hackrf_sweep hangs being run in cycle

[egm108]

What type of issue is this?

permanent - occurring repeatedly

What issue are you facing?

I need sweep in cycle (to sweep different frequencies) Both variants: a) while true; do hackrf_sweep -1 -f 2400:2500; done > out 2>&1 b) c code when I do hackrf_start_rx_sweep and hackrf_stop_rx

lead to no sweeping.

for (a)

call hackrf_sample_rate_set(20.000 MHz)
call hackrf_baseband_filter_bandwidth_set(15.000 MHz)
Sweeping from 2400 MHz to 2500 MHz
Stop with Ctrl-C
2024-02-12, 18:52:45.438607, 2400000000, 2405000000, 1000000.00, 20, -70.99, -61.34, -63.00, -63.37, -67.39
2024-02-12, 18:52:45.438607, 2410000000, 2415000000, 1000000.00, 20, -68.79, -61.94, -67.48, -56.33, -55.68
2024-02-12, 18:52:45.438607, 2405000000, 2410000000, 1000000.00, 20, -64.41, -63.51, -56.14, -63.15, -65.91
2024-02-12, 18:52:45.438607, 2415000000, 2420000000, 1000000.00, 20, -59.28, -61.79, -65.36, -72.95, -74.91
2024-02-12, 18:52:45.438607, 2420000000, 2425000000, 1000000.00, 20, -51.90, -49.43, -50.72, -59.27, -67.18
2024-02-12, 18:52:45.438607, 2430000000, 2435000000, 1000000.00, 20, -62.72, -64.52, -56.73, -50.79, -51.09
2024-02-12, 18:52:45.438607, 2425000000, 2430000000, 1000000.00, 20, -53.96, -55.98, -60.97, -59.57, -61.22
2024-02-12, 18:52:45.438607, 2435000000, 2440000000, 1000000.00, 20, -52.17, -53.34, -58.50, -60.74, -60.55
2024-02-12, 18:52:45.438607, 2440000000, 2445000000, 1000000.00, 20, -53.61, -56.22, -57.14, -56.08, -64.61
2024-02-12, 18:52:45.438607, 2450000000, 2455000000, 1000000.00, 20, -49.45, -55.27, -56.98, -55.46, -57.99
2024-02-12, 18:52:45.438607, 2445000000, 2450000000, 1000000.00, 20, -56.54, -73.85, -57.36, -55.30, -55.26
2024-02-12, 18:52:45.438607, 2455000000, 2460000000, 1000000.00, 20, -55.96, -61.23, -57.68, -55.75, -56.46
2024-02-12, 18:52:45.438607, 2460000000, 2465000000, 1000000.00, 20, -53.99, -56.38, -63.27, -60.91, -58.08
2024-02-12, 18:52:45.438607, 2470000000, 2475000000, 1000000.00, 20, -55.83, -55.09, -57.14, -57.72, -56.21
2024-02-12, 18:52:45.438607, 2465000000, 2470000000, 1000000.00, 20, -59.86, -59.66, -61.24, -56.41, -59.90
2024-02-12, 18:52:45.438607, 2475000000, 2480000000, 1000000.00, 20, -53.29, -58.89, -61.77, -58.44, -59.30
2024-02-12, 18:52:45.438607, 2480000000, 2485000000, 1000000.00, 20, -55.99, -54.57, -57.51, -68.44, -54.82
2024-02-12, 18:52:45.438607, 2490000000, 2495000000, 1000000.00, 20, -69.77, -53.48, -54.35, -64.10, -62.91
2024-02-12, 18:52:45.438607, 2485000000, 2490000000, 1000000.00, 20, -62.91, -59.65, -55.76, -57.72, -61.56
2024-02-12, 18:52:45.438607, 2495000000, 2500000000, 1000000.00, 20, -64.32, -59.21, -56.78, -53.10, -50.91

Exiting...
Total sweeps: 1 in 0.05023 seconds (19.91 sweeps/second)
hackrf_close() done
hackrf_exit() done
exit
call hackrf_sample_rate_set(20.000 MHz)
call hackrf_baseband_filter_bandwidth_set(15.000 MHz)
Sweeping from 2400 MHz to 2500 MHz
Stop with Ctrl-C
0 total sweeps completed, 0.00 sweeps/second
0 total sweeps completed, 0.00 sweeps/second
0 total sweeps completed, 0.00 sweeps/second
.....

I debugged this a little bit. It happens that we cannot extract frequency in rx_callback, so the callback is called, but some trash is going inside buffer. if (ubuf[0] == 0x7F && ubuf[1] == 0x7F) { I mean a condition is wrong, so we cannot extract frequency.

What are the steps to reproduce this?

while true; do hackrf_sweep -1 -f 2400:2500; done > out 2>&1

My software see below. You guys had some similar problems here... But: I see in my hackrf version (from github) I have all these fixes (checked not just date but lines from commits).... That's why I create a new one.

Can you provide any logs? (output, errors, etc.)

egm@raspberrypi:~/ext_lib/hackrf/hackrf/host/build $ hackrf_info
hackrf_info version: git-4b31fd91*
libhackrf version: git-4b31fd91* (0.8)
Found HackRF
Index: 0
Serial number: 0000000000000000f75461dc2c9092c3
Board ID Number: 4 (HackRF One)
Firmware Version: 2023.01.1 (API:1.07)
Part ID Number: 0xa000cb3c 0x00614758
Hardware Revision: r9
Hardware does not appear to have been manufactured by Great Scott Gadgets.
Hardware supported by installed firmware:
    HackRF One
egm@raspberrypi:~/ext_lib/hackrf/hackrf/host/build $ ^C
egm@raspberrypi:~/ext_lib/hackrf/hackrf/host/build $ uname -a
Linux raspberrypi 6.1.21-v7+ #1642 SMP Mon Apr  3 17:20:52 BST 2023 armv7l GNU/Linux
egm@raspberrypi:~/ext_lib/hackrf/hackrf/host/build $

[egm108]

latest libusb, latest hackrf from github..

[martinling]

Thanks for the report. As you note, this does look similar to some past issues, but you're running the latest code so there must still be something else going wrong.