And I agree with you that it sounds rather pointless. I’ve placed some code on Gist. Managed to send “on” to the device, and my little green LED went lighting up like a Christmas tree. Sign up or log in Sign up using Google. Sign up using Email and Password.

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USB DAQ Products Support LibUSB and CDC

Evidence that the circuit works. The original StackOverflow question can be seen here: Device is successfully opened.

Liubsb in windows, libusb cant open the device. Easiest for me was to use the zadig installer see link in the link in the comments above to remove usbser driver and exchange it by the winusb one for this one device.

Beside, I can access CDC device from any terminal program. The composite device is libusbb USB libueb. It turns out that libusb only works with the winUSB-Drivers. Ah, someone else is having the same issue with the terminal as me: Someone mentioned in a random forum thread somewhere else, that unloading the OS drivers by using a utility called kextunload on OS X can help, but I’ve been unable to figure out exactly how to do this.


[SOLVED] Serial communication with USB CDC device (libusb/termios) | Microchip

Essentials Only Full Version. I’m playing around with the following sample I found on http: Stack Overflow works best with JavaScript enabled. Also, when the application exists, my terminal window gets screwed up. Windows successfully enumarete the device.

I think I’ll post a separate StackOverflow question on that shortly. But i can open it in my host application. Email Required, but never shown. Obviously it’s not portable, but it has some nifty functionality and integrates into the app framework event loops. Thank you for your reply.

USB DAQ Products Support LibUSB and CDC

Hi andersm, thanks for replying. I built the project for both windows and linux. Now, option one, using libusb, is failing miserably, as Mac is stingy, and does not want to let go of the USB CDC resource, so I can claim the interface and do stuff with it.

You may be able to use kextunload to remove the OS driver, or make a codeless kext to avoid the device being claimed in the first place, but it seems kind of pointless to create a class-compliant device and still use “raw” packets to communicate with it.


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[SOLVED] Serial communication with USB CDC device (libusb/termios)

I’m trying to manipulate it to send the string “on” to my device: I don’t know why. I’ve just had a minor breakthrough! I use Visual Studio’s compiler. The C program is probably misconfigured for my device, and I’d really like to just be able to send “on” to the device from C. Do you see any characters come cd

A USB-to-serial converter may use the configured baud rate to set the external communication speed, but communication between the host and the device always happens as fast as the device can handle it. Thanks for the hint on IOKit, I’ll definitely look into it, but do want to avoid opening a can of worms that’s going to waste another week of my time.