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Today's Topics:
1. Re: Regarding 10Mhz External Clock for USRP2 (Josh Blum)
2. Basic grc application for the USRP N210 (Nishin Vasu)
----------------------------------------------------------------------
Message: 1
Date: Sat, 19 Mar 2011 10:35:50 -0700
From: Josh Blum <[email protected]>
To: [email protected]
Subject: Re: [USRP-users] Regarding 10Mhz External Clock for USRP2
Message-ID: <[email protected]>
Content-Type: text/plain; charset=ISO-8859-1
On 03/19/2011 04:38 AM, abhinav anand wrote:
> Hi Group,
>
> I am in a need of using a function generator to provide 10Mhz reference
> clock to USRP2. I am using *standalone UHD*
> with USRP2, and not the Gnuradio-UHD.
>
> I want to know how to *enable locking* in USRP2 to use 10Mhz external clock
> instead of 100Mhz internal one.
> Is there any python script to be executed or any firmware change in UHD
> required for the same ??
>
> Please suggest me a way to do it.
>
See
http://www.ettus.com/uhd_docs/doxygen/html/classuhd_1_1usrp_1_1multi__usrp.html#aceddf575752fda1a8cc75513a1178fd9
http://www.ettus.com/uhd_docs/doxygen/html/structuhd_1_1clock__config__t.html
-Josh
------------------------------
Message: 2
Date: Sun, 20 Mar 2011 09:52:45 +0800
From: Nishin Vasu <[email protected]>
To: [email protected]
Subject: [USRP-users] Basic grc application for the USRP N210
Message-ID:
<[email protected]>
Content-Type: text/plain; charset="iso-8859-1"
Hello,
I have recently started to work on the USRP N210. I have managed to install the
GNU radio and uhd successfully on my system. The firmware and the FPGA
image have been loaded successfully (as indicated by the leds). The
device also pings successfully and also able to obtain outputs for
uhd_find_devices and uhd_usrp_probe.
Initially I tried using the usrp2_fft.py but was unsuccessful. Thus
later understood from the forum that the UHD does not support the python
scripts and that we have to use the GRC.
Now I tried a basic connection in a GRC, namely from a UHD USRP source
to a FFT sink but I got an error mentioning
*"
Warning:
error in pthread_setschedparam
Failed to set thread priority 0.5 (realtime):
Performance may be negatively affected.
See the general application notes
UHD source block got error code 0x1
output. We're marking it DONE
*
*gr_block_executor: source <gr_block gr uhd usrp source (1)> produced no**"*
Am I going wrong somewhere....
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nishin@ubuntu:~$ uhd_find_devices
linux; GNU C++ version 4.4.3; Boost_104000; UHD_003.20110228205954.bec619c
--------------------------------------------------
-- UHD Device 0
--------------------------------------------------
Device Address:
type: usrp2
addr: 192.168.10.2
name:
serial: EDR10Y8UP
nishin@ubuntu:~$ uhd_usrp_probe
linux; GNU C++ version 4.4.3; Boost_104000; UHD_003.20110228205954.bec619c
Current recv sock buff size: 50000000 bytes
mboard0 MIMO master
Warning:
error in pthread_setschedparam
Failed to set thread priority 0.5 (realtime):
Performance may be negatively affected.
See the general application notes.
_____________________________________________________
/
| Device: USRP2/N Series device
| _____________________________________________________
| /
| | Mboard: USRP-N210 mboard
| | rev: 2561
| | mac-addr: a0:36:fa:25:30:d8
| | ip-addr: 192.168.10.2
| | serial: EDR10Y8UP
| | _____________________________________________________
| | /
| | | RX DSP: USRP-N210 ddc0
| | | Codec Rate: 100.000000 Msps
| | _____________________________________________________
| | /
| | | TX DSP: USRP-N210 duc0
| | | Codec Rate: 100.000000 Msps
| | _____________________________________________________
| | /
| | | RX Dboard: USRP-N210 dboard (rx unit)
| | | _____________________________________________________
| | | /
| | | | RX Subdev: WBX (0x0053)
| | | | Antennas: TX/RX, RX2
| | | | Freq range: 68.750 to 2200.000 Mhz
| | | | Gain range PGA0: 0.0 to 31.5 step 0.5 dB
| | | | Connection Type: C
| | | | Uses LO offset: No
| | | _____________________________________________________
| | | /
| | | | RX Codec: USRP-N210 adc - ads62p44
| | | | Gain range digital: 0.0 to 6.0 step 0.5 dB
| | | | Gain range digital-fine: 0.0 to 0.5 step 0.1 dB
| | _____________________________________________________
| | /
| | | TX Dboard: USRP-N210 dboard (tx unit)
| | | _____________________________________________________
| | | /
| | | | TX Subdev: WBX (0x0052)
| | | | Antennas: TX/RX
| | | | Freq range: 68.750 to 2200.000 Mhz
| | | | Gain range PGA0: 0.0 to 25.0 step 0.1 dB
| | | | Connection Type: C
| | | | Uses LO offset: No
| | | _____________________________________________________
| | | /
| | | | TX Codec: USRP-N210 dac - ad9777
| | | | Gain Elements: None
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