Index of values

bus_of_usb_bus b

Test if a value, opaque in Ocaml, is NULL in C

open_dev dev

usb_bulk_read handle ep size timeout, differently from libusb, this function doesn't take the buffer as an input parameter but as an output parameter.

usb_control_msg handle requesttype request value index size timeout, differently from libusb, this function doesn't take the buffer as an input parameter but as an output parameter.

In the C version this function can return NULL, in Ocaml, since it is opaque, you can testif it is null using the function Usb.is_null