Function libopencm3_sys::usbd_register_control_callback

pub unsafe extern "C" fn usbd_register_control_callback(
    usbd_dev: *mut usbd_device, 
    type_: u8, 
    type_mask: u8, 
    callback: usbd_control_callback
) -> c_int

Registers a control callback.

Since the list of user control callbacks is cleared every time device configuration is set (inside usb_standard_set_configuration()), control callback registration must happen inside (or after) the config callback. The specified callback will be called if (type == (bmRequestType & type_mask)). @sa usbd_register_set_config_callback @param type Handled request type @param type_mask Mask to apply before matching request type @return 0 if successful