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Author SHA1 Message Date
Thomas Kolb 5f8346d290 agc: update squelch threshold more often 
This fixes the noise level tracking in test cases like the loopback
test where the signal has already ramped up before the first noise level
update.
 2024-05-25 18:16:24 +02:00
Thomas Kolb ca241f266b rx: add monotonic sample counter for debug messages 2024-05-25 18:15:23 +02:00
Simon Ruderich 0237ea6494 tests: fix compile 2024-05-09 18:32:51 +02:00
Simon Ruderich a4e55f781b Always NUL-terminate path in jsonlogger_init() 2024-05-09 18:32:26 +02:00
Simon Ruderich f689c4ec15 Fix compiler warnings 
- implicit declaration of built-in function 'strncpy'
- control reaches end of non-void function
- assignment to 'void (*)(int,  siginfo_t *, void *)' from incompatible pointer type 'void (*)(int)'
 2024-05-09 14:37:39 +02:00
Thomas Kolb a42d795002 Dump debug info from the RX via jsonlogger 2024-05-07 21:40:29 +02:00
Thomas Kolb 5bcd3a6933 jsonlogger: add test file and improve open/close behaviour 2024-05-05 18:40:50 +02:00
Thomas Kolb 251aca7738 Basic implementation of a JSON logger module 2024-05-05 18:09:00 +02:00
Thomas Kolb 033c26bcae preamble: invert symbols to match BPSK convention 2024-04-27 22:42:32 +02:00
Thomas Kolb c6ea578808 sdr: fix loss of samples due to unaligned buffer reads 
sdr_rf_to_baseband() processes samples in blocks of size SDR_OVERSAMPLING. If
the total number of samples does not align with this block size, the leftover
samples are lost and phase and timing glitches result.

To mitigate this, sdr_receive() now has an additional parameter that specifies
the alignment of the returned data. The number of samples returned is always a
multiple of this alignment factor. This feature is used to ensure that the
number of returned samples is a multiple of SDR_OVERSAMPLING and therefore no
samples are lost in sdr_rf_to_baseband().

sdr_rf_to_baseband() now has an additional check that makes the function fail
if the alignment is incorrect.
 2024-04-27 20:08:04 +02:00
Simon Ruderich a3928d0ad0 Fix compiler warnings 
- passing argument 2 of 'crc_generate_key' discards ‘const’ qualifier;
  a bit ugly but signature of crc_generate_key() is wrong
- variable 'linearized_history' set but not used
- typedef is unused
- superfluous arguments to DEBUG_LOG() and fprintf()
- implicit declaration of function 'memset'
- unused arguments
 2024-04-27 12:22:33 +02:00
Simon Ruderich b3ceb50b23 Fix one-byte buffer-overflow in layer1_rx_process() 2024-04-27 12:17:58 +02:00
Thomas Kolb c250944d79 transmission: fix ramp-down length calculation 2024-04-26 22:40:41 +02:00
Thomas Kolb e22b9ed4c5 rx: fix squelch level tracking 
Thanks to rudi_s for reporting this.
 2024-04-26 21:50:07 +02:00
Thomas Kolb d3b0ac1e0a rx: signal busy as long as squelch is open 2024-04-26 21:47:41 +02:00
Thomas Kolb 90ed7dc0a8 Re-add accidentally removed constants 2024-04-20 01:31:21 +02:00
Simon Ruderich 2768e21849 test_rx_file: set nco frequency 2024-04-20 01:14:17 +02:00
Simon Ruderich 79fc1c4f59 utils: fix numpy deprecation warnings 2024-04-20 01:14:17 +02:00
Thomas Kolb 7d1a927425 Calculate HackRF center frequency correctly 2024-04-20 01:07:21 +02:00
Thomas Kolb 32632914df Prevent TX exception in QPSK mode 
QPSK-modulated packets require more samples, which must be available in the TX
buffer. Therefore we increase the required free space.
 2024-04-20 01:04:13 +02:00
Thomas Kolb 11f19c03a0 Fix TX handling for multiple packets 
- (only) time-based end-of-transmission tracking
  - removed tx_done flag
  - count zero-buffers correctly in time-tracking
  - add 10 ms of headroom so the transmission does not stop before buffer was
    completely transmitted (race condition)
  - fix race condition with tx_start_time in sdr_start_tx()
- simplified packet queuing (no chunking)
- read multiple packets before starting transmission (to fill buffers initially)

