Add optional cyd_35r (ESP32-3248S035) with 480x320 UI; default remains 2.8.

include/pins.h

@@ -1,16 +1,20 @@
 #pragma once
 
-// CYD ESP32-2432S028R
+// Board pins — 2.8" default; 3.5" when CYD_BOARD_3248S035 is set (env:cyd_35r)
 
+#if defined(CYD_BOARD_3248S035)
+#define TFT_BL_PIN 27
+#define SCREEN_WIDTH  320
+#define SCREEN_HEIGHT 480
+#define UI_HOR_RES    480
+#define UI_VER_RES    320
+#else
 #define TFT_BL_PIN 21
-
-// TF / microSD (VSPI；触摸用 SoftSPI，不抢总线)
-#define SD_MISO 19
-#define SD_MOSI 23
-#define SD_SCK  18
-#define SD_CS   5
-
-#define SPEAKER_PIN 26
+#define SCREEN_WIDTH  240
+#define SCREEN_HEIGHT 320
+#define UI_HOR_RES    320
+#define UI_VER_RES    240
+#endif
 
 #define CYD_TOUCH_IRQ  36
 #define CYD_TOUCH_MOSI 32
@@ -18,7 +22,15 @@
 #define CYD_TOUCH_CLK  25
 #define CYD_TOUCH_CS   33
 
-#define SCREEN_WIDTH  240
-#define SCREEN_HEIGHT 320
-#define UI_HOR_RES    320
-#define UI_VER_RES    240
+/* Map 320x240 design coordinates onto the active UI resolution (identity on 2.8"). */
+#define UX(x) ((int)(((long)(x) * (UI_HOR_RES)) / 320))
+#define UY(y) ((int)(((long)(y) * (UI_VER_RES)) / 240))
+#define UW(w) UX(w)
+#define UH(h) UY(h)
+
+
+#define SD_MISO 19
+#define SD_MOSI 23
+#define SD_SCK  18
+#define SD_CS   5
+#define SPEAKER_PIN 26