esp32-lcd-dev

Waveshare ESP32-S3-Touch-LCD-4.3B — Board Reference

You are working with the Waveshare ESP32-S3-Touch-LCD-4.3B board. This skill provides comprehensive hardware specs, GPIO pinout, and PlatformIO project setup so you can develop without searching the web.

Quick Facts

Feature	Detail
MCU	ESP32-S3-WROOM-1 (dual-core Xtensa LX7, 240 MHz)
PSRAM	8 MB OPI (Octal SPI, 80 MHz)
Flash	8 MB QIO
Display	4.3" 800×480 RGB LCD, ST7262 controller, RGB565
Touch	GT911 capacitive, I2C (SDA=GPIO8, SCL=GPIO9)
IO Expander	CH422G at I2C 0x20 (backlight, reset, SD)
USB	USB-C with native CDC serial

Reference Files

For detailed information, read these reference files:

• Hardware Specs — Full hardware reference: display timing, touch config, IO expander, PSRAM, USB, init sequences
• GPIO Pinout — Complete GPIO pin map with occupied/free summary
• PlatformIO Setup — Ready-to-use platformio.ini, lv_conf.h, and main.cpp skeleton

Key Reminders

• The LCD uses drawBitmap(x, y, width, height, data) — not (x1, y1, x2, y2, data)
• Backlight is on/off only (no PWM) via CH422G pin 2
• Touch and IO expander share the same I2C bus (GPIO8/GPIO9)
• Always use BOARD_WAVESHARE_ESP32_S3_TOUCH_LCD_4_3_B build flag — it auto-configures the ESP32_Display_Panel library
• LVGL must run on a dedicated FreeRTOS task with a recursive mutex for thread safety
• This plugin targets PlatformIO with LVGL v8.4. LVGL v9 has a completely different API (no lv_disp_drv_t) and is not covered here. For ESP-IDF or Arduino IDE setups, see the Waveshare wiki