24C02读写练习详细(C语言新手细看).doc

24C02读写练习详细(C语言新手细看)#include #include #defineOP_READ0xa1/ 器件地址以及读取操作#defineOP_WRITE 0xa0/ 器件地址以及写入操作#defineMAX_ADDR 0x7f/ AT24C02最大地址unsigned char code dis_code = 0x7e,0xbd,0xdb,0xe7,0xdb,0xbd,0x7e,0xff;/ 写入到AT24C01的数据串sbit SDA = P34;sbit SCL = P33;void start();void stop();unsigned char shin();bit shout(unsigned char write_data);unsigned char read_random(unsigned char random_addr);void write_byte( unsigned char addr, unsigned char write_data);void fill_byte(unsigned char fill_data);void delayms(unsigned char ms);main(void)unsigned char i;SDA = 1;SCL = 1;fill_byte(0xff);/ 全部填充0xfffor(i = 0 ; i 8; i+)/写入显示代码到AT24Cxxwrite_byte(i, dis_codei);i = 0;while(1)P0 = read_random(i);/ 循环读取24Cxx内容，并输出到P0口i+;i &= 0x07;/ 循环读取范围为0x000x07delayms(250);void start()/ 开始位SDA = 1;SCL = 1;_nop_();_nop_();SDA = 0;_nop_();_nop_();_nop_();_nop_();SCL = 0;void stop()/ 停止位SDA = 0;_nop_();_nop_();SCL = 1;_nop_();_nop_();_nop_();_nop_();SDA = 1;unsigned char shin()/ 从AT24Cxx移入数据到MCUunsigned char i,read_data;for(i = 0; i 8; i+)SCL = 1;read_data = 1;read_data |= (unsigned char)SDA;SCL = 0;return(read_data);bit shout(unsigned char write_data)/ 从MCU移出数据到AT24Cxxunsigned char i;bit ack_bit;for(i = 0; i 8; i+)/ 循环移入8个位SDA = (bit)(write_data & 0x80);_nop_();SCL = 1;_nop_();_nop_();SCL = 0;write_data = 1;SDA = 1;/ 读取应答_nop_();_nop_();SCL = 1;_nop_();_nop_();_nop_();_nop_();ack_bit = SDA;SCL = 0;return ack_bit;/ 返回AT24Cxx应答位void write_byte(unsigned char addr, unsigned char write_data)/ 在指定地址addr处写入数据write_datastart();shout(OP_WRITE);shout(addr);shout(write_data);stop();delayms(10);/ 写入周期void fill_byte(unsigned char fill_data)/ 填充数据fill_data到EEPROM内unsigned char i;for(i = 0; i MAX_ADDR; i+)write_byte(i, fill_data);unsigned char read_current()/ 在当前地址读取unsigned char read_data;start();shout(OP_READ);read_data = shin();stop();return read_data;unsigned char read_random(unsigned char random_addr)/ 在指定地址读取start();shout(OP_WRITE);shout(random_addr);retur