On the Intel Edison Arduino board, the
J18 Arduino connector block TX/RX pins have the UART connected to
/dev/ttyMFD1 in the default Yocto install.
With the Arduino Edison adapter board, these pins are 5V TTL.
However, if you use the Mini-Breakout board for the Edison, the GPIO is 1.8 V, and can be damaged from connecting directly to 3.3 V or 5 V TTL logic. You need a level shifter board to do the interface to non-1.8V logic from the Mini-Breakout board.
Talk to a serial device connected to the Intel Edison UART
SSH into the Edison or connect to the USB debug port and at the Edison shell prompt:
stty -F /dev/ttyMFD1 baud cat /dev/ttyMFD1
where “baud” is your baud e.g. 4800 or 9600 etc.
and you’ll see the text coming in from whatever you’re connected to say a GPS streaming NMEA.
If you’ve installed screen via
opkg install screen
you can connect interactively to your UART device from the Edison shell by
screen /dev/ttyMFD1 baud
Use the Intel Edison UART Serial port programmatically
I would encourage using MRAA + PySerial from Python: