feat(eink): 4.2" 400x300 build with the misc-fixed 9x15 font, wide sim

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

solo/wio-tracker-l1-eink/platformio.ini

@@ -4,13 +4,15 @@
 ; variants in variants/, so this repo's Solo-specific additions don't get
 ; mixed in with configs other MeshCore forks/upstream also carry.
 ;
-; Two builds, one per orientation: each screen is laid out for one shape, and
-; Settings > Rotation only turns it upside down. Landscape writes in the 8x13
-; font at the panel's own resolution (EINK_LARGE_FONT); portrait keeps the 6x9,
-; whose narrow width wants the smaller cell. The joystick reads upright with the
-; panel at rotation 1 (landscape) and turns with it (JOYSTICK_UPRIGHT_ROTATION).
+; Two builds for the 2.13" panel, one per orientation: each screen is laid out
+; for one shape, and Settings > Rotation only turns it upside down. Landscape
+; writes in the 8x13 font at the panel's own resolution (EINK_LARGE_FONT);
+; portrait keeps the 6x9, whose narrow width wants the smaller cell. The
+; joystick reads upright with the panel at rotation 1 (landscape) and turns
+; with it (JOYSTICK_UPRIGHT_ROTATION). A third for a 4.2" 400x300 panel on the
+; same wiring, in the 9x15.
 ;
-; Both: Dual BLE+USB with added Solo.
+; All: Dual BLE+USB with added Solo.
 [eink_solo]
 extends = WioTrackerL1Eink
 ; Optimise for size, not speed: the nRF52 Arduino core defaults to -Ofast
@@ -43,3 +45,16 @@ extends = eink_solo
 build_unflags = ${eink_solo.build_unflags} -D DISPLAY_ROTATION=1
 build_flags = ${eink_solo.build_flags}
   -D DISPLAY_ROTATION=0
+
+; A 4.2" 400x300 panel (Good Display GDEY042T81, SSD1683 -- the 2.13"'s
+; SSD1680's bigger sibling) in place of the 2.13", on the same wiring. Its
+; native orientation is landscape (rotation 0); text in the 9x15.
+[env:WioTrackerL1Eink42_solo_dual]
+extends = eink_solo
+build_unflags = ${eink_solo.build_unflags} -D EINK_DISPLAY_MODEL=GxEPD2_213_B74 -D DISPLAY_ROTATION=1
+  -D JOYSTICK_UPRIGHT_ROTATION=1
+build_flags = ${eink_solo.build_flags}
+  -D EINK_DISPLAY_MODEL=GxEPD2_420_GDEY042T81
+  -D DISPLAY_ROTATION=0
+  -D JOYSTICK_UPRIGHT_ROTATION=0
+  -D EINK_LARGE_FONT=2

src/helpers/ui/EinkGfxDisplay.h

@@ -14,7 +14,8 @@ class Adafruit_GFX;
 // (GxEPDDisplay.cpp on a board, the sim's target.cpp): it pulls in the font
 // tables.
 
-// EINK_LARGE_FONT: a landscape panel writes in the 8x13 at its own resolution.
+// EINK_LARGE_FONT: a landscape panel writes in the 8x13 at its own resolution
+// (1), or the 9x15 (2, the 4.2" 400x300).
 // Without it a landscape panel doubles the 6x9 (every pixel 2x2) -- for small
 // dense panels where 8x13 would be too fine. A portrait panel always uses the
 // 6x9: its narrow width wants the smaller cell.

src/helpers/ui/EinkGfxDisplayImpl.h

@@ -4,7 +4,13 @@
 
 #include "EinkGfxDisplay.h"
 #include "MiscFixedRenderer.h"
-#include "MiscFixed8x13Font.h"
+#if EINK_LARGE_FONT == 2
+  #include "MiscFixed9x15Font.h"
+  #define EINK_LARGE_GFXFONT MiscFixed9x15
+#else
+  #include "MiscFixed8x13Font.h"
+  #define EINK_LARGE_GFXFONT MiscFixed8x13
+#endif
 
 EinkGfxDisplay::EinkGfxDisplay(int w, int h, Adafruit_GFX& gfx, uint16_t ink, uint16_t paper)
     : DisplayDriver(w, h), _gfx(gfx), _ink(ink), _paper(paper), _curr(ink), _font(&MiscFixed) {
@@ -13,7 +19,7 @@ EinkGfxDisplay::EinkGfxDisplay(int w, int h, Adafruit_GFX& gfx, uint16_t ink, ui
 
 void EinkGfxDisplay::updateLayout() {
   const bool landscape = width() >= height();
-  _font = (EINK_LARGE_FONT && landscape) ? &MiscFixed8x13 : &MiscFixed;
+  _font = (EINK_LARGE_FONT && landscape) ? &EINK_LARGE_GFXFONT : &MiscFixed;
   _px = (!EINK_LARGE_FONT && landscape) ? 2 : 1;
   _cell_w = miscFixedCellW(*_font);
   _cell_h = _font->yAdvance;

variants/sim/SimDisplayDriver.h

@@ -463,7 +463,7 @@ public:
 };
 
 #ifdef SIM_EINK_PANEL_W
-// An e-ink panel (the Wio Tracker L1 E-ink's 2.13", 122x250 before rotation):
+// An e-ink panel (the Wio Tracker L1 E-ink's 2.13", 122x250 before rotation, or a 4.2" 400x300):
 // EinkGfxDisplay draws, exactly as GxEPDDisplay does on the board, into a 1-bit
 // canvas, and a frame that changed is put on the page in paper and ink. The
 // host page counts refreshes from Module.__einkRefreshes. Bodies in target.cpp,

variants/sim/build_wasm.sh

@@ -194,15 +194,17 @@ if [ "$SIM_UI" = "lvgl" ]; then
   LINK_EXTRA=(-sFETCH=1)   # map downloads (LvglPort.h) go through emscripten_fetch
 fi
 
