Hi All,
I have implemented a driver for I2C Master TWI on SAM9G45(TWI).

My customer is complaining, that my I2C Master driver hangs, when nothing is connected to the TWI interface pins. (no device, no pullups at all). In that case the pins should be at low level statically.

I reviewed the TWI documentation and I cannot find a solution. As I understand, the TWI interface is detecting a blocked bus in this case and will wait till the data line becomes high (means bus free).
Unfortunately there is no Arbitration Lost (ARBLST) signaled! As I understand, ARBLST would be signaled only, if a bus collision is detected after a transmission is already started.

Is there any possibility to get a signal (interrupt) when starting a transmission on an unconnected bus?

Thanks
Richard