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
>
>
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