| GPIO | Function | Direction | Evidence |
|---|---|---|---|
| 0 | I2C SCL | Bidir (OD) | Wire.begin(sda=20, scl=0, freq=400000) in sub_42004146 |
| 1 | Button ADC (primary) | Analog In | analogRead(1) in sub_42006294 — 4-button resistor ladder |
| 2 | Button ADC (secondary) | Analog In | analogRead(2) fallback in sub_42006294 — 2 buttons |
| 3 | Power/Wake input | Digital In | digitalRead(3) in sub_4200D0B6, triggers power-on sequence |
Serge Baranov CrazyCoder
CrazyCoder
/ X3-GPIO.md
Last active
April 20, 2026 17:17
Xteink X3 GPIO (based on 5.0.3 firmware analysis)
| Property | Value | Evidence |
|---|---|---|
| Controller | SSD1677 | Command set, LUT format (5x42 bytes), register layout |
| Diagonal | 3.68" | Alibaba listing + mechanical drawing; sqrt(51.84² + 77.76²) = 93.5mm = 3.68" |
| Buffer resolution | 792 x 528 | Constructor param, buffer size = 52,272 bytes (99 bytes/row x 528 rows) |
| Hardware resolution | 792 x 600 | CMD 0x61 data: [0x03, 0x18, 0x02, 0x58] → (0x0318=792) x (0x0258=600) |
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