pub struct BcmMsgHead {
    _opcode: u32,
    _flags: u32,
    /// number of frames to send before changing interval
    _count: u32,
    /// interval for the first count frames
    _ival1: BcmTimeval,
    /// interval for the following frames
    _ival2: BcmTimeval,
    _can_id: u32,
    /// number of can frames appended to the message head
    _nframes: u32,
    /// buffer of CAN frames
     _frames: [CanFrame; 0],
}

impl BcmMsgHead {
    #[inline]
    pub fn frames(&self) -> &[CanFrame] {
        return unsafe {
            slice::from_raw_parts(self._frames.as_ptr(), self._nframes as usize)
        };
    }
}