51单片机IIC通信底层程序

#include"IIC.H"#include <intrins.h>unsigned char ask; void delay(){  _nop_();   _nop_();    _nop_();     _nop_();      _nop_();       _nop_();}void IICinit(){  SDA=1;  delay();  SCL=1;  delay();  SDA=0;  delay();  SCL=0;}void IICstart(){  SDA=1;  delay();  SCL=1;  delay();  SDA=0;  delay();  SCL=0;}void IICrespons(){  unsigned char i=0;  SCL=1;  delay();  while((SDA==1)&&(i<255))     i++;  SCL=0;  delay();}void IICstop(){  SDA=0;  delay();  SCL=1;  delay();  SDA=1;  delay();  SCL=0;}void IICwritebyte(unsigned char date){  unsigned char i,temp;  temp=date;  for(i=0;i<8;i++)  {    temp=temp<<1;SCL=0;delay();SDA=CY;delay();SCL=1;delay();  }  SCL=0;  delay();  SDA=1;  delay();}unsigned char IICreadbyte(){  unsigned char i,k;  SCL=0;  delay();  SDA=1;  for(i=0;i<8;i++)  {    SCL=1;delay();k=(k<<1)|SDA;SCL=0;delay();  }  delay();  return k;  }