda=P2^0;sbit scl=P2^1;uchar a;void delay(){ ;; }void start()  //开始信号{  sda=1; delay(); scl=1; delay(); sda=0; delay();}void stop()   //停止{ sda=0; delay(); scl=1; delay(); sda=1; delay();}void respons()  //应答{ uchar i; scl=1; delay(); while((sda==1)&&(i<250))i++; scl=0; delay();}void init(){ sda=1; delay(); scl=1; delay();}void write_byte(uchar date){ uchar i,temp; temp=date; for(i=0;i<8;i++) {  temp=temp<<1;  scl=0;     delay();  sda=CY;  delay();  scl=1;  delay(); // scl=0;     //   delay(); } scl=0; delay(); sda=1; delay();}uchar read_byte(){ uchar i,k; scl=0; delay(); sda=1; delay(); for(i=0;i<8;i++) {  scl=1;  delay();   k=(k<<1)|sda;  scl=0;  delay();  } return k;}void delay1(uchar x){ uchar a,b; for(a=x;a>0;a--)  for(b=100;b>0;b--);}void write_add(uchar address,uchar date){ start(); write_byte(0xa0); respons(); write_byte(address); respons(); write_byte(date); respons(); stop();}uchar read_add(uchar address){ uchar date; start(); write_byte(0xa0); respons(); write_byte(address); respons(); start(); write_byte(0xa1); respons(); date=read_byte(); stop(); return date;}void main(){ init(); write_add(23,0xaa); delay1(100); P1=read_add(23); while(1);}