Serge Baranov CrazyCoder

Xteink X3 GPIO Pin Mapping

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

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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