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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