pub type usbd_hw_ep_write = Option<unsafe extern "C" fn(ep: u8, buf: *const c_void, blen: u16) -> i32>;
Writes data to IN or control endpoint
ep
buf
blen
number of written bytes
pub enum usbd_hw_ep_write { None, Some(unsafe extern "C" fn(u8, *const c_void, u16) -> i32), }
No value.
Some value of type T.
T