[Gta04-owner] gps and compass

Rico Rommel rico at bierrommel.de
Sat Nov 3 15:33:41 CET 2012

Am Samstag, 3. November 2012, 08:40:34 schrieb Benjamin Deering:
> On 11/03/2012 06:21 AM, Rico Rommel wrote:
> > Hi,
> > 
> > I recently got my gta04 and have some trouble with gps and hmc5883.
> > 
> > kernel is v3.5, gpsd is v3.6
> > 
> > gpsd in sirf mode doesn' get a fix.
> > If i stop gpsd and run gpsmon /dev/ttyO1 it uses nmea mode and gets a fix
> > after a few seconds. After that gpsd gets a fix in sirf mode too. It
> > works until battery is removed. After removing battery I have to run
> > gpsmon again to make it work.
> > 
> > And second, how the hmc5883 sensor can be used?
> > Values, read for examle from
> > /sys/bus/iio/devices/iio:device1/in_magn_y_raw, do not change, if the
> > device is moved.
> I found that I could not use the compass when the gta04 board is
> installed in a case with speakers, but it worked well outside of the
> case.  There seem to be some other sysfs files for the compass that
> could possibly apply a bias to counteract the speakers.  When I wrote
> anything to those files, I got a kernel error.  It could be an issue in
> the module.

that's sounds bad.

news about gps: After disabling the the sirf driver in gpsd it seems to work.

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