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docs: correct the DRV8825 reset-line fact in the wedge entry

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The nRESET and nSLEEP lines are not strapped: glowforge.ko drives them
(reset-gpio gpio3 18, sleep-gpio gpio3 16), confirmed by pad traces to
U20/U21/U22 pins 16 and 17. They move only as a pair in every
enable/disable cycle, together with the rail, so the reset pulse is part
of every recovery attempt and has never shortened the ladder. A logic
reset alone does not clear the wedge.
This commit is contained in:
ScottW514
2026-08-31 15:23:00 -04:00
parent 99902a1579
commit 8d68cee5bf
1 changed files with 7 additions and 2 deletions
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docs/BRINGUP.md
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@@ -788,8 +788,13 @@ is committed.
TMC2130s belong to the upgraded OpenGlow board only). A glitch can leave the TMC2130s belong to the upgraded OpenGlow board only). A glitch can leave the
drivers unserviceable: SDMA playback and the position counters run normally drivers unserviceable: SDMA playback and the position counters run normally
while the motors produce nothing. The supply itself is fine — this is a while the motors produce nothing. The supply itself is fine — this is a
driver failure mode, not a marginal rail. Their reset lines are strapped (no driver failure mode, not a marginal rail. The kernel drives their nRESET and
kernel pin), `cnc/faults` does not flag the state, and whether a given rail nSLEEP pins (`reset-gpio` gpio3 18, `sleep-gpio` gpio3 16), but only as a
pair inside every enable/disable cycle, together with the rail: the reset
pulse rides along on every recovery attempt and has never shortened the
ladder, so a logic reset alone does not clear the state (only the rail-off
duration matters, which fits a latched internal state that nRESET does not
reach). `cnc/faults` does not flag the state, and whether a given rail
power-up wedges them is chance. Recovery: a longer true power-off (the power-up wedges them is chance. Recovery: a longer true power-off (the
forgectrl supervisor ladders 5/15/30 s) and, at worst, a full machine power forgectrl supervisor ladders 5/15/30 s) and, at worst, a full machine power
cycle. Consequences: **counters, anchors and `H:1` are never proof of cycle. Consequences: **counters, anchors and `H:1` are never proof of