RTX custom class example

I'm looking for a USB device custom class example for the LPC17xx. There's plenty of examples for HID, CDC & memory, but nothing for custom classes.

I have added usbd_cls.c (usbd_cls_ep_req etc) and my own USBD_ConfigDescriptor to override the usb_lib.c definition.

It's not working, so I must be missing something else.

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