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MMDVM
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163 Commits

Author SHA1 Message Date
Cort Buffington d70ab85bae Copy-construct the ds/us filters from m_filterStage1/2/3 
Same coefficients, no need to retype them. CFMDirectFormI's copy ctor
already copies coefficients and (zeroed, at this point) state.
 2026-08-13 13:52:06 -05:00
Cort Buffington 384c5d559d Reconstruction filter after ext-audio upsampling in FM mode 
CFMUpSampler zero-stuffs 8kHz to 24kHz with no lowpass after it,
leaving imaging artifacts in the reconstructed ext audio. Filter it
with a second, separately-stated pass of the same 300-2700Hz design
already used for TX shaping, right where it comes out of the upsampler.
 2026-08-12 07:43:23 -05:00
Cort Buffington 4c7e8fbe46 Anti-alias filter before RF->network downsampling in FM mode 
The 24kHz->8kHz decimation in CFMDownSampler had no lowpass ahead of
it, aliasing everything above 4kHz back into the audio band. Reuse
the existing 300-2700Hz filter design (separate instance/state) ahead
of all three addSample() call sites in FM.cpp.

Also: reset() wasn't clearing the ring buffer or in-progress sample
pack, so stale audio could bleed into the next transmission. And
addSample() packed samples into 12 bits with no saturation, so an
out-of-range value corrupted the neighbouring sample.
 2026-08-11 09:57:47 -05:00
Cort Buffington 8a89804fda
Refactor FM_LINK_EXT_GAP_MS and improve comments 
Updated the FM_LINK_EXT_GAP_MS constant declaration and added comments for clarity.
 2026-08-11 08:55:22 -05:00
Cort Buffington 8bd467598c Debounce link-mode external-audio underrun before dropping PTT 
Under [FM] LinkMode=1, linkStateMachine() set m_extSignal false the
instant a single ext-audio sample went missing, with no debounce --
unlike the non-link duplex/simplex paths, which already tolerate a
brief gap via the RELAYING_EXT -> RELAYING_WAIT_EXT / m_ackDelayTimer
pattern before declaring a real loss. Since IO::process() drops PTT
the moment the downstream TX buffer runs dry, that zero-debounce cutoff
meant even a very brief, late-but-recoverable gap from the gateway
(scheduling jitter, a late UDP frame, etc.) could cascade into a full
PTT drop-and-rekey cycle -- far more audible than the underlying gap
itself.

Adds m_extGapTimer, mirroring the existing pattern: on the first missed
sample, start the timer instead of immediately clearing m_extSignal; a
gap that recovers before FM_LINK_EXT_GAP_MS (default 60ms) expires
never affects m_extSignal at all, so the transmitter never notices.
Only a gap that outlasts the timer is treated as a genuine end of
transmission, exactly as before.

