Even the wch_usb_start output is not shown every time. I got it working once, but after that no luck. The driver is correctly installed and the kext is loaded.ĭmesg output suggests that the driver is at least doing something, once I plug a board in:ġ 0 wch_usb: configDMM – find the config interface numbers I tried this for hours but I can’t get it to work. If you have problems with the driver using the latest OSX High Sierra please refer to the KB Article: Easiest way is the terminal here: sudo cp /Library/Extensions/usbserial.kext /System/Library/Extensions You can try copying the usbserial kext to the folder /System/Library/Extensions.

Little hint that Altais posted in the comments if it does not work correctly. Until it is available on the Winchiphead Website you can download the driver package here (Updated ): Now it should be possible to use Arduino’s equipped with that without any problems under Mac OS 10.9 to mac OS 10.13 (High Sierra).įor High Sierra you must allow the driver to load in the Security & Privacy Settings you will be asked for it once you plug in a device with this serial chip, Thanks to Robin for this info.

I just received a signed driver by Winchiphead for their USB Serial bridge CH340.