Add LCDWiki 2.8" ESP32-S3 Display board (MARAUDER_LCDWIKI_28)

[pazyuk]

Summary

Adds a new board target, MARAUDER_LCDWIKI_28, for the LCDWiki 2.8" ESP32‑S3 Display
module — an inexpensive all‑in‑one ESP32‑S3 board with a 240×320 IPS panel and capacitive touch.

• Board / wiki: https://www.lcdwiki.com/2.8inch_ESP32-S3_Display
• Full board guide added at docs/boards/LCDWiki_2.8inch_ESP32-S3.md

Hardware

MCU	ESP32‑S3‑WROOM‑1 N16R8 (16 MB flash, 8 MB OPI PSRAM)
Display	2.8" 240×320 IPS, ILI9341V, SPI
Touch	FT6336 capacitive, I²C 0x38 (uses the existing ft6336.h)
microSD	SDIO‑wired slot, driven over SPI
Extras	WS2812 RGB LED, native USB‑C, broken‑out UART + GPIO headers

What's included

• configs.h – new MARAUDER_LCDWIKI_28 target: features, BOOT button, display block,
  touch / SD / GPS pins, menu geometry, and baked FT6336 touch‑calibration constants.
• User_Setup_marauder_lcdwiki_28.h + User_Setup_Select.h – TFT_eSPI setup
  (ILI9341 driver, board pins, USE_FSPI_PORT, BGR).
• Display.cpp – FT6336 touch‑coordinate calibration map, turn the on‑board WS2812 (IO42)
  off, and an optional 2‑point touch‑calibration screen (-DTOUCH_CAL) that prints fresh
  constants over serial.
• SDInterface.cpp/.h – make the existing HAS_SEPARATE_SD flag actually select the
  dedicated‑SPI‑bus init, and hold the SDIO DAT1/DAT2 lines high while using the slot in SPI mode.
• esp32_marauder.ino – when the console is USB‑CDC, don't block boot forever waiting for a
  host to open the port (so the board also runs off a powerbank/charger).
• docs/ – board guide with the full pinout, free pins, build steps and gotchas.

Pinout

Display (SPI/FSPI): SCLK 12 · MOSI 11 · MISO 13 · CS 10 · DC 46 · RST –1 · BL 45
Touch (I²C): SDA 16 · SCL 15 · RST 18 · INT 17(nc)
microSD (SPI on the SDIO slot): SCK 38 · MOSI 40 · MISO 39 · CS 47 (DAT1 41 / DAT2 48 held high)
Other: WS2812 RGB → 42 · BOOT → 0 · USB D+/D‑ → 20/19
Broken out & free: IO2, IO3, IO14, IO21 · I²C header 16/15 (shared with touch) · UART header 44/43 (GPS here)

Tested on hardware

Verified on the actual module:

• ✅ Display draws correctly (colours/orientation OK)
• ✅ Capacitive touch — accurate after the baked calibration; menu navigation works
• ✅ Backlight PWM brightness control (Device → Brightness / edge‑hold)
• ✅ Wi‑Fi scan
• ✅ microSD read/write (card must be FAT32)
• ✅ Boots on a powerbank/charger (no USB host) as well as on a PC
• ✅ On‑board RGB LED turned off

Notes for reviewers

• The while(!Serial) change in esp32_marauder.ino is gated on ARDUINO_USB_CDC_ON_BOOT,
  so it only affects native‑USB‑CDC boards; UART‑console boards keep the original behaviour.
• Adding HAS_SEPARATE_SD to the SDInterface guards makes that flag finally reach the
  dedicated‑SPI‑bus path. This also enables it for MARAUDER_CYD_3_5_INCH (which already
  defines HAS_SEPARATE_SD); it looked like the outer guard just missed it, but worth a check
  on that board.
• The board is SDIO‑wired but works fine over SPI once the card is FAT32.

Build (Arduino IDE)

1. Uncomment #define MARAUDER_LCDWIKI_28 in esp32_marauder/configs.h.
2. Copy User_Setup_marauder_lcdwiki_28.h into the TFT_eSPI library and enable it in
   User_Setup_Select.h.
3. Tools → ESP32S3 Dev Module, Flash 16MB, PSRAM OPI PSRAM, USB CDC On Boot: Enabled.