On 06/03/2024 13:56, ygurupra...@umass.edu wrote:
Could some help me if this is working as expected?
./bin/txrx_loopback_to_file --tx-args addr=192.168.10.2 --rx-args
addr=192.168.10.2 --tx-rate 100e6 --rx-rate 6.5e6 --tx-freq 20e6
--rx-freq 18e6
Creating the transmit usrp device with: addr=192.168.10.2...
[INFO] [UHD] linux; GNU C++ version 8.5.0 20210514 (Red Hat 8.5.0-20);
Boost_106600; UHD_4.2.0.1-0-g321295fb
[INFO] [X300] X300 initialization sequence...
[INFO] [X300] Maximum frame size: 1472 bytes.
[INFO] [GPS] Found an internal GPSDO: LC_XO, Firmware Rev 1.101
[INFO] [X300] Radio 1x clock: 200 MHz
[INFO] [0/KeepOneInN#0] Setting default MTU forward policy.
Creating the receive usrp device with: addr=192.168.10.2...
Using TX Device: Single USRP:
Device: X-Series Device
Mboard 0: X310
RX Channel: 0
RX DSP: 0
RX Dboard: A
RX Subdev: BasicRX (0)
RX Channel: 1
RX DSP: 1
RX Dboard: A
RX Subdev: BasicRX (1)
RX Channel: 2
RX DSP: 2
RX Dboard: B
RX Subdev: Unknown (0xffff) - 0
TX Channel: 0
TX DSP: 0
TX Dboard: A
TX Subdev: BasicTX (0)
TX Channel: 1
TX DSP: 1
TX Dboard: B
TX Subdev: Unknown (0xffff) - 0
Using RX Device: Single USRP:
Device: X-Series Device
Mboard 0: X310
RX Channel: 0
RX DSP: 0
RX Dboard: A
RX Subdev: BasicRX (0)
RX Channel: 1
RX DSP: 1
RX Dboard: A
RX Subdev: BasicRX (1)
RX Channel: 2
RX DSP: 2
RX Dboard: B
RX Subdev: Unknown (0xffff) - 0
TX Channel: 0
TX DSP: 0
TX Dboard: A
TX Subdev: BasicTX (0)
TX Channel: 1
TX DSP: 1
TX Dboard: B
TX Subdev: Unknown (0xffff) - 0
Setting TX Rate: 100.000000 Msps...
Actual TX Rate: 100.000000 Msps...
Setting RX Rate: 6.500000 Msps...
[WARNING] [0/DDC#0] The requested decimation is odd; the user should
expect passband CIC rolloff.
Select an even decimation to ensure that a halfband filter is enabled.
Decimations factorable by 4 will enable 2 halfbands, those factorable
by 8 will enable 3 halfbands.
decimation = dsp_rate/samp_rate -> 31
[WARNING] [0/DDC#0] The requested decimation is odd; the user should
expect passband CIC rolloff.
Select an even decimation to ensure that a halfband filter is enabled.
Decimations factorable by 4 will enable 2 halfbands, those factorable
by 8 will enable 3 halfbands.
decimation = dsp_rate/samp_rate -> 31
[WARNING] [MULTI_USRP] Could not set RX rate to 6.500 MHz. Actual rate
is 6.452 MHz
[WARNING] [0/DDC#0] The requested decimation is odd; the user should
expect passband CIC rolloff.
Select an even decimation to ensure that a halfband filter is enabled.
Decimations factorable by 4 will enable 2 halfbands, those factorable
by 8 will enable 3 halfbands.
decimation = dsp_rate/samp_rate -> 31
[WARNING] [0/DDC#0] The requested decimation is odd; the user should
expect passband CIC rolloff.
Select an even decimation to ensure that a halfband filter is enabled.
Decimations factorable by 4 will enable 2 halfbands, those factorable
by 8 will enable 3 halfbands.
decimation = dsp_rate/samp_rate -> 31
[WARNING] [MULTI_USRP] Could not set RX rate to 6.500 MHz. Actual rate
is 6.452 MHz
[WARNING] [0/DDC#1] The requested decimation is odd; the user should
expect passband CIC rolloff.
Select an even decimation to ensure that a halfband filter is enabled.
Decimations factorable by 4 will enable 2 halfbands, those factorable
by 8 will enable 3 halfbands.
decimation = dsp_rate/samp_rate -> 31
[WARNING] [0/DDC#1] The requested decimation is odd; the user should
expect passband CIC rolloff.
Select an even decimation to ensure that a halfband filter is enabled.
Decimations factorable by 4 will enable 2 halfbands, those factorable
by 8 will enable 3 halfbands.
decimation = dsp_rate/samp_rate -> 31
[WARNING] [MULTI_USRP] Could not set RX rate to 6.500 MHz. Actual rate
is 6.452 MHz
Actual RX Rate: 6.451613 Msps...
Setting TX Freq: 20.000000 MHz...
Actual TX Freq: 20.000005 MHz...
Setting RX Freq: 18.000000 MHz...
Actual RX Freq: 17.999995 MHz...
[WARNING] [0/Radio#0] Attempting to set tick rate to 0. Skipping.
Press Ctrl + C to stop streaming...
Setting device timestamp to 0...
UUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUU^CUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUU
Done!
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I'll note that a sample-rate of 6.5e6 is NOT exactly possible with the
X310. The configured sample rates MUST be a proper fraction
of the master clock rate, which is 200e6 by default on the X310:
https://kb.ettus.com/X300/X310#Clocking_and_Sampling_Rates
So, UHD is rounding your commanded sample rate to the nearest possible
sample rate.
You're asking for a TX rate of 100e6, which, clearly, your host isn't
able to "keep up" with, since it's issuing large amounts of
"U" (under-run) which means your host, on average, is failing to
deliver samples to the radio at the commanded
sample rate.
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