tone-generator/port.hpp

#pragma once

#include "util.hpp"

namespace port {
	struct Drain {
		uint8_t mask;
		volatile uint8_t* mode;
		volatile uint8_t* in;
	
		inline Drain(unsigned pin) AW_IN {
			mask = digitalPinToBitMask(pin);
			mode = portModeRegister(digitalPinToPort(pin));
			in = portInputRegister(digitalPinToPort(pin));
		}

		inline void set(uint8_t b) AW_IN {
			if(b) {
				*mode &= ~mask;
			} else {
				*mode |= mask;
			}
		}
	
		inline uint8_t get() AW_IN {
			return *in & mask;
		}
	};
	
	struct Input {
		uint8_t mask;
		volatile uint8_t* in;
	
		inline Input(unsigned pin) AW_IN {
			mask = digitalPinToBitMask(pin);
			in = portInputRegister(digitalPinToPort(pin));
		}
	
		inline uint8_t get() AW_IN {
			return *in & mask;
		}
	};
	
	struct Output {
		uint8_t mask;
		volatile uint8_t* out;
	
		inline Output(unsigned pin) AW_IN {
			mask = digitalPinToBitMask(pin);
			out = portOutputRegister(digitalPinToPort(pin));
		}
		
		inline void set(uint8_t b) AW_IN {
			if(b) {
				*out |= mask;
			} else {
				*out &= ~mask;
			}
		}
	};
};