IIC.zip_51单片机_goldenj4u_stemseyk_teach1bd_集成电路

#include<reg52.h> #define uchar unsigned char #define uint unsigned int bit write=0; sbit sda=P2^0; sbit scl=P2^1; sbit wela=P2^7; sbit dula=P2^6; uchar sec,tcnt; uchar code table[]={ 0x3f,0x06,0x5b,0x4f, 0x66,0x6d,0x7d,0x07, 0x7f,0x6f,0x77,0x7c, 0x39,0x5e,0x79,0x71}; void delay() {;;} void delayms(uint z) { uint i,j; for(i=z;i>0;i--) for(j=110;j>0;j--); } void start() { sda=1; delay(); scl=1; delay(); sda=0; delay(); } void stop() { sda=0; delay(); scl=1; delay(); sda=1; delay(); } void respons() { 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(); 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 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 display(uchar bai_c,uchar sh_c) { dula=0; P0=table[bai_c]; dula=1; dula=0; wela=0; P0=0xfe; wela=1; wela=0; delayms(5); dula=0; P0=table[sh_c]; dula=1; dula=0; wela=0; P0=0xfd; wela=1; wela=0; delayms(5); } void main() { init(); sec=read_add(2); if(sec>100) sec=0; TMOD=0x01; ET0=1; EA=1; TH0=(65536-50000)/256; TL0=(65536-50000)%256; TR0=1; while(1) { display(sec/10,sec%10); if(write==1) { write=0; write__add(2,sec); } } } void t0()interrupt 1 { TH0=(65536-50000)/256; TL0=(65536-50000)%256; tcnt++; if(tcnt==20) { tcnt=0; sec++; write=1; if(sec==100) sec=0; } }