CH340C microcontroller not detected

jed_t · 2026-10-21 01:23:36

Sorry to revive the thread, mine is ESP32-DOWDQ6-V3 and it has a CH340C chip. when I `dmesg -wH` is not detecting the device. when I run `modinfo ch341` it shows ch341. I think this driver is not working for this device. Is there a way to prove my hypothesis?

dimich · 2026-10-21 02:06:08

jed_t wrote:

when I `dmesg -wH` is not detecting the device.

Please show full dmesg output after plugging the device.

jed_t wrote:

when I run `modinfo ch341` it shows ch341.

`modinfo` shows information about a module regardless of any device presence.

jed_t wrote:

I think this driver is not working for this device. Is there a way to prove my hypothesis?

Kernel should™ detect any working USB device regardless of driver.
Show output of

$ lsusb -tv

when device is plugged.

Lone_Wolf · 2026-10-21 14:57:22

Moderator Note
split off from https://bbs.archlinux.org/viewtopic.php?id=285662

jed_t · 2026-10-21 23:49:32

thanks @dimich, I think it's defective because after using another os and pc it is still not detected.

nomorewindows · Yesterday 15:32:55

I think you need to get a driver for ch341 from the AUR.

dimich · Yesterday 21:27:21

nomorewindows wrote:

I think you need to get a driver for ch341 from the AUR.

CH340 and CH341 in UART mode work well with standard in-kernel usb-tty driver.
ch341 drivers from AUR are needed for CH341 in I²C/SPI mode to be recognized as linux I²C/SPI controller.
No special drivers needed for userspace tools (eeprom programmers etc) which access CH341 via libusb.

Last edited by dimich (Yesterday 21:27:55)

Arch Linux

#1 2026-10-21 01:23:36

CH340C microcontroller not detected

#2 2026-10-21 02:06:08

Re: CH340C microcontroller not detected

#3 2026-10-21 14:57:22

Re: CH340C microcontroller not detected

#4 2026-10-21 23:49:32

Re: CH340C microcontroller not detected

#5 Yesterday 15:32:55

Re: CH340C microcontroller not detected

#6 Yesterday 21:27:21

Re: CH340C microcontroller not detected

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