51单片机i2c存储器24c02驱动程序

这是电路图，这是从这个项目中取得的文件里面有电路图和仿真文件：http://www.ruidan.com/bbs/dpj-22586-1.html 下面是 i2c.c文件： #include <reg52.h> #include "i2c.h" #include "delay_ms.h" void delay() { ;; } void i2cinit()//总线初始化 { SDA = 1; delay(); SCL = 1; delay(); } void start()//启动信号 { SDA = 1; SCL = 1; delay(); SDA = 0; delay(); } void stop()//停止信号 { SDA = 0; delay(); SCL = 1; delay(); SDA = 1; delay(); } void respons()//应答信号 { unsigned char i = 0; SCL = 1; delay(); while(SDA == 1 && i < 255)//等待应答，过一段时间不应答退出循环 i++; SCL = 0; delay(); } void writebyte(unsigned char date)//写一个字节 { unsigned char i,temp; temp = date; for(i = 0; i < 8; i++) { temp <<= 1;//temp左移一位后高位进CY SCL = 0; delay(); SDA = CY; delay(); SCL = 1; delay(); } SCL = 0;//应答信号中SCL = 1，所以这里要置0 delay(); SDA = 1;//用完要释放数据总线 delay(); } unsigned char readbyte()//读一个字节 { unsigned char i,k; SCL = 0; delay(); SDA = 1; for(i = 0; i < 8; i++) { SCL = 1; delay(); k = (k << 1) | SDA; //和最低位或，一位位送到K SCL = 0; delay(); } delay(); return k; } void write_add(unsigned char address,unsigned char date)//向地址写一个字节数据 { start(); writebyte(0xa0);//A0,A1,A2接地，AT24C02芯片地址为1010，送控制字为1010A2A1A0R/~W respons(); writebyte(address); respons(); writebyte(date); respons(); stop(); } unsigned char read_add(unsigned char address)//向地址读一个字节数据 { unsigned char date; start(); writebyte(0xa0);//A0,A1,A2接地，AT24C02芯片地址为1010，送控制字为1010A2A1A0R/~W respons(); writebyte(address); respons(); start(); writebyte(0xa1);//A0,A1,A2接地，AT24C02芯片地址为1010，送控制字为1010A2A1A0R/~W respons(); date = readbyte(); stop(); return date; }

//向地址写n个字节数据,数据存放在指针P指的数组中 void write_n_add(unsigned char * p,unsigned char address,unsigned char n) { unsigned char i; for(i = 0; i < n; i++) { write_add((address + i),*(p + i)); delay_ms(20);//一定要适当延时，不然写不进去 } } //向地址读n个字节数据,数据存放在指针P指的数组中 void read_n_add(unsigned char * p,unsigned char address,unsigned char n) { unsigned char i; for(i = 0; i < n; i++) { *(p + i) = read_add(address + i); } }

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