Re: [gpsd-dev] Scaled AIS JSON messages...

[Christian Gagneraud]

On 22/08/12 10:21, Christian Gagneraud wrote:
> On 22/08/12 09:13, address@hidden wrote:
> > Hello,
>
> Hi Reinhard,
>
> > as much as i understand, the course in the gpsd ais type 1 message is
> > scaled by ten, but the heading is not.
>
> Correct.
>
> > During test with the nmea2000 ais decoder, i see no difference for
> > the course value, it is scaled by ten regardless if scaled is true a
> > false.
>
> You are right, in scaled mode the course is not scaled. This is a
> mistake in gpsd_json.c.
>
> > Should i insert the course value also only as a number between 0 and
> > 359?
>
> No, you should fill the structure with the raw course value (scaled by
> ten).

I just had a quick look at your code in driver_nmea.c, and I noticed 
that you're filling the AIS structure with double values. This is wrong 
you should fill the structure with raw (unscaled, integer) values.
If you need help, let me know, i'll be happy to contribute.

Chris

> Chris
>
> > Thank you
> >
> > Reinhard


--
Christian Gagneraud,
Embedded systems engineer.
Techworks Marine
1 Harbour road
Dun Laoghaire
Co. Dublin
Ireland
Tel: + 353 (0) 1 236 5990
Web: http://www.techworks.ie/