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Re: [Discuss-gnuradio] Confirming uhd.set_command_time is working

From: Anderson, Douglas J.
Subject: Re: [Discuss-gnuradio] Confirming uhd.set_command_time is working
Date: Wed, 29 Apr 2015 14:54:28 +0000


Sorry for the slow reply. It's a USRP N210. I'm running a pybombs build of UHD and GNURadio that's about a month old.


Using "actual_rf_freq" and "actual_dsp_freq", I get:

about to issue tune command...
-- Successfully tuned to 800.000000 MHz
immediate tune result: 800.000000MHz RF, 0.000000 Hz DSP
get_center_freq before sleep: 800.000000 MHz
get_center_freq after sleep: 800.000000 MHz


From: discuss-gnuradio-bounces+address@hidden [discuss-gnuradio-bounces+address@hidden on behalf of Marcus Müller address@hidden
Sent: Tuesday, April 28, 2015 1:38 AM
To: address@hidden
Subject: Re: [Discuss-gnuradio] Confirming uhd.set_command_time is working

Hi Doug,

I'm not 100%, but: Getting the center frequency might be a command which will also end up in the timed command queue.
What happens if you:

u.set_command_time(u.get_time_now() + uhd.time_spec(2))
print("about to issue tune command...")
result = u.set_center_freq(800e6)
print("immediate tune result: {:f}MHz RF, {:f} Hz DSP".format(result.rf_freq/1e6, result.dsp_freq))
print("get_center_freq before sleep: {:f} MHz".format(u.get_center_freq()/1e6))
print("get_center_freq after sleep: {:f} MHz".format(u.get_center_freq()/1e6))


On 04/28/2015 12:03 AM, Anderson, Douglas J. wrote:
Hi all,

I'm playing around with timed commands on the USRP, but I'm not sure I understand them correctly.

I've got a usrp connected as "u" and set to center freq 700e6.

>>> u.set_command_time(u.get_time_now() + uhd.time_spec(2)); u.set_center_freq(800e6); u.clear_command_time(); print(u.get_center_freq()); time.sleep(2); print(u.get_center_freq())
-- Successfully tuned to 800.000000 MHz
<gnuradio.uhd.uhd_swig.tune_result_t; proxy of <Swig Object of type '::uhd::tune_result_t *' at 0x7f1b75a3b930> >
[... 2 second pause is here ...]

It looks like it's changing the freq immediately... but I'm assuming as usual there's more than meets the eye to this command. Any hints?


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