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標題: AVR I2C通信程序 [打印本頁]

作者: wind19890 時間: 2016-5-9 09:08
標題: AVR I2C通信程序
uchar SDA_Return(void)//0-low level  1-hign level
{
   uchar flag;
   uchar oldSREG=SREG;
   SREG&=~(_BV(7));
DDRC&=0xfd;
PORTC|=_BV(PC1);
if((PINC&_BV(PC1)) !=0)//0000 0010
      flag=1;
else
      flag=0;
SREG=oldSREG;
return flag;
}

void delay(void)
{
;
;
}

void start(void)
{
SDA_1;
delay();
SCL_1;
delay();
SDA_0;
delay();

}

void stop(void)
{

SDA_0;
delay();
SCL_1;
delay();
SDA_1;
delay();
}

void respons(void)
{
uchar i=0;
SCL_1;
delay();
while((SDA_Return())&&(i<250))i++;
SCL_0;
delay();
}

void I2C_init(void)
{
SDA_1;
delay();
SCL_1;
delay();
}

void write_byte(unsigned char i)
{
unsigned char temp,num=0;
for(temp=0;temp<8;temp++)
{
      num=i&0x80;
      SCL_0;
      delay();
      if(num==0)
         {SDA_0; }
      else
         {SDA_1; }


      delay();
SCL_1;
delay();
i=i<<1;
delay();

}
SCL_0;
delay();
SDA_0;
delay();
}

uchar read_byte(void)
{
uchar i,j,value=0;
SCL_0;
for(i=0;i<8;i++)
{
value<<=1;
value|=SDA_Return();
SCL_1;
delay();
//delay();
SCL_0;
delay();

}
return value;
}

void Ack_I2c(void)
{
SDA_0;
delay();
SCL_1;
delay();
SCL_0;
delay();
SDA_1;
}

void NAck_I2c(void)
{

SDA_1;
delay();
SCL_1;
delay();
SCL_0;
delay();

}

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