laser_lifecycle_test.py: the button toggle (press = Hold, press = Run;
the arming press is not a pause), lid and interlock cancel mid-job with
the return to the job start and no alarm, and lid_policy=hold.
Acceptance catalog: motion.button-hold-resume, motion.lid-cancel-home
(operator: travel job, lid open -> cancel message, banner, no alarm,
autonomous return, Idle at the start), laser.lid-cancel-mid-fire (live:
emission stops in hardware, cancelled, returned, armed=false, latch
locked, hardware button latch SET). covers name the switch and laser
sources explicitly.
LIGHTBURN.md: what the lid, Stop and the button now do; SAFETY.md: the
door policy and the button as a software layer; BRINGUP.md: item 16
records the whole parity change (host-proven, bench validation pending)
and items 4/12 point at it.
SAFETY.md and the safing figure name GPIO4_06 for what it is - the
readback of the chain's HV_ENABLE output through U24 (the factory net
label E-STOP is kept as a note); BRINGUP records the rename, the
device-tree polarity flip that makes bit 4 read as HV_ENABLE itself,
the removal of the estop_halts_motion opt-in, and the bench check for
the flash that ships it. Recipe pins move to forgectrl 801f1f3,
grblHAL-glowforge b629c18 and python3-gfhardware c3d1790 (PV 0.1.5).
Loop pull sets interlock_latch_reset + interlock_latch within one 50 ms sample and both clear on reinsert; charge_pump_alive tracks the run and falls 0.45 s after the last charge-pump pulse (matches the measured R*C); estop follows it on both edges. Note that an interlock trip parks grblHAL in Door:0 until a cycle start.
docs/SAFETY.md documents the control board's laser safing chain as
reverse-engineered and bench-verified - parts, every net with its SoC pin,
Linux exposure and polarity, the logic, and the software layers ForgeFIRM
stacks on it - with docs/img/safety-chain.svg. Linked from the README.
BRINGUP: Next work item 11 records the interlock-latch finding (an open
loop never tripped the latch; the kernel now drives INTERLOCK_LATCH_RESET)
and the charge-pump watchdog readback, both code-complete and pinned,
bench validation on the next image.
ScottW514