M_CAN_FIFO_ID
err = m_can_fifo_write(cdev, 0, M_CAN_FIFO_ID, &fifo_element, 2);
err = m_can_fifo_write(cdev, putidx, M_CAN_FIFO_ID,
err = m_can_fifo_read(cdev, fgi, M_CAN_FIFO_ID, &fifo_header, 2);