ESP32-C3 cannot detect if it is connected to USB.

[berkut0]

CircuitPython version

Adafruit CircuitPython 9.1.4
Adafruit CircuitPython 9.2.0-beta.1

Code/REPL

# It was written for rp2040-zero and the code works perfectly.
# But this code doesn't work for esp32-c3 based boards.

import board, supervisor
import neopixel

pixels = neopixel.NeoPixel(board.GP16, 1, auto_write=True)

while True:
    if supervisor.runtime.usb_connected:
        pixels[0] = (0,255,0)
    else:
        pixels[0] = (255,0,0)

Behavior

The LED should be green when the chip is connected via USB and red when the chip is connected to the power supply. In the case of rp2040-zero everything works perfectly, but esp32-c3 gives a false value all the time.

Description

No response

Additional information

No response

[deshipu]

The C3 doesn't have USB support as far as I remember.

[berkut0]

@deshipu But the chip detects the Serial connection perfectly. So far it looks more like a bug.

[deshipu]

How does it detect serial connection?

[berkut0]

@deshipu

if supervisor.runtime.serial_connected:
    pass

[deshipu]

That seems correct to me? Since the board is using an external USB to serial chip, USB is never connected to the microcontroller itself, so the False response is correct.

[berkut0]

ESP32-C3 has a native USB

[deshipu]

Quoting from https://circuitpython.org/board/adafruit_qtpy_esp32c3/

ESP32-C3 is a low-cost microcontroller from Espressif that supports 2.4 GHz Wi-Fi and Bluetooth® Low Energy (Bluetooth LE). It has built-in USB-to-Serial, but not native USB - it cannot act as a keyboard or disk drive. The chip used here has 4MB of Flash memory, 400 KB of SRAM and can easily handle TLS connections.

[berkut0]

@deshipu Aaah, thank you so much! That explains everything.