COM ports

Reading from USB COM port in go

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If you want an easy copy and paste, no nonsense way to print the output of a COM PORT to the terminal in go, then have a look at the code at the bottom of this post.

Firstly, the go.bug.st/serial/enumerator package provides a very nice interface for getting details of connected devices, and includes more details than the example code in go.bug.st/serial that I found first time around.

Thanks to the toit devs for being responsive and helping me quickly figure out how I could make my ESP spit some USB content out over the COM port.

The code

In a nutshell is this:

  • Loops forever
  • Targets a specific device ID, such a 1a86:7523
  • Waits for it to appear as connected
    • Uses baud rate 115200
    • Opens the port
    • Prints all output received to the console

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WSL2 COM port pass-through with usbipd (firewall issues)

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I’ll start by saying that ultimately you want to read and follow the Connecting USB devices documentation for WSL.

However, a few things cropped up along the way that I think might be worth writing down for future me, and others.

Requirements

Firstly, you need to be on WSL2.

Next, install the USBIPD-WIN program.

winget install --interactive --exact dorssel.usbipd-winCode language: CSS (css)

Listing devices

In windows cmd or powershell, you can use usbipd list to list all devices. This should line up with what you see in Windows device manager if you open it.

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