Fix 3.5C board pins per CYD guide: BL=27, GY30 SCL=21.

Correct black-screen backlight, free GPIO21 after GT911 init (Wire1), export/flash cyd_35r package.

Co-authored-by: Cursor <cursoragent@cursor.com>

include/lv_conf.h

@@ -5,7 +5,9 @@
 
 #define LV_COLOR_DEPTH 16
 
+#ifndef LV_MEM_SIZE
 #define LV_MEM_SIZE (48 * 1024U)
+#endif
 #define LV_DEF_REFR_PERIOD 16
 #define LV_DPI_DEF 130
 

include/touch.h

@@ -0,0 +1,6 @@
+#pragma once
+
+#include <lvgl.h>
+
+void touch_init();
+void touch_read_cb(lv_indev_t *indev, lv_indev_data_t *data);