On Thu, Sep 28, 2017 at 07:39:58PM +0200, tu...@posteo.de wrote: > The interesting thing is: I have a pololu avr programmer (v20, an > ISP-programmer it is), which uses also /dev/ttyACM<n>...and that > one works fine. I plugged it in simultanously to ensure all drivers > get loaded...and then I plugged in the Digispark...and udec does > nothing. > > Or do I misinterpret here something? Multiple different drivers may create /dev/ttyACM<n> nodes for devices.
For example, on my system I have multiple /dev/ttyUSB<n> nodes. Some of them are created by cdc_ether driver, that's my LTE modem. When I plug in a popular arduino clone that uses ch341 usb chip, it needs a different driver called ch341. You probably need to build your kernel with CONFIG_USB_ACM compiled in or enabled as a module. -- mlen
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