Interfacing - jvandewiel/no-alexa GitHub Wiki

There are a couple of test-points on the MLB that we can connect to. The following have been identified

UART0

Testpads TM44/TM45 TM45: RX TM44: TX

1st boot: 115200 baudrate, then switch to 921600 baudrate

Serial USB colors Green: TX White: RX

USB

Testpads TM4/TM5 TM4: to D+ of host cable TM5: to D- of host cable

USB cable colors Red +5V White D- Green D+ Black GND

Note that it looks like the dot is only exposed as a USB-device when booting into fastboot mode.

I2C

Testpads TM7/TM10 TM10: SCL (clock) TM7: SDA (data)

There is an init process that sets the addresses for the I2C things on the bus. The folllowing ID's and function have been found