On 2021-11-22 03:23, Emanuele Tolomei wrote:
Sorry, here is the attached snippet.
Emanuele Tolomei
----- Messaggio originale -----
Da: "Emanuele Tolomei" <[email protected]>
A: "usrp-users" <[email protected]>
Cc: "Luigi Venuso" <[email protected]>, "gianluca.bafanelli"
<[email protected]>
Inviato: Lunedì, 22 novembre 2021 9:21:45
Oggetto: Trouble with TwinRX frequency tuning
Hello,
I have an X300 with two TwinRX daughterboards, and I'm using UHD 3.13.1. I need
channels synchronization for DOA calculation, so the channels share the same LO
provided by channel 0.
The code for the LO sharing is the following:
m_MultiUsrp->set_time_unknown_pps(uhd::time_spec_t());
std::this_thread::sleep_for(std::chrono::seconds(1)); // wait for pps sync pulse
// Set channel specific settings
m_MultiUsrp->set_rx_lo_export_enabled(true, m_MultiUsrp->ALL_LOS, 0);
m_MultiUsrp->set_rx_lo_source("internal", m_MultiUsrp->ALL_LOS, 0);
m_MultiUsrp->set_rx_dc_offset(true, 0);
m_MultiUsrp->set_rx_lo_source("companion", m_MultiUsrp->ALL_LOS, 1);
m_MultiUsrp->set_rx_dc_offset(true, 1);
m_MultiUsrp->set_rx_lo_source("external", m_MultiUsrp->ALL_LOS, 2);
m_MultiUsrp->set_rx_dc_offset(true, 2);
m_MultiUsrp->set_rx_lo_source("external", m_MultiUsrp->ALL_LOS, 3);
m_MultiUsrp->set_rx_dc_offset(true, 3);
I am able to correctly tune the channels for the first time. However I'm having
problems with changing the center frequency at runtime. When using the command
set_rx_frequency() both in channel tuning and in channel synchronization, after
a few loops the application crashes producing the error:
what(): EnvironmentError: IOError: Block ctrl (CE_01_Port_40) no response
packet - AssertionError: bool(buff)
in uint64_t ctrl_iface_impl<_endianness>::wait_for_ack(bool, double) [with
uhd::endianness_t _endianness = (uhd::endianness_t)0u; uint64_t = long unsigned int]
at /home/emanuele/uhd/host/lib/rfnoc/ctrl_iface.cpp:154
In particular, in the attached code of the ReceiveSamplesBurst function, if I comment
between lines tagged with "INDICTED CODE LINES", the application runs without
problems but the channels are not phase-synchronized.
How can I avoid this error while keeping the synchronization between all the
four channels?
Thank you in advance.
Emanuele Tolomei
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Two questions:
Have you tried changing the command-time to be slightly further into the
future than 10 milliseconds?
Can you try a a newer version of UHD?
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