RE: [Paparazzi-devel] modem question

[Roman Krashanitsa]

Hi Pascal,

Thanks for clearing that up. On my part I should admit that after we spoken
during the competition I still havent uploaded the protocol implementation
for Aerocomm, even though I used it during the competition :) . I havent
used cvs for already a year. Can you give me pointers what form will be
convenient and which directory it should go? Some integration into the
current version will be required.

Sincerely,
Roman Krashanitsa 

> -----Original Message-----
> From: 
> address@hidden 
> [mailto:address@hidden
> rg] On Behalf Of address@hidden
> Sent: Monday, June 09, 2008 1:10 PM
> To: address@hidden
> Subject: RE: [Paparazzi-devel] modem question
> 
> Hi,
> 
> implementation using the modem API, allowing to send adressed 
> packets, is currently done only for MaxStream modems (xTend 
> or Xbee). To my knowledge, this is not possible with 
> Aerocomms (it would require to change to a "command" mode 
> between each send).
> 
> If the autopilot is configured in transparent mode, a serial 
> cable will behave the same.
> 
> If the autopilot is configured in MaxStream mode (wrongly 
> historically named XBEE in the airframe file), it will work 
> with a serial cable in the same way ... thanks to a hack. It 
> should not work since the sender host is supposed to send a 
> TX16 packet to the sending modem while the receiving modem 
> sends a RX16 packet to the receiver host. When the pair of 
> modems is replaced by a serial cable, the receiver will get 
> an unexpected TX16 packet. However, both receivers, airborne 
> and ground, are hacked to take it into account:
> 
> sw/airborne/xbee.h:206
> sw/lib/ocaml/xbee.ml:172
> 
> --Pascal
> 
> 
> Quoting Yves Touchette <address@hidden>:
> 
> > Humm,
> >
> > I think that this statement is incorrect:
> >
> > > protocol. Using serial cable replacement mode you will 
> not be able 
> > > to transmit any data on to the airplane, only receive 
> telemetry from it.
> >
> > As far as I know you can still send command to the aircraft (move 
> > waypoints, tune some parameters, etc).
> >
> > Could someone confirm this?
> >
> > Regards,
> >
> > -yvest
> >
> > _________________________________________________________________
> >
> >
> 
> 
> 
> 
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