Thanks to rudi_s!
 2024-04-20 00:55:39 +02:00
Thomas Kolb 1f5f922cdf Adjust squelch level and rampup 2024-04-12 21:50:49 +02:00
Thomas Kolb 91db4e1f75 rx: implement squelch + symsync reset 
Whenever the squelch opens, the symsync is reset to prevent lock-up in
that module due to noise.
 2024-04-08 22:03:09 +02:00
Thomas Kolb 4b46d87edb Add missing variable declaration 2024-03-31 22:26:34 +02:00
Thomas Kolb 93fd8aebbc Lock TX to RX frequency for clients 
Central nodes (“base stations”) do no longer do coarse frequency estimation,
but do only use the preamble + PLL for fine offset tracking.
 2024-03-31 22:23:04 +02:00
Thomas Kolb 4f4128fbd3 test: fixed build errors 2024-03-31 18:01:00 +02:00
Thomas Kolb 8441b12fbd rx: delay frequency estimation until history was fully refreshed 2024-03-30 22:10:13 +01:00
Thomas Kolb 171a4a369c rx: fix header checksum verification 2024-03-30 22:07:08 +01:00
Thomas Kolb 79d7f74dfc rx: use different PLL BW for header and data 2024-03-30 22:06:13 +01:00
Thomas Kolb bbf7bcf2f0 test/freq_est: add channel simulation 2024-03-30 22:05:02 +01:00
Thomas Kolb 66c88bf889 Improvements to debug scripts 2024-03-30 22:04:26 +01:00
Thomas Kolb d9707ac4a9 test: add test_rx_file 2024-03-30 21:56:00 +01:00
Thomas Kolb dd5712eada Add options parsing module 2024-03-30 21:51:27 +01:00
Thomas Kolb 07555edfdf Add CRC8 to the header 
This should prevent wrong decodings of modcod and packet length, which may disrupt decoding of directly following packets.
 2024-01-07 00:02:26 +01:00
Thomas Kolb 16aa2ce92c correlator: improved phase estimation 
The phase is now calculated based on the preamble correlation directly instead
of the method of the frequency estimator.
 2024-01-06 23:54:41 +01:00
Thomas Kolb ef25ca2388 Enable Hamming 8/4 code for the header 2024-01-05 21:29:41 +01:00
Thomas Kolb 84c172abc7 Fixed iterative frequency refinement; count header errors 2024-01-05 21:28:38 +01:00
Thomas Kolb 3a4be428b5 sdr: stop reading packets if the TX buffer is too full 2024-01-05 14:13:11 +01:00
Thomas Kolb e807f0617b rx: skip zero-length packets 
If passed on, these cause a segmentation fault in the channel decoder. As
zero-length packets currently make no real sense in this protocol, they are
ignored now.
 2024-01-05 13:49:50 +01:00
Thomas Kolb a6f12d876b sdr: fixed RX sample data conversion 2024-01-05 13:48:41 +01:00
Thomas Kolb be5fa06950 Handle SIGTERM and SIGINT for graceful shutdown 2024-01-03 22:03:19 +01:00
Thomas Kolb ee63483b8f sdr: scale sample for HackRF API 2024-01-03 17:41:35 +01:00
Thomas Kolb ac087634dd sdr: ensure that all samples were transmitted before TX is stopped 
This is done by tracking the time that the transmitter must stay on based on
the number of samples to be transmitted and the sampling rate.
 2024-01-03 17:32:51 +01:00
Thomas Kolb 8689ed5b27 Use fsleep instead of nanosleep 2024-01-03 17:29:51 +01:00
Thomas Kolb fb9c26ccd5 make.sh: allow passing parameters to make 2024-01-03 17:29:05 +01:00
Thomas Kolb 5564f1751a Fixed TX gain setting 2024-01-03 17:04:47 +01:00
Thomas Kolb c9d53ed96e Ensure that buffer is full when transmission starts 2024-01-03 00:33:54 +01:00
Thomas Kolb 628659511c sdr: properly flush the transmit buffers 2024-01-03 00:25:55 +01:00
Thomas Kolb 497498acd2 rx: fix overflow in symbol buffer 2024-01-03 00:01:27 +01:00
Thomas Kolb ef0fad4335 Improved handling of up- and downsampling 2024-01-02 23:49:55 +01:00