I2C-E2PROM.zip

#include <reg52.h> extern void InitLcd1602(void); extern void LcdShowStr(unsigned char x, unsigned char y, unsigned char *str); extern void I2CStart(void); extern void I2CStop(void); extern bit I2CWrite(unsigned char dat); extern unsigned char I2CReadNAK(void); extern unsigned char I2CReadACK(void); void MemToStr(unsigned char *str, unsigned char *src, unsigned char len); void E2PRead(unsigned char *buf, unsigned char addr, unsigned char len); void E2PWrite(unsigned char *buf, unsigned char addr, unsigned char len); void main(void) { unsigned char i; unsigned char buf[5]; unsigned char str[20]; InitLcd1602(); E2PRead(buf,0x90,sizeof(buf)); MemToStr(str,buf,sizeof(buf)); LcdShowStr(0,0,str); for(i=0; i<sizeof(buf); i++) { buf[i] = buf[i] + 1 + i; } E2PWrite(buf,0x90,sizeof(buf)); while(1){} } void MemToStr(unsigned char *str, unsigned char *src, unsigned char len) { unsigned char tmp; while(len--) { tmp = *src >> 4; if(tmp <= 9) { *str++ = tmp + '0'; } else { *str++ = tmp - 10 + 'A'; } tmp = *src & 0x0F; if(tmp <= 9) { *str++ = tmp + '0'; } else { *str++ = tmp - 10 + 'A'; } *str++ = ' '; src++; } *str = '\0'; } void E2PRead(unsigned char *buf, unsigned char addr, unsigned char len) { do { I2CStart(); //开始 if(I2CWrite(0x50<<1)) //写机器号-写 { break; } I2CStop(); }while(1); I2CWrite(addr); //写地址 I2CStart(); //开始 I2CWrite((0x50<<1)|0x01); //写机器号-读 while(len>1) { *buf++ = I2CReadACK(); //读数据 len--; } *buf = I2CReadNAK(); I2CStop(); //停止 } void E2PWrite(unsigned char *buf, unsigned char addr, unsigned char len) { while(len--) { do { I2CStart(); if(I2CWrite(0x50<<1)) { break; } I2CStop(); }while(1); I2CWrite(addr++); I2CWrite(*buf++); I2CStop(); } }