samd : If you disconnect USBCDC after communication is established, it will cause an infinite loop.

[sago35]

I thought usbLineInfo.lineState would return to 0 after disconnecting communication, but it did not.
Even when it returns to 0, USBCDC.WriteByte() will go into an infinite loop depending on the timing of the disconnect.

• atsamd2x: improve USBCDC #1636
• atsamd5x: improve USBCDC #1481

We will discuss how to fix it.
A simple solution would be to stop sending if it takes more than Xmsec to send a single message.

[sago35]

If the connection is never established, or never disconnected, there is no problem.

[deadprogram]

This has been released with v0.17.0 so now closing. Thanks!