Banana Pi BPI-M3 40-pin GPIO
Banana Pi BPI-M3 has a 40-pin GPIO header that matches that of the Model B+ Raspberry Pi. Following is the Banana Pi GPIO Pinout:
NOTE:GPIO port 2 4 , support input and output , you can use 5V power to BPI-M3 with GPIO port
CSI Camera Connector specification:
CSI Camera Connector
The CSI Camera Connector is a 40-pin FPC connector which can connect external camera module with proper signal pin mappings. The pin definitions of the CSI interface are shown as below. This is marked on the Banana Pi board as “CSI”.
MIPI DSI (Display Serial Interface)
The display Connector is a 40-pin FPC connector which can connect external LCD panel (MIPI DSI) and touch screen (I2C) module as well. The pin definitions of this connector are shown as below. This is marked on the Banana Pi board as “DSI”.
The header CON4 is the UART interface. For developers of Banana Pi, this is an easy way to get the UART console output to check the system status and log message.
more ,please see BPI-M3 schematic diagram: