Function libopencm3_sys::usbd_ep_write_packet

pub unsafe extern "C" fn usbd_ep_write_packet(
    usbd_dev: *mut usbd_device, 
    addr: u8, 
    buf: *const c_void, 
    len: u16
) -> u16

Write a packet @param addr EP address (direction is ignored) @param len # of bytes @return 0 if failed, len if successful