CTRL+D (\x04) doesn't work on usb_cdc.serials[1]

[ismael-miguel]

Firmware

Adafruit CircuitPython 6.2.0-beta.3 on 2021-03-04; Raspberry Pi Pico with rp2040

Behavior

On usb_cdc.serials[0], receiving a CTRL+D (\x04) control character causes the board to reset.
On usb_cdc.serials[1], nothing happens.

Additional Info

Was just expecting the board to reset, as sending a CTRL+D (\x04) over usb_cdc.serials[0] has that behaviour.
Maybe nothing happens because the REPL doesn't read that channel, and the REPL is what controls the reset?

[FoamyGuy]

I think this is the intended behavior. The new CDC "channel" does not have any special use for ctrl+d and ctrl+c. That way if your application requires to use them for something else then it won't get interrupted by circuitpython things.

[dhalbert]

That's correct, and there is no way to indicate an "end of file" on the channel. All data is passed both ways unimpeded. Think of it as a UART channel over USB.