#define ao_serial_btm_getchar ao_serial2_getchar
#define ao_serial_btm_putchar ao_serial2_putchar
#define _ao_serial_btm_pollchar _ao_serial2_pollchar
#define ao_serial_btm_getchar ao_serial2_getchar
#define ao_serial_btm_putchar ao_serial2_putchar
#define _ao_serial_btm_pollchar _ao_serial2_pollchar