BPI-M2+ UART

UART schematic diagram:

BPI-M2+ support 4 UART port

UART0 debug port UART1 connect BT module UART2 extend serial port UART3 traditional serial port

use minicom to test UART:

sudo apt-get install minicom 
sudo minicom -s

test /dev/ttyS0、/dev/ttyS2、/dev/ttyS3 loopback success

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