routine to read i2c device

[Daljeet12]

I need help on following routine

routine to read i2c device

unsigned char I2CRead()
{
	unsigned char i, Data=0;
	for (i = 0; i < 8; i++) {
		SCL = 1;
		if(SDA)
			Data |=1;
		if(i<7)
			Data<<=1;
		SCL = 0;
	}
	return Data;
}

What it would be return in loop1 loop2 and loop 3 ?

 

[KlausST]

Hi,

What it would be return in loop1 loop2 and loop 3 ?

The series to parallel shifted signal of SDA. MSB first.

BTW:
* I2C needs to keep on timing and needs to keep on protocol (like addresing a device).
* Most mucrocontrollers include I2C hardware interface.
* Read the I2C specification.

Klaus