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List:       usrp-users
Subject:    Re: [USRP-users] Config USRP Source/Sink integer-N mode and timed commans via messages
From:       Lukas Haase via USRP-users <usrp-users () lists ! ettus ! com>
Date:       2019-12-18 16:53:26
Message-ID: trinity-8bb4682d-afc9-48fa-89d1-73cb93c2545c-1576688006803 () 3c-app-gmx-bap35
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Hi,

I just wanted to follow up on the question below.
I am currently (ab)using the "Function Probe" to execute the tuning code at the "Poll \
Rate". But I'd like to avoid this because it does not seem reliable.

My main concerns are (a) setting integer-N mode via the messages port and (b) \
obtaining the current USRP time (get_time_now) for the timed commands when using the \
message port.

If this is something that's just not possible, that would be a valuable answer as \
well.


Thanks,
Luke



> Gesendet: Freitag, 13. Dezember 2019 um 22:50 Uhr
> Von: "Lukas Haase" <lukashaase@gmx.at>
> An: usrp-users@lists.ettus.com
> Betreff: Config USRP Source/Sink integer-N mode and timed commans via messages
> 
> Hi,
> 
> The UHD interface supports messages to change center frequency etc [1].
> I would want to send the following commands via messages to the USRP Sink and USRP \
> Source, respectively: 
> now = self.uhd_usrp_sink_0.get_time_now()
> timeStamp = now + uhd.time_spec(0.1)
> 
> tune_req_tx = uhd.tune_request(fcenter-1e6, 1e6)
> tune_req_tx.args=uhd.device_addr(','.join(["mode_n=integer", \
> "int_n_step=1000e3",])) self.uhd_usrp_sink_0.set_command_time(timeStamp)
> res1 = self.uhd_usrp_sink_0.set_center_freq(  tune_req_tx, 0)
> self.uhd_usrp_sink_0.clear_command_time()
> 
> tune_req_rx = uhd.tune_request(2*fcenter)
> tune_req_rx.args=uhd.device_addr(','.join(["mode_n=integer", \
> "int_n_step=1000e3",])) now = self.uhd_usrp_sink_0.get_time_now()
> self.uhd_usrp_source_0.set_command_time(timeStamp)
> res2 = self.uhd_usrp_source_0.set_center_freq(tune_req_rx, 0)
> self.uhd_usrp_source_0.clear_command_time()
> 
> The first issue is that the "tune_request" described in [1] is a simple pair. \
> However, the real uhd::tune_request_t is more comprehensive and includes the "args" \
> element that I need to set to "mode_n=integer", "int_n_step=1000e3" for integer N \
> PLL. 
> The second issue is the timed command. It seems usrp_block::set_command_time \
> translates into "time" with "timestamp" and usrp_block::clear_command_time \
> translates into "time" with PMT_NIL. However, how to I obtain the current UHD time \
> (uhd_usrp_sink_0.get_time_now)? 
> Thanks,
> Luke
> 
> 
> [1] https://www.gnuradio.org/doc/doxygen/page_uhd.html




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