AVR-Chat

> AVR311 and AVR315 have pretty good descriptions of how TWI works.

Right.. What I'm wrestling with at the moment, is what the SONAR wants though.

I discovered one interesting thing today though..
You can START a ping using the broadcast address, but you CANNOT read
the data using the broadcast address.. !@#!@$!%   This makes sense IF
there are multiple devices on the bus, but in the limited testing case
where only one device is present, it left me chasing ghosts for a
while...  The acroname support people did not spot that error either.

> I used a variation of SMBus for a multi-drop project with ARM9 CPU, keypad,
> IMU and servo board - each with m128 processors.  Works pretty well.  My big
> hint: Keep your transactions stateless so the occasional corrupt packet
> doesn't mess things up (i.e. don't depend upon the results of a previous
> command like auto-incrementing a pointer.

Hmm.. I'm not sure I understand.
If I address the device, and do a ripple-read of all the registers,
isn't that really the same as addressing the device multiple times and
reading only one register each time?  Or am I misunderstanding?