twin_glue.c
WASM entry points: the twin page's firmware harness.
Overview
WASM entry points: the twin page's firmware harness. Compiled (emcc) with the untouched modules/woz_uwb sources plus the same tests/host shim the host suite links, so the page runs the real responder: every block is a genuinely CCM*-encrypted Pre-POLL/POLL/Response/Final/ Final_Data exchange decoded by the firmware's own RX state machine, and the page reads its decisions through the same facade seam the lock uses. The peer (iPhone) side comes from tests/host/twin_frames.c — shared with test_twin.c, so the page and the suite drive the responder identically. The JS above supplies only the world: target distance, noise, spoof timing, and the pacing of the five per-block legs (PREPOLL/POLL/TXDONE/FINAL/FINAL_DATA) so a visitor can single-step a live DS-TWR round. Distance is injected the way physics does it: the initiator-side DS-TWR intervals ride in the Final_Data as round1 = reply1 + 2*tof and reply2 = round2 - 2*tof, which makes the firmware's own (round1*round2 - reply1*reply2)/sum recover exactly tof ticks (1 tick ~ 15.65 ps, ~4.692 mm — ccc_shim_rx.c final_data_decode). A Ghost-Peak spoof is a negative-tof block through the same full path.
API
Fstatic void twin_on_latch(void)
Increment the digital twin's latch counter on each successful Aliro unlock decision.
FEMSCRIPTEN_KEEPALIVE int twin_boot(void)
Boot the responder once per module instance (the page's Reset re-instantiates the module, i.e. reboots the firmware). Returns 0 on success.
Fstatic int32_t tof_for_cm(int32_t cm)
Target distance -> ToF ticks, the inverse of final_data_decode's d_mm = tof * 4692 / 1000 (rounded so the round-trip is stable).
twin_stepFEMSCRIPTEN_KEEPALIVE int twin_step(int cm)
Run the next leg of the current ranging block against the live firmware: 0 Pre-POLL RX — encrypted SP0 frame; RX event arms the SP3 POLL window 1 POLL result — STS-only RFRAME at the armed index; fires Response_0 TX 2 Response TXFRS — t3 captured; the Final RX window is armed 3 Final RFRAME — t6 + STS quality captured; radio reverts to SP0 4 Final_Data — dUDSK-encrypted timestamps; DS-TWR computes and latches @p cm is consumed at leg 4 (the initiator timestamps carry the distance). Returns the leg just executed.
twin_block · calls tof_for_cmFEMSCRIPTEN_KEEPALIVE void twin_block(int cm)
Run legs to the end of the current block (one full DS-TWR exchange).
twin_stepFEMSCRIPTEN_KEEPALIVE int twin_leg(void)
Next leg within the block, 0..4 (0 = a fresh block is about to start).
FEMSCRIPTEN_KEEPALIVE int twin_last_cm(void)
Facade telemetry seam: latest latched range, or TWIN_NO_RANGE.
FEMSCRIPTEN_KEEPALIVE int twin_trusted_cm(void)
Facade unlock seam: the trusted range, or TWIN_NO_RANGE while trust is out.
FEMSCRIPTEN_KEEPALIVE int twin_trust_level(void)
Layer-4 trust run length (0..K).
FEMSCRIPTEN_KEEPALIVE int twin_trust_k(void)
FIRA_RANGE_TRUST_K, straight from the compiled firmware.
FEMSCRIPTEN_KEEPALIVE int twin_plausible(int cm)
Layer-1 plausibility predicate (for the self-test).
FEMSCRIPTEN_KEEPALIVE int twin_take_latches(void)
Accepted-latch count since last asked (the app_main task-notify analogue); reading clears it. A rejected block never wakes this seam.
FEMSCRIPTEN_KEEPALIVE int twin_awaiting_poll(void)
True while the SP3 RX is armed for the POLL (ccc_shim_rx state).
FEMSCRIPTEN_KEEPALIVE unsigned twin_stat_rxenable(void)
Radio-stub call counters + wire-side identities, for the debug panel.
FEMSCRIPTEN_KEEPALIVE unsigned twin_stat_starttx(void)
Retrieve the count of transmit-start calls logged by the digital twin's host-shim radio interface.
FEMSCRIPTEN_KEEPALIVE unsigned twin_poll_index(void)
Retrieve the current poll queue index in the digital twin's main loop.
FEMSCRIPTEN_KEEPALIVE unsigned twin_block_no(void)
Retrieve the current UWB block (repetition) counter in the digital twin.