-# SIM_EINK=landscape|portrait: ui-new on the Wio Tracker L1 E-ink's 2.13" panel
-# (122x250, solo/wio-tracker-l1-eink's two builds) instead of the OLED ->
-# web/index.html?build=meshcore_sim_eink_landscape (or _portrait).
+# SIM_EINK=landscape|portrait|wide: ui-new on the Wio Tracker L1 E-ink's 2.13"
+# panel (122x250, solo/wio-tracker-l1-eink's two builds) or the 4.2" one
+# (400x300, its third) instead of the OLED ->
+# web/index.html?build=meshcore_sim_eink_landscape (or _portrait, _wide).
 SIM_EINK="${SIM_EINK:-}"
 if [ -n "$SIM_EINK" ]; then
   case "$SIM_EINK" in
-    landscape) EINK_DEFS=(-DDISPLAY_ROTATION=1 -DEINK_LARGE_FONT=1); EXPORT_NAME=MeshCoreSimEinkLandscape ;;
-    portrait)  EINK_DEFS=(-DDISPLAY_ROTATION=0);                     EXPORT_NAME=MeshCoreSimEinkPortrait ;;
-    *) echo "error: SIM_EINK must be landscape or portrait" >&2; exit 1 ;;
+    landscape) EINK_DEFS=(-DDISPLAY_ROTATION=1 -DEINK_LARGE_FONT=1 -DSIM_EINK_PANEL_W=122 -DSIM_EINK_PANEL_H=250); EXPORT_NAME=MeshCoreSimEinkLandscape ;;
+    portrait)  EINK_DEFS=(-DDISPLAY_ROTATION=0 -DSIM_EINK_PANEL_W=122 -DSIM_EINK_PANEL_H=250);                     EXPORT_NAME=MeshCoreSimEinkPortrait ;;
+    wide)      EINK_DEFS=(-DDISPLAY_ROTATION=0 -DEINK_LARGE_FONT=2 -DSIM_EINK_PANEL_W=400 -DSIM_EINK_PANEL_H=300); EXPORT_NAME=MeshCoreSimEinkWide ;;
+    *) echo "error: SIM_EINK must be landscape, portrait or wide" >&2; exit 1 ;;
   esac
   OUT_NAME="meshcore_sim_eink_$SIM_EINK"
   # Distinct factories (set above): web/mesh.html?a=... loads one beside
@@ -213,7 +215,7 @@ if [ -n "$SIM_EINK" ]; then
   done
   # EINK_DISPLAY_MODEL is only tested for presence outside GxEPDDisplay
   # (Features.h: the e-ink settings and timings), which the sim doesn't build.
-  DEFINES=("${kept[@]}" -DDISPLAY_CLASS=SimEinkDisplay -DSIM_EINK_PANEL_W=122 -DSIM_EINK_PANEL_H=250
+  DEFINES=("${kept[@]}" -DDISPLAY_CLASS=SimEinkDisplay
            -DEINK_DISPLAY_MODEL=SimEinkPanel -DMAX_GROUP_CHANNELS=40 "${EINK_DEFS[@]}")
 fi
 

variants/sim/web/index.html

@@ -158,7 +158,7 @@
 
   <div id="log"></div>
 
-  <!-- ?build=meshcore_sim_eink_landscape (or _portrait) loads another build of
+  <!-- ?build=meshcore_sim_eink_landscape (or _portrait, _wide) loads another build of
        the same UI; the e-ink driver sizes the canvas itself. -->
   <script>
     document.write('<script src="build/' +
@@ -215,7 +215,7 @@
       }
     }
 
-    const SimFactory = window.MeshCoreSimEinkLandscape || window.MeshCoreSimEinkPortrait || window.MeshCoreSim;
+    const SimFactory = window.MeshCoreSimEinkLandscape || window.MeshCoreSimEinkPortrait || window.MeshCoreSimEinkWide || window.MeshCoreSim;
     if (typeof SimFactory !== 'function') {
       statusEl.textContent = 'error: build/meshcore_sim.js missing or failed to load -- run variants/sim/build_wasm.sh first.';
     } else {

variants/sim/web/mesh.html

@@ -231,14 +231,14 @@
 
   <script src="build/meshcore_sim.js"></script>
   <script src="build/repeater/meshcore_sim_repeater.js"></script>
-  <!-- ?a=meshcore_sim_eink_landscape (or _portrait): A is that e-ink build. -->
+  <!-- ?a=meshcore_sim_eink_landscape (or _portrait, _wide): A is that e-ink build. -->
   <script>
     const A_BUILD = (new URLSearchParams(location.search).get('a') || '').replace(/[^\w]/g, '');
     if (A_BUILD) document.write('<script src="build/' + A_BUILD + '.js"><\/script>');
   </script>
   <script>
     const logEl = document.getElementById('log');
-    const FactoryA = (opts) => (window.MeshCoreSimEinkLandscape || window.MeshCoreSimEinkPortrait || MeshCoreSim)(opts);
+    const FactoryA = (opts) => (window.MeshCoreSimEinkLandscape || window.MeshCoreSimEinkPortrait || window.MeshCoreSimEinkWide || MeshCoreSim)(opts);
     function log(msg) {
       const line = document.createElement('div');
       line.textContent = '[' + new Date().toISOString().substr(11, 12) + '] ' + msg;