Hi mleech, thanks for your help.
I have done the post-installation task by using the command :sudo
./usrp_burn_mb_eeprom --args=addr=192.168.10.2 --key=gpsdo --val=internal
The terminal return:
Creating USRP device from address: addr=192.168.10.2
-- Opening a USRP2/N-Series device...
-- Current recv frame size: 1472 bytes
-- Current send frame size: 1472 bytes
Fetching current settings from EEPROM...
EEPROM ["gpsdo"] is "internal"
Setting EEPROM ["gpsdo"] to "internal"...
Power-cycle the USRP device for the changes to take effect.
I think the congfiure is successful. Then I use the GPS function of my phone,
It works. I think the signal of GPS satellite is also available.
But the lookuperror still exists. Why was that? Dose gpsdo can't be used in
China?
By FengZhu
________________________________
发件人： "[email protected]" <[email protected]>
收件人： [email protected]
发送日期： 2012年3月21日, 星期三, 下午 10:16
主题: Re: [Discuss-gnuradio] unexpected LookupError using gpsdo
On Wed, 21 Mar 2012 21:23:39 +0800 (CST), Fengzhu FengzhuYe wrote:
Hi,
>I have bought two gpsdos and install them to my usrp n210. Then I congfiured
>them step by step according to the following link provided by ettus LLC
>http://files.ettus.com/uhd_docs/manual/html/gpsdo.html.
>After all the things had done, I tried to retrieve the current GPS time by the
>"gps_time" sensor using the codes : " usrp->get_mboard_sensor("gps_time") ".
>The
>compilation is ok and I executived the program. Then an unexpected LookupError
>occured :
>
>
>Error: LookupError: Path not found in tree: /mboards/0/sensors/gps_time
>
>
>I printed all sensor list and there are only two sensor "mimo_locked",
>"ref_locked". So I thought that means The gpsdo was not properly set so that
>the usrp didn't find any "gps_time" sensors. But when I executived the program
>"test_pps_input" at /usr/local/share/uhd/example. The pps seens all right.
>That means the gpsdo is ok. What's more, when I used the reference sources
>provided by an external GPSDO by the code :
>usrp->set_clock_source("external");
>usrp->set_time_source("external");
>It work well too.
>Now I am confused . why is that happen? Was my gpsdo broken? All the two
>gpsdos have the same LookupError.
>
>Thanks for your help.
>
Did you do the post-installation task:
http://files.ettus.com/uhd_docs/manual/html/gpsdo.html#post-installation-task-n-series-only
Also, the "gps_time" is only available once the GPSDO is locked to a GPS
satellite constellation--that's where it gets the time from (and the phase
reference!).
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