ao_exti_setup (uint8_t port, uint8_t pin, uint8_t mode, void (*callback)(void)) {
uint8_t id = pin_id(port,pin);
uint8_t pint;
ao_exti_setup (uint8_t port, uint8_t pin, uint8_t mode, void (*callback)(void)) {
uint8_t id = pin_id(port,pin);
uint8_t pint;