mangavalk/planar-EL512.256-H
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Note row-stripe brightness drift as panel behaviour

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Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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mangavalkandClaude Opus 5.5 committed 2026-10-18 18:55:26 +02:00
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@@ -75,9 +75,11 @@ Hardware checks:
scope (HS 256 clocks high / 16 low, T6-T8). scope (HS 256 clocks high / 16 low, T6-T8).
- [x] VCLK edge phase: with `INVERT_VCLK = false` the image jittered (rising edge on - [x] VCLK edge phase: with `INVERT_VCLK = false` the image jittered (rising edge on
the byte-pair boundary); `true` puts it mid-pair and the jitter is gone. the byte-pair boundary); `true` puts it mid-pair and the jitter is gone.
- [ ] "row stripes" test image: brightness drifts in slow waves. Unexplained; - [x] "row stripes" test image: brightness drifts in slow waves. Panel behaviour,
suspected beat between the alternating full/empty row load and the panel's not the signal: unchanged at 73.7 Hz (260 clocks/row) vs 70.4 Hz, on a 15 V 4 A
DC/DC converter or row drive. Vcc2 supply, while the checkerboard (same average load, spread within each row)
and all other images are stable. Attributed to the panel's drive reacting to
whole rows alternating fully on / fully off; kept 272 clocks/row.
- [ ] Confirm the `^ 2` byte order. HS edges sit on word boundaries, so a wrong order - [ ] Confirm the `^ 2` byte order. HS edges sit on word boundaries, so a wrong order
does not show on HS; on the panel it shuffles pixels in groups of 8 (a 1-pixel does not show on HS; on the panel it shuffles pixels in groups of 8 (a 1-pixel
line at x = 0 lands at x = 4). line at x = 0 lands at x = 4).