i2c.h

#pragma once
// Credit: https://github.com/NaejEL/flipperzero-i2ctools

#include <furi.h>
#include <furi_hal.h>
#include <stdint.h>

#define SCL gpio_ext_pc0
#define SDA gpio_ext_pc1

#define I2C_BUS &furi_hal_i2c_handle_external
#define I2C_TIMEOUT 10

#define MAX_MESSAGE_SIZE 128
#define MAX_RECORDS 128

struct I2C {
	enum class BusState {Free, Started};

	struct Frame {
		uint8_t data[MAX_MESSAGE_SIZE];
		bool ack[MAX_MESSAGE_SIZE];
		uint8_t bitIndex;
		uint8_t dataIndex;
	};

	bool started = false;
	bool first = true;
	BusState state = BusState::Free;
	Frame frames[MAX_RECORDS];
	uint8_t frameIndex = 0;
	uint8_t menuIndex = 0;
	uint8_t rowIndex = 0;
	uint8_t address = 0;

	I2C(uint8_t address_);
	~I2C();

	void clearBuffers();
	void startInterrupts();

	bool write(const uint8_t *data, uint8_t size);
	bool read(uint8_t *buffer, uint8_t size);
	bool writeThenRead(const uint8_t *tx_data, uint8_t tx_size, uint8_t *rx_data, uint8_t rx_size);

	bool readReg8(uint8_t reg_addr, uint8_t &out);
	bool readReg16(uint8_t reg_addr, uint16_t &out);
	bool writeReg8(uint8_t reg_addr, uint8_t data);
	bool writeReg16(uint8_t reg_addr, uint16_t data);
	
	void acquire();
	void release();

	static int count;
	static void stopInterrupts();
};