#define ao_gps_getchar ao_serial3_getchar
#define ao_gps_putchar ao_serial3_putchar
#define ao_gps_set_speed ao_serial3_set_speed
#define ao_gps_getchar ao_serial3_getchar
#define ao_gps_putchar ao_serial3_putchar
#define ao_gps_set_speed ao_serial3_set_speed