does I2C functions handle errors?

alexbilo · Joined: 01 Jun 2004 Posts: 39 Location: Trois-Rivières

Hi,

I'm about to implement an I2C bus between two PIC18F452. Since this communication is critical to the system, I want to be able to know if the slave ACKs the data transfers. There's no documentation on this issue in CCS compiler... I just want to know what i2c_write() will do in this situation and if I can still read the ACKSTAT bit after the call to i2c_write().

Thanks
_________________
Alex

rnielsen · Joined: 23 Sep 2003 Posts: 852 Location: Utah

If you will examine the help file it states that the i2c_write() function returns the ACK bit. 0 means ACK and 1 means NO ACK. So, if you had a statement that read:

check_ack = i2c_write(address);

or

if(!i2c_write(address))// enters 'if' statement if ACK'd

you could check to see if the device ACK'd back.

Ronald