[En-Nut-Discussion] TWI initialization - new attempt

[Peter Sodermanns]

Tim Tait schrieb:
> 
> The SCL and SDA lines must idle HIGH. The AVR master will assume another 
> master has the bus if it sees SCL low. Those 2 lines should be pulled 
> high after a reset, and stay that way until AVR master starts to send 
> TWI transactions. So that may be your problem, the next question is why.
> 

Hey, You got it!
My pull ups where tied to ground instead of +5V. And I didn't check that 
end!
Now the pins are toggling, and I've new hope to get my program running.

Many thanks for the hint!

                 Peter