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不讲原理(网上详细讲原理的有很多)，只讲其代码实现。（说明：实测通过）
IIC.H文件
- #ifndef _IIC_C_
- #define _IIC_C_
- #include "STC12C5A60S2.H"
- #include "intrins.h"
- #define IIC_SDA P10
- #define IIC_SCL P11
- void IIC_IO_Init();
- void IIC_Delay();
- void Delayms(unsigned int ms);
- void IIC_Start();
- void IIC_Stop();
- void IIC_WriteByte(uchar Dat);
- unsigned char IIC_ReadByte();
- void IIC_Ack();
- bit IIC_WaitAck();
- void IIC_WriteData(unsigned char DeciceAddress,unsigned char RegisterAddress,unsigned char Dat);
- unsigned char IIC_ReadData(unsigned char DeciceAddress,unsigned char RegisterAddress);
- #endif
- #include "IIC.h"
- void Delayms(unsigned int ms) //毫秒级延时函数
- {
- unsigned char i, j;
- unsigned int k;
- for(k=0;k<ms;k++)
- {
- _nop_();
- i = 11;
- j = 190;
- do
- {
- while (--j);
- } while (--i);
- }
- }
- void Delay2us() //2us延时，用于稳定IO状态
- {
- unsigned char i;
- _nop_();
- _nop_();
- i = 2;
- while (--i);
- }
- void IIC_Delay() //IIC延时，需大于4.7us，这里取8us
- {
- unsigned char i;
- i = 19;
- while (--i);
- }
- void IIC_IO_Init() //IO口初始化，使总线处于空闲状态
- {
- IIC_SCL = 1;
- IIC_SDA = 1;
- }
- void IIC_Start() //总线开始
- {
- IIC_SDA = 1;
- IIC_SCL = 1;
- IIC_Delay();
-
- IIC_SDA = 0;
- IIC_Delay();
- IIC_SCL = 0;
- IIC_Delay();
- }
- void IIC_Stop() //总线结束
- {
- IIC_SCL = 0;
- IIC_SDA = 0;
- IIC_Delay();
- IIC_SCL = 1;
- IIC_Delay();
- IIC_SDA = 1;
- IIC_Delay();
- }
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