CM3-Home technical documentation

Pinout and GPIO allocation

GPIO allocation

GPIO 0  - I2C0 - SDA Mipi Camera
GPIO 1  - I2C0 - SCL Mipi Camera
GPIO 2  - IO1  - Mipi Camera
GPIO 3  - IO0  - Mipi Camera

GPIO 4  - NC
GPIO 5  - NC
GPIO 6  - NC 

GPIO 7  - SPI CE1
GPIO 8  - SPI CE0
GPIO 9  - SPI MISO 
GPIO 10 - SPI MOSI
GPIO 11 - SPI SCLK

GPIO 12 - NC
GPIO 13 - NC

GPIO 14 - TXD0 TP-uart
GPIO 15 - RXD0 TP-uart

GPIO 16 - 1-Wire port

GPIO 17 - NC
GPIO 18 - Display backlight (1=On)
GPIO 19 - NC
GPIO 20 - IR receiver port

GPIO 21 - Left relay
GPIO 22 - Right relay

GPIO 23 - Display RST
GPIO 24 - Display D/C
GPIO 25 - Display IRQ
GPIO 26 - Available GPIO on J3
GPIO 27 - Available GPIO on J3

GPIO 28 - Left Input dry contact (1)
GPIO 29 - Right Input dry contact (2)

GPIO 30 - Light bus Rx
GPIO 31 - Light bus Tx

GPIO 32 - TXD1 Debug port
GPIO 33 - RXD1 Debug port

GPIO 34 - RGB led - Blue  - (0=On)
GPIO 35 - RGB led - Green - (0=On)
GPIO 36 - RGB led - Red   - (0=On)

GPIO 37 - WiFi power-on (1=ON)

GPIO 38 - Yarm reset
GPIO 39 - Yarm 

GPIO 40 - PWM0 OUT - Audio left channel
GPIO 41 - PWM1 OUT - Audio right channel
GPIO 42 - NC
GPIO 43 - NC

GPIO 44 - I2C1 SDA Groove port #1
GPIO 45 - I2C1 SCL Groove port #1

J3 (SPI) Pinout

 1 - 3V3 out
 2 - 3V3 out
 3 - SPI0 CE1          - GPIO 7
 4 - Display backlight - GPIO 18 - (1=On)
 5 - SPI0 CE0          - GPIO 8
 6 - Display reset     - GPIO 23
 7 - SPI0 MOSI         - GPIO 10
 8 - Display D/C       - GPIO 24
 9 - SPI0 MISO         - GPIO 9
10 - Display IRQ       - GPIO 25
11 - Available         - GPIO 26
12 - Available         - GPIO 27
13 - GND               
14 - SPI0 SCLK         - GPIO 11
15 - GND
16 - GND

Serial port allocation

/dev/ttyUSB0 - Left RS485 port
/dev/ttyUSB1 - Yarm serial link
/dev/ttyUSB2 - Right RS485 port
/dev/ttyUSB3 - Serial port interface
/dev/ttyAMA0 - TP-Bus
/dev/ttyS0   - Debug port

Power consumption

CM3-Home technical documentation