On Mon, 15 Feb 2010, Jason KG4WSV wrote: > My primary mission for the ATmega is to watch APRS messages for > payload command & control, so losing anything from the APRS side would > be a Bad Thing. I'd really like to have the GPS data, though, for > things like autonomous operations (e.g. altitude ceiling, lat/long > fences), logging max altitude, calculating new flight prediction, etc > etc.
Have a spare serial port on the Atmel? A 'Y' cable coming from the GPS is the best way to snoop. I suspect you're probably low on ports though as you'll only have one or two. Maybe an 8-pin Atmel or PIC to monitor the GPS line, then query it over SPI periodically? Of course if the software snoop mode works for this case, or can be tweaked to do so, forget what I just said. -- Curt, WE7U. <http://www.eskimo.com/~archer> APRS: Where it's at! <http://www.xastir.org> Lotto: A tax on people who are bad at math. - unknown Windows: Microsoft's tax on computer illiterates. - WE7U. The world DOES revolve around me: I picked the coordinate system!"
