51单片机 模拟i2c 接口

/* 89c52 软件模拟I2C 接口 33.1776MHZ */ #include "STC89C51RC.h" #include"IIC.h" #define uchar unsigned char #define uint unsigned int uchar total; uchar testdat[5]={0x01,0x02,0x03,0x11,0x5a}; uchar tempp[5]; //串口初始化 void Communications_Init(void) { PCON &= 0x7F; //波特率不倍速 SCON = 0x50; //8位数据,可变波特率 AUXR &= 0xBF; //定时器1时钟为Fosc/12,即12T AUXR &= 0xFE; //串口1选择定时器1为波特率发生器 TMOD &= 0x0F; //清除定时器1模式位 TMOD |= 0x20; //设定定时器1为8位自动重装方式 TL1 = 0xF7; //设定定时初值 TH1 = 0xF7; //设定定时器重装值 ET1 = 0; //禁止定时器1中断 TR1 = 1; //启动定时器1 } //串口发送数据1字节 void Send_Uart(unsigned char a_s) { ES=0; TI=0; SBUF=a_s; while(!TI); TI=0; ES=1; } void Delay1ms() //@33.1776MHz { unsigned char i, j; i = 6; j = 93; do { while (--j); } while (--i); } //write one data void W24c02(uchar address,uchar dat) { IIC_start(); IIC_write(0xa0); //写从器件地址 IIC_write(address); //字节地址 IIC_write(dat); //写数据 IIC_stop(); } //read one data uchar R24c02(uchar address) { uchar temp; IIC_start(); IIC_write(0xa0); //写从器件地址 IIC_write(address); //字节地址 IIC_start(); IIC_write(0xa1); //写从器件地址 temp=IIC_read(); IIC_stop(); return temp; } //写多字节 void Wm24c02(uchar address,uchar *dat,uchar un) { uchar i; IIC_start(); IIC_write(0xa0); //写从器件地址 IIC_write(address); //字节地址 for(i=0;i<un;i++) { IIC_write(dat[i]); //写数据 } IIC_stop(); } //读多字节 void Rm24c02(uchar address,uchar *dat,uchar un) { uchar i=0; IIC_start(); IIC_write(0xa0); //写从器件地址 IIC_write(address); //字节地址 IIC_start(); IIC_write(0xa1); //写从器件地址 dat[0]=IIC_read(); for(i=1;i<un;i++) { IIC_ack(); dat[i]=IIC_read(); } IIC_stop(); } void main() { uchar i; EA = 1; //开总中断 ES = 1; //允许串口中断 P2M1=0X00; P2M0=0X00; Communications_Init(); // Send_Uart(0x99); // W24c02(0x00,0x02); Wm24c02(0x00,testdat,5); while(1) { if(total!=0x00) { Rm24c02(0x00,tempp,5); for(i=0;i<5;i++) Send_Uart(tempp[i]); // W24c02(0xff,0xfd); // i=R24c02(0x00); // Send_Uart(i); total=0x00; } } } //串口接收中断函数 void serial(void) interrupt 4 using 0 { while(!RI); RI=0; total=SBUF; }