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

[Marcus Müller]

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)
u.clear_command_time()
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))
time.sleep(2)
print("get_center_freq after sleep: {:f} MHz".format(u.get_center_freq()/1e6))

Greetings,
Marcus

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> >

800000000.0

[... 2 second pause is here ...]

800000000.0

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?

-Doug

_______________________________________________
Discuss-gnuradio mailing list
address@hidden
https://lists.gnu.org/mailman/listinfo/discuss-gnuradio