function serialportlist is not working

When I use the function 'serialportlist' to identify the serial ports on my laptop i get a 1x0 empty string array.

ports=serialportlist

ports = 

  1×0 empty string array

I think, I should get at least 2 ports, because I have 2 USB ports on my laptop.

Im using matlab 2019b.

Do i need to instal some packages for using serialportlist?

[Walter Roberson]

USB by itself is not enough: you would need to have a connected device that is responding as offering a virtual com port.

Answer 1

[Stijn Haenen]

I do not know if i have such a device. I want to play audio files via different USB speakers, do you have any tips how to do this?

[Walter Roberson]

USB speakers would not advertise themselves as offering virtual com port services so using serialport() would not be appropriate.

See https://www.mathworks.com/help/audio/ref/audioplayerrecorder.getaudiodevices.html