* AM: add opt-in channel-power squelch for AM audio RX
Add an SDR++-style power squelch on the complex channel signal for the
Analog Audio RX app in AM modes (DSB/SSB/CW). The squelch measures the
mean channel power, converts it to dBFS, and mutes the demodulated audio
when the signal is below a user-set threshold. Being carrier-based it
keys on the AM carrier (e.g. airband/ATC) rather than on audio-band
noise, which the existing FM squelch could not do for AM.
A new 'SQ' field (0-99, 0 = off) is added to the AM options view and is
persisted per app via app_settings. Default is 0, so existing AM
behaviour is unchanged unless the user enables it. Threshold maps 1..99
to -80..-20 dBFS.
Touches: message (AMConfigureMessage.squelch_level), baseband_api
(AMConfig::apply), receiver_model (am_squelch_level get/set),
app_settings (persistence), proc_am_audio (DSP), analog_audio_app (UI).
* Refactor audio power calculation to use magnitude squared
Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>
---------
Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>
* fix clock init and add mayhem tx capacity
* aligned external clock and RX config
* fix(clock): cap TX interpolation to x16 to prevent doubled waveform speed
The TX gateware only implements interpolation factors x1..x16 (tx_intrp
0..4), but the rate search could select n==5 (x32) for very low TX
sample rates. That left the AFE/CLK0/CLK1 running at the x32 rate while
the FPGA only interpolated by x16, clocking the TX datapath at twice the
gateware output rate. Cap afe_rate and _resampling_n to the x16 limit in
TX so the clocks stay aligned with the interpolation setting.
* fix(praline): source PLL1 from 40MHz GP_CLKIN instead of 12MHz XTAL
For the intermediate 90-110MHz PLL1 stepping stage, source PLL1 from
GP_CLKIN (Si5351 CLK2/MCU_CLK at 40MHz) giving N=2, M=10, Fclk=100MHz,
rather than the on-chip 12MHz XTAL bootstrap path. This matches the
non-PRALINE path. Remove the dead commented-out XTAL enable/PLL code.
* docs(fpga_bridge): correct register 0x03 description for PRALINE gateware
Register 0x03 is RX_DIGITAL_GAIN in RX and TX_NCO_CTRL in TX, not
RX_PSTEP.
* Fix fpga_tx_set_nco_enable to use FPGA_REG3_TX_NCO_CTRL (0x03)
* Add files via upload
* Add files via upload
* Add files via upload
* Add files via upload
* Add files via upload
* Add files via upload
* Add files via upload
* Add files via upload
* Use new settings in recon
* Trim on string value read, remove dupe entry
* Check update_range flag when setting values
* Add a few saved settings to scanner
* Add copywrite note
* Allow apps to not use persisted freq.
* use rx_freq for RX mode
* remove direct call to persistant_memory in tx_model
* app_setting defaults, and tx_view to use ctor value
Mo
Synray
gullradriel
Totoo
Brumi-2021
Mark Thompson
Kyle Reed
Kyle Reed
jLynx
formtapez
Arjan Onwezen