USB Troubleshooting

Summary

If devices are not shown in the app it can be an issue of the Android device or the USB device or a combination of both.

Automic start of this App and automatic driver selection is only supported for the well known USB VID/PIDs compiled into the app. For other devices (e.g. exotic CDC devices like Digispark) you can select the driver in the 'USB devices' tab.

Android issues

Some vendors do not enable USB host mode on some devices (e.g. Samsung S3 Neo).

You can try rooting or installing an alternative firmware.

If your device is rooted, you can try adjusting files in /system/etc/permissions manually or with one of the various USB OTG checker apps.

USB issues

I have a PL2302 that works without issues on one Android device, but on another it has connection issues in most cases. With adb shell dmesg I get:

  [81152.699037] c0 usb 2-1: new full speed USB device number 31 using s5p-ohci
  [81152.894098] c0 usb 2-1: device descriptor read/all, error -62
  ...
  [81154.109078] c0 hub 2-0:1.0: unable to enumerate USB device on port 1