How to use Serial Port from WSL using minicom
Nov 14, 2021 windows-wsl serial-port ubuntu
The COM port number enumerated from Windows is needed in WSL
From Windows Device Manager
Check for “USB Serial Port” under Ports (COM & LTP)
> Ports (COM & LTP)
- USB Serial Port (COM9)
From Windows Powershell
Open Windows Powershell and find the connected Serial port COM number.
This is using the windows hardware class guid: {4d36e978-e325-11ce-bfc1-08002be10318}.
The full list of ClassGuids is available [here]
> $lptAndCom = '{4d36e978-e325-11ce-bfc1-08002be10318}'
> get-wmiobject -Class win32_pnpentity | where ClassGuid -eq $lptAndCom | select name
name
----
USB Serial Port (COM9)
Access serial port from WSL
Add the current user to dialout group
adduser $(whoami) dialout
In our case, the tty corresponding to COM9 in WSL is /dev/ttyS9
Change permission of the tty node:
chmod +X /dev/ttyS9
Install minicom
sudo apt install minicom
Access serial port using minicom
minicom -D /dev/ttyS9
The default port and port settings can be changed in minicom using minicom -s
Please note the port number always changes in Windows when reconnected or connected together with other devices/usb ports. Check this on reconnection.