Memory-management functions
- usbd_alloc()
- Allocate memory area to use for data transfers.
- usbd_free()
- Free memory allocated by usbd_alloc().
- usbd_mphys()
- Get the physical address of memory allocated by usbd_alloc().
- usbd_alloc_urb()
- Allocate a USB Request Block for subsequent URB-based operations.
- usbd_free_urb()
- Free the URB allocated by usbd_alloc_urb().