avr单片机IIc总线编程-EDA365

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avr单片机IIc总线编程

发布时间：

#define IIC_Start() TWCR =(1<#define IIC_Stop() TWCR =(1< #define IIC_Wait() while(!(TWCR&(1< #define IIC_NoneAck() TWCR =(1< #define IIC_Ack() TWCR =(1<

/*=========================================

IicWrite(uchar ad,uchar da)：ad=寄存器地址,da=数据;
IicRead(uchar ad):           ad=寄存器地址
=========================================*/
void IicWrite(uchar ad,uchar da)
{
     IIC_Start();
     IIC_Wait();
     TWDR=0xA2;//从机地址
     IIC_Ack();
     IIC_Wait();
     TWDR=ad;
     IIC_Ack();
     IIC_Wait();
     TWDR=da;
     IIC_Ack();
     IIC_Wait();
     IIC_Stop();
}
uchar IicRead(uchar ad)
{
unsigned char data;
IIC_Start();
IIC_Wait();
TWDR = 0xA2;//从机地址
IIC_Ack();
IIC_Wait();
TWDR = ad;
IIC_Ack();
IIC_Wait();

IIC_Start();
IIC_Wait();
TWDR = 0xA3;
IIC_Ack();
IIC_Wait();
IIC_NoneAck();
IIC_Wait();
data=TWDR;
IIC_Stop();
return data;
}