+char
+ao_serial1_getchar(void);
+
+void
+ao_serial1_putchar(char c);
+
+char
+ao_serial1_pollchar(void);
+
+void
+ao_serial1_set_speed(uint8_t speed);
+
+char
+ao_serial2_getchar(void);
+
+void
+ao_serial2_putchar(char c);
+
+char
+ao_serial2_pollchar(void);
+
+void
+ao_serial2_set_speed(uint8_t speed);
+
+char
+ao_serial3_getchar(void);
+
+void
+ao_serial3_putchar(char c);
+
+char
+ao_serial3_pollchar(void);
+
+void
+ao_serial3_set_speed(uint8_t speed);
+
+extern uint32_t ao_radio_cal;
+
+void
+ao_adc_init();
+