ipsc2hbpc

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Cort BuffingtonandClaude Opus 5.5 ec8bbfaedc HBP->IPSC: accept 53-byte DMRD, carry RSSI, set the slot bit; drop old RSSI encoding

DMRD bytes 53-54 (BER, RSSI) are optional on input: HBlink3 passes a
53-byte DMRD through unchanged. Accept anything from 53 bytes and read
byte 54 only when present; output is still 55 bytes.

DMRD byte 54 of a voice header or terminator now goes into the RSSI
field (bytes 52-53) of the VOICE_HEAD / VOICE_TERM built from it, as
8.8 fixed-point -dBm. No reading (53 bytes, 0, or a synthesized
HEAD/TERM) sends 0 as before. The terminator reading is cleared at the
end of each call so it cannot reach a later synthesized TERM.

Byte 31 bit 7 of VOICE_HEAD / VOICE_TERM is the timeslot (0x40 / 0xC0
in repeater captures); it was hardcoded 0x80 (TS2). The RSSI status
bit (bit 6) is left 0.

The old firmware RSSI encoding (-56 dB offset) is dropped: no repeater
using it is known. [ipsc] rssi_encoding_new is no longer read; configs
that still carry it load unchanged.

Tests: 53/55-byte input, RSSI round trip through the IPSC->HBP decoder,
slot bit, terminator reading not carried into the next call, legacy
key fixture, and a late-entry case where only the LC-error bit can
reject a corrupt burst E LC. parity_ref_gv.txt byte 31 corrected to
TS1.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

2026-10-21 07:41:11 -05:00

dsp_vectors.txt

Initial commit: ipsc2hbpc — C reimplementation of ipsc2hbp

2026-06-17 08:37:41 -05:00

lateentry_ipsc_in.txt

IPSC->HBP late entry: test burst E control bits, not the whole byte

2026-10-13 10:51:04 -05:00

parity_in_dmrd.txt

translate: clock entire HBP→IPSC call through the jitter buffer

2026-06-22 09:51:01 -05:00

parity_in.txt

IPSC->HBP: send MMDVMHost silence for AMBE frames the repeater flags bad