linkSamples()'s currentExtSample is now zero-initialized, since
m_extSignal can now stay true for a few samples past an underrun --
silence, not stack garbage, must be what gets played out to the modem
during that window.
 2026-08-09 11:42:20 -05:00
Jonathan Naylor 5dd59fc473 Merge branch 'master' into mqtt 2025-08-28 17:00:21 +01:00
Jonathan Naylor 824c9b9852 Widened the size of serial data going into M17 and FM. 2025-01-13 15:05:28 +00:00
Jonathan Naylor a7fddc37e1 Don't send a status when the FM repeater is reset, it causes a loop. 2023-11-18 16:45:36 +00:00
Jonathan Naylor 3e079f58ad Add RSSI reporting to FM and AX.25 2023-08-02 17:34:52 +01:00
Jonathan Naylor 7ef0d992d9 Improve the status reporting for FM mode. 2023-01-18 14:30:02 +00:00
Jonathan Naylor ee07f76bd5 Split the repeater and link mode audio paths. 2021-09-30 18:16:51 +01:00
Jonathan Naylor 6a4dad4c44 Change the LinkMode state machine. 2021-09-06 22:50:40 +01:00
Jonathan Naylor ed6bd66fab Rename SimpleMode to LinkMode. 2021-09-06 21:53:01 +01:00
Jonathan Naylor 1a07a6f0d1 Add more details to the simple FM state machine. 2021-09-05 19:46:01 +01:00
Jonathan Naylor 70bf47f93e Add a bery simple FM mode for internet gatewaying. 2021-09-05 19:06:56 +01:00
Jonathan Naylor 1df7d7a7fc Change the FM serial block size to 80. 2021-03-07 19:01:46 +00:00
Jonathan Naylor 81518bf74c Make AX.25, DMR, P25, NXDN and FM selectable at compile time. 2020-11-08 22:23:27 +00:00
Jonathan Naylor 2a001f491d Simplify the CTCSS and Noise Squelch decoders and logic. 2020-07-31 09:20:55 +01:00
Jonathan Naylor d8f138066e Add an experimental noise squelch. 2020-07-28 13:55:50 +01:00
Jonathan Naylor 9ff59570c7 Merge branch 'AX25' into AX25_FM 2020-07-15 10:42:43 +01:00
Jonathan Naylor 1ac0628c1c Improve the code efficiency slightly. 2020-07-14 14:54:47 +01:00
Jonathan Naylor dc41fd83d2 Test the use of a reverse burst at the end of a transmission. 2020-07-14 12:20:42 +01:00
Jonathan Naylor 20013e3adc Make Use COS As Lockout a run-time parameter and allow for different access modes. 2020-07-13 17:13:01 +01:00
Jonathan Naylor 5960fb97f3 Merge branch 'AX25' into AX25_FM 2020-07-12 15:28:00 +01:00
Jonathan Naylor ccdbe126e0 Fix the timeout tones. 2020-07-12 15:22:35 +01:00
Jonathan Naylor ad77fd60fd Remove KerchunkTX. 2020-07-07 17:57:31 +01:00
Jonathan Naylor aab8f5469f Add timeouts to the FM simplex state machine. 2020-07-06 10:56:35 +01:00
Jonathan Naylor c99f50575d Add a simpe simplex FM controller state machine. 2020-07-01 13:02:14 +01:00
Jonathan Naylor 14d5098018 Rename FMDownsampler to FMDownSampler. 2020-06-30 12:44:02 +01:00
Jonathan Naylor 0ea732780d Implement Kerchunk TX option. 2020-06-20 21:03:11 +01:00
Geoffrey Merck 4f060c0047 Esnure frame size is 84 samples, correctly report space as number of frames 2020-05-31 21:50:06 +02:00
Geoffrey Merck 72cd2ce03e Ensure we have at least 75ms of audio before transmitting 2020-05-30 20:05:34 +02:00
Geoffrey Merck f14222e77d Make sure buffer is continuously filled 2020-05-23 08:25:51 +02:00
Jonathan Naylor f9f81b9b8e Try and make the closing callsign appear. 
(cherry picked from commit 063b21f999)
 2020-05-20 23:11:22 +02:00
Geoffrey Merck 3cc5d67696 check acks 2020-05-20 22:51:22 +02:00
Geoffrey Merck 3f960f9fc5 Fix Callsignatend and simplify Samples 2020-05-20 22:30:55 +02:00
Jonathan Naylor e7a22482db Set the COS LED on incoming RF transmissions. 2020-05-19 13:45:17 +01:00
Jonathan Naylor 5f29808b80 Set the COS LED correctly. 2020-05-19 12:09:44 +01:00
Jonathan Naylor 063b21f999 Try and make the closing callsign appear. 2020-05-18 11:09:56 +01:00
Jonathan Naylor 625749a546 Fixed up the use of the writeFMEOT method. 2020-05-16 13:15:21 +01:00
Geoffrey Merck 48e863d1d0 Sent EOT on rf timeout 2020-05-15 21:19:26 +02:00
Geoffrey Merck 7b915f9cac Only send EOT when EXT is enabled 2020-05-15 21:06:16 +02:00
Geoffrey Merck 388620b182 Add FM EOT 2020-05-15 18:53:34 +02:00
Jonathan Naylor ff375abb0e Hold off the mode change until the ack and callsign have been 
transmitted.
 2020-05-14 12:10:37 +01:00
Geoffrey Merck cfcb7ed852 Really fix TX Buffer ovrflows,, reduce delay buffer memory footprint 2020-05-14 09:10:11 +02:00
Geoffrey Merck b245be464f Fix txbuffer overflows and bring back elegant while loop 2020-05-13 22:57:42 +02:00
Geoffrey Merck df23e15c91 Fix compilation warnings 2020-05-13 11:52:59 +02:00
Geoffrey Merck 62f239ccc9 Fix modem crash while writing to serial, Split IO write and serial write to 2 separate loops. 2020-05-13 08:31:59 +02:00
Geoffrey Merck 994226e4b1 Tighten incoming data, Add FM UpSampler 2020-05-12 22:06:26 +02:00
Geoffrey Merck 8e8cf35b19 Merge remote-tracking branch 'upstream/FM_Ext' into FM_Ext 2020-05-12 17:55:41 +02:00