Hi Luca,

thanks for the review!

> good, but I think there's a problem in this function. A "normal"
> master_xfer function issues a repeated start between one msg and the
> next one, at least in the typical case where all msgs have the same
> slave address. Your implementation breaks repeated start. At first sight
> we might need more complex code here to coalesce all consecutive msgs
> with the same address into a single i2c_transfer() call.

Note that it is by far the standard case that all messages in a transfer
have the same client address (99,999%?). But technically, this is not a
requirement and the repeated start on the bus is totally independent of
the addresses used. It is just a master wanting to send without being
interrupted by another master.

   Wolfram