+void
+start(void);
+
+char
+ao_serial6_getchar(void);
+
+void
+ao_serial6_putchar(char c);
+
+int
+_ao_serial6_pollchar(void);
+
+uint8_t
+_ao_serial6_sleep_for(uint16_t timeout);
+
+void
+ao_serial6_set_speed(uint32_t speed);
+
+void
+ao_serial6_drain(void);