From 17d2aa134d1c7ac063316b6836f739976418f9d9 Mon Sep 17 00:00:00 2001
From: Me Here <me@here>
Date: Sun, 31 May 2026 21:16:34 -0500
Subject: [PATCH] pm-kit: diagnostic display pattern + flip_horizontal (fix
 mirror)

Replace clear() with same-path full-screen fill, add a 4-edge red border, four
distinct corner markers (TL green / TR yellow / BL cyan / BR magenta) and a TL
label, to pin down rotation/mirror/size from one flash. Apply flip_horizontal to
match the panel's MADCTL MX bit (CircuitPython uses 0x48).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
---
 rust/pm-kit/src/main.rs | 46 ++++++++++++++++++++++++++++++++---------
 1 file changed, 36 insertions(+), 10 deletions(-)

diff --git a/rust/pm-kit/src/main.rs b/rust/pm-kit/src/main.rs
index 94c2b42..9d4393e 100644
--- a/rust/pm-kit/src/main.rs
+++ b/rust/pm-kit/src/main.rs
@@ -11,7 +11,7 @@ use embedded_graphics::{
     mono_font::{ascii::FONT_10X20, MonoTextStyle},
     pixelcolor::Rgb565,
     prelude::*,
-    primitives::{PrimitiveStyle, Rectangle},
+    primitives::{PrimitiveStyle, PrimitiveStyleBuilder, Rectangle},
     text::Text,
 };
 use embedded_hal::delay::DelayNs;
@@ -81,20 +81,46 @@ fn main() -> ! {
         .display_size(WIDTH, HEIGHT)
         .color_order(ColorOrder::Bgr)
         .invert_colors(ColorInversion::Inverted)
-        .orientation(Orientation::new())
+        .orientation(Orientation::new().flip_horizontal()) // panel wants MX set (matches CircuitPython MADCTL 0x48)
         .init(&mut timer)
         .unwrap();
 
-    // background
-    display.clear(Rgb565::new(2, 4, 8)).unwrap();
-    // a panel + label so we can see SPI + the graphics stack working
-    Rectangle::new(Point::new(20, 60), Size::new((WIDTH - 40) as u32, 140))
-        .into_styled(PrimitiveStyle::with_fill(Rgb565::new(2, 40, 50)))
+    let w = WIDTH as i32;
+    let h = HEIGHT as i32;
+    let m = 36; // marker size
+
+    // Full-screen fill via the SAME draw path as the shapes (clear() left snow last time).
+    Rectangle::new(Point::zero(), Size::new(WIDTH as u32, HEIGHT as u32))
+        .into_styled(PrimitiveStyle::with_fill(Rgb565::new(0, 0, 12)))
         .draw(&mut display)
         .unwrap();
-    let title = MonoTextStyle::new(&FONT_10X20, Rgb565::WHITE);
-    Text::new("PM-KIT", Point::new(40, 110), title).draw(&mut display).unwrap();
-    Text::new("RUST OK", Point::new(40, 150), title).draw(&mut display).unwrap();
+    // Red 8px border on all four edges — if any edge is missing, the addressed area != panel.
+    Rectangle::new(Point::zero(), Size::new(WIDTH as u32, HEIGHT as u32))
+        .into_styled(
+            PrimitiveStyleBuilder::new()
+                .stroke_color(Rgb565::RED)
+                .stroke_width(8)
+                .build(),
+        )
+        .draw(&mut display)
+        .unwrap();
+    // Distinct corner markers so orientation/mirror is unambiguous.
+    let ms = Size::new(m as u32, m as u32);
+    for (x, y, c) in [
+        (0, 0, Rgb565::GREEN),       // top-left
+        (w - m, 0, Rgb565::YELLOW),  // top-right
+        (0, h - m, Rgb565::CYAN),    // bottom-left
+        (w - m, h - m, Rgb565::MAGENTA), // bottom-right
+    ] {
+        Rectangle::new(Point::new(x, y), ms)
+            .into_styled(PrimitiveStyle::with_fill(c))
+            .draw(&mut display)
+            .unwrap();
+    }
+    // Labels: "TL" near origin, big "PMK" centred.
+    let label = MonoTextStyle::new(&FONT_10X20, Rgb565::WHITE);
+    Text::new("TL", Point::new(44, 28), label).draw(&mut display).unwrap();
+    Text::new("PMK", Point::new(w / 2 - 30, h / 2), label).draw(&mut display).unwrap();
 
     loop {
         led.set_high().unwrap();