I2C.zip_i2c协议的eeprom

#include<reg51.h> #define uchar unsigned char #define uint unsigned int sbit SDA=P3^7; sbit SCL=P3^6; uchar code table[]={0x3f,0x06,0x5b,0x4f, 0x66,0x6d,0x7d,0x07, 0x7f,0x6f,0x77,0x7c, 0x39,0x5e,0x79,0x71,0}; uchar timecount,shu; void delay() { uchar i; for(i=0;i<15;i++); ; } void delay1(uchar i) { uchar j,k; for(j=i;j>0;j--) for(k=100;k>0;k--) ; } void init() { SDA=1; SCL=1; delay(); } void start() { SDA=1; SCL=1; delay(); SDA=0; delay(); SCL=0; } void stop() { SCL=0; SDA=0; delay(); SCL=1; delay(); SDA=1; } void response() { uchar i; SCL=0; delay(); SCL=1; SDA=1; delay(); while((SDA==1)&&(i<200)) i++; SCL=0; } void writedata(uchar dat) { uchar temp,i; temp=dat; SCL=0; delay(); for(i=0;i<8;i++) { temp<<=1; SDA=CY; delay(); SCL=1; delay(); SCL=0; delay(); } SDA=1; delay(); } uchar readdata() { uchar temp,i; SCL=0; delay(); //SDA=1; //delay(); for(i=0;i<8;i++) { temp<<=1; SCL=1; temp=temp|SDA; delay(); SCL=0; delay(); } SDA=1; return temp; } void writeadd(uchar address,uchar dat) { start(); writedata(0xa0); response(); writedata(address); response(); writedata(dat); response(); stop(); } uchar readadd(uchar address) { uchar temp; start(); writedata(0xa0); response(); writedata(address); response(); start(); writedata(0xa1); response(); temp=readdata(); stop(); return temp; } void display(uchar x) { uchar i,j; i=x/10; j=x%10; P2=0xfe; P0=table[j]; delay1(5); P2=0xff; P0=0; P2=0xfd; P0=table[i]; delay1(5); P2=0xff; P0=0 ; } void main() { //uchar temp; timecount=0; TMOD=0x01; EA=1; TH0=(65536-50000)/256; TL0=(65536-50000)%256; ET0=1; TR0=1; init(); shu=readadd(3); //init(); //writeadd(3,0xfe); //delay1(20); //temp=readadd(3); // P1=temp; while(1) { display(shu); } } void timer0() interrupt 1 { TH0=(65536-50000)/256; TL0=(65536-50000)%256; timecount++; if(timecount==20) { timecount=0; shu++; if(shu==60) shu=0; init(); writeadd(3,shu); } }