Re: [Discuss-gnuradio] GPS query get_mboard_sensors("gps_locked") fails sometimes

[Nick Foster]

OK. My guess is the timeout requirement for communicating with the
Firefly has changed with new firmware, and I'm not waiting long enough
between commands. I'll poke at it today.

--n

On Wed, 2011-08-03 at 15:44 +0200, Bastien Auneau wrote:
> Some more details
> _ when Jackon Labs GPS detected as Generic NMEA GPS device, no need to
> power cycle USRP to get back to normal. It just happen randomly to be
> 3 times in a row when I tested it, but it's as random as other problem
> with gps_time and gps_locked
> _ when some problem occurs (GPS device detection, error when query
> gps_time or gps_locked), it is very often that few query in a row, or
> close to each others have such error
> 
> 
> The common point I see from these calls is that data is fetched from
> GPSDO serial. So there must be some problem with serial connection ?
> Or with string manipulation coming out of serial ? Or maybe the way
> it's sent to UHD-host ?
> 
> 
> We have many USRP in our lab, but only one GPSDO. Nick, do you
> have opportunities to try these sensor calls on some other devices ?
> Then we'll see if it is related to our HW or the way GPSDO has been
> installed (I followed strictly the procedure on the wiki, as far as I
> know...) ? Or if it is SW problem
> 
> 
> Regards
> Bastien
> 
> On 2 August 2011 17:44, Nick Foster <address@hidden> wrote:
>         Bastien,
>         
>         Does gps_time work correctly 100% of the time for you?
>         
>         --n
>         
>         
>         On Tue, 2011-08-02 at 17:08 +0000, Bastien Auneau wrote:
>         > Hi All
>         >
>         > On USRP N210, UHD 3.2.1
>         > GPS does lock, because it gets the right time (not the
>         01/01/2006 set at
>         > init)
>         > using get_mboard_sensors("gps_locked") fails sometimes
>         >
>         > 1.
>         > It may print on console :
>         >
>         > UHD Error:
>         >   get_nmea(): unsupported GPS or no GPS detected
>         >
>         > while at the start of the code, it always prints :
>         >
>         > Found a Jackson Labs GPS
>         >
>         > At this pont, I have to reboot the USRP. I have seen this
>         error twice on
>         > 20 to 25 runs
>         >
>         > 2. Or :
>         >
>         > UHD Error:
>         >   get_token: too few tokens in reply $GPGGA,  [etc... then
>         there are
>         > more or less args after that, randomly)
>         > GPS lock status: locked
>         >
>         > This second error occurs 1% of the time, but following
>         > get_mboard_sensors("gps_locked") succeed (no need to restart
>         USRP)
>         >
>         > 3. Which leads me to :
>         > How do you check if a get_mboard_sensors(...) fails or not ?
>         > Because even when it fails, the value returned seems ok. And
>         there is no
>         > error field.
>         > Or should this not happen ?
>         >
>         > Thanks and Regards
>         > Bastien
>         >
>         
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> 
>