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pm-kit: minimal 0xB6 (no unlock) bracketed by DISP off/on for line count

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The 0xF0 extension unlock (gates gamma/power) was the likely blanker; 0xB6 is a
basic command and needs no unlock. Strip to just DISPOFF -> 0xB6(480 lines) ->
DISPON, the one change vs mipidsi's working-but-1/4 baseline.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This commit is contained in:
Me Here 2026-05-31 22:28:44 -05:00
parent 508fae56fb
commit b2ea27f506
1 changed files with 7 additions and 26 deletions
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33
rust/pm-kit/src/main.rs
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@ -79,37 +79,18 @@ fn main() -> ! {
.init(&mut timer)
.unwrap();
// mipidsi's ST7796 model uses the ST7789 init (SLPOUT, MADCTL=0x48, INVON, COLMOD, NORON,
// DISPON — confirmed via the host initdump). It omits the ST7796 extension setup, and doing
// it *after* mipidsi's DISPON (on a live panel) blanks the screen. So replay the full,
// known-good CircuitPython st7796_init here, ending in its own DISPON. MADCTL stays 0x48,
// which is exactly what mipidsi's drawing already assumes — so draws map correctly.
// Minimal: mipidsi's plain init already lit the panel (milestone 2 showed content, just in a
// sub-region because the gate scan wasn't set to 480 lines). 0xB6 (Display Function Control)
// fixes the line count and is a BASIC command — it does NOT need the 0xF0 extension unlock
// (the unlock gates gamma/power, and was the likely blanker). Bracket it with DISP off/on so
// the scan is reconfigured while the display is off, the way CircuitPython does it.
{
let di = unsafe { display.dcs() };
di.send_command(0x01, &[]).unwrap(); // SWRESET
timer.delay_ms(120);
di.send_command(0x11, &[]).unwrap(); // SLPOUT
timer.delay_ms(120);
di.send_command(0xF0, &[0xC3]).unwrap(); // unlock extension command set
di.send_command(0xF0, &[0x96]).unwrap();
di.send_command(0x36, &[0x48]).unwrap(); // MADCTL (matches mipidsi orientation)
di.send_command(0x3A, &[0x55]).unwrap(); // COLMOD 16bpp
di.send_command(0xB4, &[0x01]).unwrap();
di.send_command(0x28, &[]).unwrap(); // DISPOFF
di.send_command(0xB6, &[0x80, 0x02, 0x3B]).unwrap(); // display function control: 480 lines
di.send_command(0xE8, &[0x40, 0x8A, 0x00, 0x00, 0x29, 0x19, 0xA5, 0x33]).unwrap();
di.send_command(0xC1, &[0x06]).unwrap();
di.send_command(0xC2, &[0xA7]).unwrap();
di.send_command(0xC5, &[0x18]).unwrap();
timer.delay_ms(120);
di.send_command(0xE0, &[0xF0, 0x09, 0x0B, 0x06, 0x04, 0x15, 0x2F, 0x54, 0x42, 0x3C, 0x17, 0x14, 0x18, 0x1B]).unwrap();
di.send_command(0xE1, &[0xE0, 0x09, 0x0B, 0x06, 0x04, 0x03, 0x2B, 0x43, 0x42, 0x3B, 0x16, 0x14, 0x17, 0x1B]).unwrap();
di.send_command(0xF0, &[0x3C]).unwrap(); // lock
di.send_command(0xF0, &[0x69]).unwrap();
timer.delay_ms(120);
di.send_command(0x21, &[]).unwrap(); // INVON (INVERT_COLORS = true)
di.send_command(0x29, &[]).unwrap(); // DISPON
timer.delay_ms(50);
}
timer.delay_ms(50);
// Same UI code the host simulator renders (rust/uisim → PNG). If this is wrong, the sim
// shows it without the bench; if the sim is right but the panel is wrong, it's a controller