Re: [Paparazzi-devel] NMEA GPS Support in Paparazzi Code-base

[Roman Krashanitsa]

I agree with Felix

NMEA sucks. Paparazzi uses fast, lightweight binary protocol that does not put additional strain on the autopilot processor (it needs that computational power). Also, ublox produces the best gps modules. Of course, they are not cheap.

2012/2/1 Jake Stewart <address@hidden>

I agree NMEA sucks, but it seems that it is the standard.  Every GPS I've seen uses it.

A NMEA parser should be a priority, and shouldn't be too hard to implement.  NMEA seems pretty standardized, so most of the traffic can be ignored I would think.

I'm still trying to learn the ins and outs of the PPZ design, but I did finally get it installed.  The new windows Ubuntu installer works pretty slick.  It sets you up with a dual boot setup and uses a file on your NTFS drive for the linux filesystem, a virtual disk I guess.  Anyways, it works with almost no user interaction or knowledge.  The existing PPZ wiki install documentation works just fine, but I'll update it with some more clear instructions.  The whole thing does take quite awhile though.

-Jake


> ----- Original Message -----

> From: Felix Ruess
> Sent: 02/01/12 11:02 AM
> To: address@hidden
> Subject: Re: [Paparazzi-devel] NMEA GPS Support in Paparazzi Code-base
>
> Hi Jake,
>
> short answer: NMEA sucks (at least imho).
> Also the ublox GPS are quite nice and parsing a binary protocol is
> always more efficient than parsing NMEA strings...
> You can also configure the ublox GPS via the binary protocol at
> startup from the ap.
>
> Not sure what you mean by basic GPS interface. The interface is the
> same for all GPS drivers... ublox is just the most commonly used one..
>
> That being said, of course it would be nice to have a properly tested
> and complete NMEA driver...
>
> Cheers, Felix
>
> On Wed, Feb 1, 2012 at 7:53 PM, Jake Stewart <address@hidden> wrote:
> > Chris, you might want to check out the Fastrax UP501 GPS module.  It uses the same mediatek chipset and has better specs for everything I checked.  It's also $28 (Mouser) instead of $60 (SparkFun).  I couldn't find any normal electronics distributors carrying the LS20031, so that is maybe a red flag in some ways.
> >
> > I've got a UP501 and it seems to work well (limited testing only).  I'll be working on getting that running also, so we could share efforts.  I was really surprised to see that PPZ doesn't normally support standard GPS.  Anyone know why an oddball protocol was chosen as the basic GPS interface?
> >
> >
> > -Jake
> >
> >
> >> ----- Original Message -----
> >> From: Chris Wozny
> >> Sent: 02/01/12 08:44 AM
> >> To: address@hidden
> >> Subject: [Paparazzi-devel] NMEA GPS Support in Paparazzi Code-base
> >>
> >> All,
> >>
> >> After having searched through the mailing list, it looks like some
> >> work was done on adding an NMEA parser to the guidance code. I was
> >> wondering the status of this since I emailed the original inquirer and
> >> he told me that he never followed up on his attempt to try it. I'm
> >> looking to use the LS20031 GPS receiver (from Sparkfun) with the
> >> Lisa/M autopilot. It operates at 57600 bps with a TTL serial interface
> >> just in case anyone is wondering. Has anyone used the NMEA parser in
> >> flight yet?
> >>
> >> Best,
> >> Chris
> >>
> >> _______________________________________________
> >> Paparazzi-devel mailing list
> >> address@hidden
> >> https://lists.nongnu.org/mailman/listinfo/paparazzi-devel
> >
> >
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