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[Discuss-gnuradio] GPS query get_mboard_sensors("gps_locked") fails some

From: Bastien Auneau
Subject: [Discuss-gnuradio] GPS query get_mboard_sensors("gps_locked") fails sometimes
Date: Tue, 02 Aug 2011 17:08:39 +0000
User-agent: Mozilla/5.0 (Windows NT 5.1; rv:5.0) Gecko/20110624 Thunderbird/5.0

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
using get_mboard_sensors("gps_locked") fails sometimes

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

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