Type Definition flipperzero_sys::usbd_ctl_callback

pub type usbd_ctl_callback = Option<unsafe extern "C" fn(dev: *mut usbd_device, req: *mut usbd_ctlreq, callback: *mut usbd_rqc_callback) -> usbd_respond>;

USB control callback function.

Uses for the control request processing. Some requests will be handled by core if callback don’t process it (returns FALSE).

• If request was not processed STALL PID will be issued.
• GET_CONFIGURATION
• SET_CONFIGURATION (passes to [usbd_cfg_callback)]
• GET_DESCRIPTOR (passes to [usbd_dsc_callback)]
• GET_STATUS
• SET_FEATURE, CLEAR_FEATURE (endpoints only)
• SET_ADDRESS

Returns:

• usbd_respond status.

Arguments

• dev - [Direction: In] points to USB device
• req - [Direction: In] points to usb control request
• *callback - [Direction: In, Out] USB control transfer completion callback, default is NULL (no callback)