Add Freenove ESP32 Display 3.5 inch

[agent-nelson]

Adds the Freenove ESP32 Display 3.5 inch
(FNK0103N, also sold as the "Freenove Bitcoin Miner Solo Lottery Miner, ESP32 CYD
3.5 inch"): an ESP32-WROOM-32E "Cheap Yellow Display" style board with a 3.5"
320x480 ST7796 TFT over SPI, XPT2046 resistive touch, microSD slot, RGB LED,
DAC speaker output through an SC8002B amplifier, TP4054 LiPo charger with
battery sense, and UART/I2C/SPI/input headers. The USB-C port goes through a
CH340C, so there is no native USB (no VID/PID; serial REPL and web workflow).

Notes on the board definition:

• board.DISPLAY is a 480x320 BusDisplay (ST7796, 16-bit colour, init
  sequence from the vendor's TFT_eSPI setup) with PWM backlight on GPIO27.
  Rotation 0 is landscape with the USB connector on the left;
  CIRCUITPY_DISPLAY_ROTATION in settings.toml rotates it, as on the Sunton
  boards.
• The SPI clock is 26.67 MHz: the display bus is routed through the GPIO
  matrix, which is the ESP32's full-duplex limit there. (Asking for 40 MHz
  makes busio.SPI raise, and an exception inside board_init() silently
  resets the chip.)
• The XPT2046 touch controller shares the LCD SPI bus (TOUCH_CS,
  TOUCH_IRQ); after displayio.release_displays() the display and the touch
  driver can share board.LCD_SPI().
• The microSD slot and the SPI header share board.SPI() (SD_CS GPIO5, header
  CS GPIO21). board.I2C() is the I2C header (SDA GPIO32, SCL GPIO25).
• RGB LED pins are active low (common anode); the blue element is the status
  LED (MICROPY_HW_LED_STATUS_INVERTED). SPEAKER_ENABLE_INVERTED is the
  amplifier's shutdown pin (pulled up, drive low to enable).

Tested on hardware (11.0.0-alpha.1 at df53dd9 + this commit, ESP-IDF 6.1):

• Boots, correct board id and banner on the CH340 serial console, REPL works,
  1.2 MB CIRCUITPY filesystem created.
• Display: colour bars, labels, 1-px edge markers and the REPL are drawn, and
  pixels read back from the ST7796 GRAM over MISO match what was written;
  CIRCUITPY_DISPLAY_ROTATION round-trips; DISPLAY.brightness sets the
  backlight PWM.
• XPT2046 touch answers on the shared bus (temperature channels, idle X/Y,
  TOUCH_IRQ high while not pressed) after release_displays() and
  re-creating the display on board.LCD_SPI().
• RGB LED pins drive, BOOT button reads high unpressed, IO35/IO39 read,
  battery ADC through the 1:2 divider reads the TP4054 float voltage (4.2 V,
  no cell attached).
• DAC square wave on SPEAKER with SPEAKER_ENABLE_INVERTED low runs.
• board.I2C() scan runs (nothing attached); sdcardio on board.SPI()
  reports "no SD card" with the slot empty.
• Wi-Fi scan lists networks; BLE scan lists devices.
• pre-commit run --all-files and the VID/PID / creator-ID duplicate check pass.

Not yet checked by eye, ear or finger: display orientation and colour order,
touch coordinates under a finger, LED colours and speaker audibility; also
an SD card mount with a card inserted and Wi-Fi station mode. I will follow
up here once those are confirmed.

🤖 Generated with Claude Code

[tannewt]

One ID comment. Please let us know when you've tested it on the device.

[agent-nelson]

Thanks for the review. Freenove already has creator ID 0x1C33_0000 in creationid/creators, so I switched CIRCUITPY_CREATOR_ID to that and opened creationid/creators#95 to register the creation ID 0x0103_0035 for this board (the 0x0103 prefix follows the FNK0103 product code). The 0xF4EE0000 value in the first push was a placeholder, sorry about that.

Pushed as a follow-up commit so the change is visible on its own. I'll follow up separately on the on-device testing.

[tannewt]

Def looks good. Will merge as-is. Feel free to follow up if on device testing shows an issue.