EEPROM.rar_52 EEPROM_AT51EEPROM_EEPROM AT89C51_eeprom

#include<reg52.h> #define uint unsigned int #define uchar unsigned char sbit rs=P1^0; sbit rw=P1^1; sbit lcden=P1^2; sbit sda=P2^7; sbit scl=P2^6; uchar a; //延时函数 void long_delay(int x) { int a,b; for(a=0;a<x;a++) for(b=0;b<10;b++); } void delay() { ;; } //液晶函数 //写指令函数 void write_com(uchar com) { P0=com; rw=0; rs=0; lcden=0; long_delay(10); lcden=1; long_delay(10); lcden=0; } //写数据函数 void write_date(uchar date) { P0=date; rw=0; rs=1; lcden=0; long_delay(10); lcden=1; long_delay(10); lcden=0; } //液晶初始化函数 void lcd_init() { long_delay(500); write_com(0x38); long_delay(20); write_com(0x0f); long_delay(20); write_com(0x06); long_delay(20); write_com(0x01);//清屏指令 long_delay(20); } //EEPROM函数 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 eeprom_init() //初始化 { sda=1; delay(); scl=1; delay(); } //写字节函数 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(); } //读字节函数 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; } //写地址函数 void write_add(uchar address,uchar date) { start(); write_byte(0xa0); respons(); write_byte(address); respons(); write_byte(date); respons(); stop(); } //读地址函数 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; } //主函数 void main() { uchar i=0; while(1) { eeprom_init(); lcd_init(); for(i=34;i<255;i++) { write_add(i,i); long_delay(10); } for(i=0;i<15;i++) { write_com(0x80); long_delay(20); write_date(read_add(i+34)); long_delay(4000); } } }