MeshCore/variants/wio-tracker-l2

MeshCore for Seeed Wio Tracker L2 Pro

MeshCore port for the Seeed Studio Wio Tracker L2 Pro (pre-release hardware; pin map may change on production units).

Hardware

Component	Detail
MCU module	Wio-S3: ESP32-S3, 16 MB flash (QIO), 8 MB PSRAM (OPI)
LoRa	SX1262, 862-930 MHz (SCK 4, MISO 5, MOSI 6, CS 21, RST 7, BUSY 8, DIO1 9, DIO2 = RF switch, TCXO 1.8 V)
GNSS	Quectel L76K (GPS/BeiDou/GLONASS/QZSS), UART: module TX to GPIO 18, module RX from GPIO 17, 9600 baud
Display	3.2" 320x240 NV3031B on quad-SPI (SCLK 42, IO0-3 = 41/40/39/38, CS 46), 75 MHz
Touch	GT911 capacitive, I2C 0x5D
Backlight	LP5814 LED driver, I2C 0x2C
I/O expander	TCA9535, I2C 0x21 - gates power/reset for GNSS, LCD, touch, SD, speaker amp, battery ADC, Grove
Battery ADC	ADS1115, I2C 0x48, AIN0 through x2 divider
USB-C detect	AW35615 CC controller, I2C 0x22 (charge detection)
Audio	ES8311 codec (speaker, alert tones) + ES7243E mic ADC (unused) on I2S
I2C bus	SDA 47, SCL 48
Buttons	User/Boot = GPIO 0; Wake/lock button on expander P00
SD card	SDIO 1-bit: CLK 2, CMD 3, D0 1 - offline map tiles, logs

Firmware flavors

Env	What it does
Wio_Tracker_L2_companion_radio_ble	Phone companion. Standard display UI, MeshCore app over BLE (pairing PIN 123456), on-screen Bluetooth toggle page.
Wio_Tracker_L2_companion_radio_usb	Standard display companion over USB-C serial.
Wio_Tracker_L2_repeater	Standalone mesh repeater.
Wio_Tracker_L2_room_server	Standalone room/BBS server.

Build & flash

# from the MeshCore repo root
pio run -e Wio_Tracker_L2_companion_radio_ble

# bootloader mode if needed: hold User/Boot, tap RST, release - then:
pio run -e Wio_Tracker_L2_companion_radio_ble -t upload

The board enumerates as a native USB-CDC port (auto-reset via 1200-bps touch is enabled). For the BLE companion build, pair from the MeshCore app with the PIN shown on the device screen.

Port notes

• Everything hangs off the TCA9535 expander. WioTrackerL2Board::begin() replays Seeed's power-up sequence; order and delays matter (especially the 500 ms LCD reset settle). If the expander probe fails, the firmware still runs but GPS/display/battery reads are dead.
• Battery is read via the ADS1115 at +/-4.096 V FSR and mapped through a LiPo discharge curve.
• GNSS: GPS+BeiDou+GLONASS are enabled at start ($PCAS04,7). A watchdog resets the module if it tracks 4+ strong satellites for minutes without producing a fix. Raw NMEA can be logged to SD for diagnosis. The GNSS rail starts off. The board-local provider powers it only while GPS is enabled, including scheduled wake periods, and releases the UART pads before cutting power so they cannot back-power the receiver.
• Power: CPU drops to 80 MHz while the screen sleeps; the speaker amp and I2S clocks run only while a tone plays; the GNSS and Grove rails are gated; idle Bluetooth switches to slow advertising.
• Display orientation: offset_rotation=1 (landscape). If a unit shows the UI upside-down, use 3 in WioTrackerL2Display.h.
• Pin map follows Seeed's Wio Tracker L2 firmware and display support work. These pre-release assignments remain subject to hardware revision changes.