usb_cdc_line_coding_t
usb_cdc_line_coding_t lc;
usbsacm_set_line_coding(usbsacm_port_t *acm_port, usb_cdc_line_coding_t *lc)
*((usb_cdc_line_coding_t *)bp->b_wptr) = *lc;
usb_cdc_line_coding_t *);
usb_cdc_line_coding_t acm_line_coding; /* port line coding */