tone-generator/soft_twi.hpp

#pragma once

#include <inttypes.h>
#include "util.hpp"

struct SoftTWI {
	
	constexpr SoftTWI::SoftTWI(unsigned sda, unsigned scl)
		: _sda(sda)
		, _scl(scl) {
	}

	unsigned write(const uint8_t*, unsigned);
	void read(uint8_t*, unsigned, bool=false);
	uint8_t read(bool=true);
	bool write(uint8_t);
	void end();
	
	inline bool start_read(uint8_t addr) {
		return start((addr << 1) | 1);
	}

	inline bool start_write(uint8_t addr) {
		return start(addr << 1);
	}
	
private:
	unsigned _sda;
	unsigned _scl;
	
	bool start(uint8_t addr);
};