主:C89C54 从:AT24C02 电路图 时序图 下面是代码
#include <reg51.h> #define uchar unsigned char #define addr_x 0xae // 写 #define addr_d 0xaf// 读 sbit sda = P2^1; //数据管脚 sbit scl = P2^0; //时钟管脚 bit ack; void DelayUs2x(unsigned char t) //延时1 { while(--t); } void DelayMs(unsigned char t) //延时2 { while(t--) { //大致延时1mS DelayUs2x(245); DelayUs2x(245); } } void delay() //延时大于4μs {;;} void i2_qs() //起始信号 { sda = 1; //拉高数据 scl = 1; //拉高时钟 delay(); //延时大于 4μs sda = 0; //拉低数据产生起始信号(下降沿) delay(); //延时大于 4μs scl = 0; //拉低时钟 delay(); //延时大于 4μs } void i2_tz() //停止信号 { sda = 0; //拉低数据 scl = 1; //拉高时钟 delay();