Fwd: Protocol documentation updated

Apologies if this appears twice, but I sent it Monday evening when the
list stalled and it never arrived back, so I'm assuming it got 
dropped...

Pete.


Begin forwarded message:

> From: Pete Bentley <[email protected]>
> Date: Tue Jan 21, 2003  23:59:34 Europe/London
> To: netmd-dev <[email protected]>
> Subject: Re: Protocol documentation updated
>
> On Monday, Jan 20, 2003, at 11:54 Europe/London, Marcus Brinkmann 
> wrote:
>> I think there are a lot of subtleties, like the empty
>> receive before sending commands, etc, that we have simply ignored so 
>> far,
>> at the potential cost of portability to (future) netmd hardware.
>
> Empty receive?
>
> Do you mean the 4 byte control transfer that returns 00 00 00 00
> or 01 81 xx xx, or am I missing something else? I got the impression
> from my logs that this was done *after* sending each command rather
> than before, ie:-
>
> * Send NetMD command
> * Poll for reply, keep polling until we get 01 81 xx xx rather than
>   00 00 00 00.
> * Receive NetMD reply
> * Poll for reply, so far in all cases I have seen this is
>   always 00 00 00 00
>
> (this is what libomd does)
>
> Of course, I may have got out of sync reading the logs and the 'empty' 
> poll
> is before rather than after the command gets sent.
>
> Which kind of implies it's a mechanism for the NetMD unit to generate
> some type of asynchronous notifications...
>
> Pete.
>