[En-Nut-Discussion] Missing TWI Functions TwMasterRegRead and TwMasterRegWrite in NutOs 4.8.9

[Ulrich Prinz]

Hi!

>  The devnau_m3n branch calls the function NutTwiMasterRegRead()
> 
> More confusion...

As I said: STM32 is emulating this extra comfort even his I2C IP cannot
handle register setup before transaction.

I think ybout adding these extr drivers for AVR too as it is the only
one that misses it completely.

Another thing:
You might have bee confused by the fact, that these functions are named
NutTwiXyz() while the original functions are TwiXyz().

All Nut/OS driver should start with 'Nut' I thought and to keep
compatibility with the example code I added some #defines that match
from TwiXyz to NutTwi for ARM and Cortex.

I would suggest to let the Tw function stack die some day and just use
NutTw...

Best regards
Ulrich