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62500 SHELVED: chord-driven RX overrun is host-unfixable; 31250v2 is FastRIO

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Slow chorded presses still glitch lamps at 62500 after three rounds of
host-side hardening (NAK-race resend -> stop-and-wait -> typed
resolution): a chord maximizes board ISR latency exactly when lamp
replies arrive, and a 2-byte RX buffer loses bytes no protocol can
recover. Full post-mortem in ANALYSIS.md; all bench evidence archived.
Final ladder: 9600 production / 31250v2 FastRIO / 62500 shelved /
125000 not viable. Stop-and-wait stays on everywhere as cheap delivery
insurance.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
This commit is contained in:
Cyd
2026-07-19 13:40:48 -05:00
co-authored by Claude Fable 5
parent bef1499152
commit 3c9455eb97
2 changed files with 60 additions and 0 deletions
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testlogs/riomash-patched-62500-sw-20260719-133628.log
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== RIO mash test :: COM1 @ 62500 8N1, 300s, chip label 'patched-62500-sw' ==
lamp echo ON (drives reply/lamp collisions), wedge threshold 2.0s, app auto-recovery DISABLED
log: C:\VWE\riojoy\riomash-patched-62500-sw-20260719-133628.log
firmware: 4.2
counters before: RestartCount=0 AbandonCount=0 FullBufferCount=0 [board/lamp faults reported!]
>>> MASH NOW: two hands, 8 lamp buttons, as fast as you can. <<<
>>> Test runs 300s. A wedge alarm will beep + banner. <<<
>>> Ctrl+C ends the run early and still prints the summary. <<<
[ 31.90s] progress: presses=72 (72/min) analog=497 maxGap=0.21s wedges=0
[ 58.27s] operator stop (Ctrl+C) — ending run, snapshotting counters...
== MASH SUMMARY [patched-62500-sw] ==
run : 58s on COM1, lamps on, wedge threshold 2.0s
firmware : 4.2
presses/releases : 123 / 123 (124 presses/min)
analog replies : 931 (~1054 poll slots; 88.3%), sentinels 0
framing / NAK : 7 / 20 (command resends NAK/timeout: 34)
gap histogram : <100ms:921 100-250ms:9 250-500ms:0 0.5-1s:0 1-2s:0 2-5s:0 >5s:0
longest gaps : 0.22s@58.3s, 0.21s@0.6s, 0.14s@41.9s, 0.14s@26.8s, 0.13s@23.6s, 0.11s@12.4s, 0.11s@24.4s, 0.10s@54.1s, 0.10s@53.4s, 0.10s@16.5s
wedge events : 0
counters before : RestartCount=0 AbandonCount=0 FullBufferCount=0 [board/lamp faults reported!]
counters after : RestartCount=0 AbandonCount=0 FullBufferCount=0 [board/lamp faults reported!]
counter delta : RestartCount=+0 AbandonCount=+0 FullBufferCount=+0
verdict : PASS — no wedge; compare gap histogram + counter delta to baseline
log file : C:\VWE\riojoy\riomash-patched-62500-sw-20260719-133628.log