MQX 3.8.1 usb cdc device not enumerating

[travis_l]

I recently upgraded from MQX 3.8 to 3.8.1 and my usb cdc is not enumerating on my PC anymore.  Previously it all worked fine, but now I cannot see the device enumerate at all.  I am using USBView to see the devices attached to my PC and using 3.8 my device would enumerate properly and load the .inf driver and communicate properly.  Now nothing happens.  I have followed the instructions in the 3.8.1 release notes about adding the library search path and everything builds correctly.  I am wondering what changed to break what was previously working.  I am in the process now of trying this on a KwikStik to determine if it works on a demo board and is not just something to do with my own PCB.

Any information or suggestions would be greatly appreciated!

For reference, I am using:

K40DX256ZVLQ10

MQX 3.8.1

CW 10.2

[travis_l]

Just tried this on my KwikStik and it appears to work, now I just need to find the difference...   ARRRGH!

[travis_l · Accepted solution]

Found it!   The updated demo app has a call to install the usb device driver right before calling USB_Class_CDC_Init()

if (MQX_OK != _usb_device_driver_install(USBCFG_DEFAULT_DEVICE_CONTROLLER))

{

  printf("Driver could not be installed\n");

  return;

}

I missed any mention of this in the release notes but it appears to be working now.