24 系列存储器驱动.zip

#include <reg51.h> #include <intrins.h> #define somenop(); _nop_();_nop_();_nop_();_nop_();_nop_(); sbit SDA=0x91; sbit SCL=0x90; void I2CStart(void) { SDA=1; somenop(); SCL=1; somenop(); SDA=0; somenop(); SCL=0; somenop(); } void I2CStop(void) { SDA=0; somenop(); SCL=1; somenop(); SDA=1; somenop(); SCL=0; somenop(); } void I2CInit(void) { SCL=0; somenop(); I2CStop(); } bit I2CClock(void) { bit temp; somenop(); SCL=1; _nop_();_nop_();_nop_(); temp=SDA; _nop_();_nop_(); SCL=0; somenop(); return(temp); } bit I2CSendByte(char I2CData) { register unsigned char i; for(i=0;i<8;i++) { SDA=(bit)(I2CData&0x80); I2CData<<=1; I2CClock(); } SDA=1; return(~I2CClock()); } unsigned char I2CReceiveByte(void) { unsigned char I2CData=0; register unsigned char i; for(i=0;i<8;i++) { I2CData<<=1; if(I2CClock()) I2CData++; } return(I2CData); } void I2CSendAck(void) { SDA=0; I2CClock(); SDA=1; } void I2CSendNotAck(void) { SDA=1; I2CClock(); SDA=1; } void Send(void) { I2CInit(); I2CStart(); I2CSendByte(0xA0); I2CSendByte(0x80); I2CSendByte(0x77); I2CStop(); } void Receive(void) { I2CStart(); I2CSendByte(0xA0); I2CSendByte(0x80); I2CStart(); I2CSendByte(0xA1); ACC=I2CReceiveByte(); I2CSendNotAck(); I2CStop(); } void main(void) { Send(); Receive(); }