Wiring

Overview

USB-C (5V) ──────────────────────────────► RPi Zero 2W
                                               │
                          GPIO ◄───────────── Buttons (×7)
                          SPI  ──────────────► GDEM0397T81P (3.3V)

SPI — Display

The GDEM0397T81P communicates with the Pi over SPI at 3.3V logic.

Signal	Pi pin	Notes
MOSI	GPIO 10 (SPI0 MOSI)	Data to display
SCLK	GPIO 11 (SPI0 SCLK)	Clock
CS	GPIO 8 (SPI0 CE0)	Chip select
DC	TBD	Data/Command select
RST	TBD	Hardware reset
BUSY	TBD	Panel busy signal

note

Exact pin assignments are defined in the C SPI driver in the runtime repository.

GPIO — Buttons

Seven buttons are wired to GPIO pins with pull-up or pull-down resistors. The logical mapping is owned by the runtime repo.

Power

The Pi is powered via its USB-C port. The battery connects directly without a power management IC in the current revision.