#ifndef SOFTI2C_H
#define SOFTI2C_H

#include <Arduino.h>

class SoftI2C {
private:
  uint8_t sda_pin;
  uint8_t scl_pin;
  uint32_t delay_us;
  
  void sda_low() { digitalWrite(sda_pin, LOW); }
  void sda_high() { digitalWrite(sda_pin, HIGH); }
  void scl_low() { digitalWrite(scl_pin, LOW); }
  void scl_high() { digitalWrite(scl_pin, HIGH); }
  bool read_sda() { return digitalRead(sda_pin); }
  
  void i2c_delay() { delayMicroseconds(delay_us); }
  
  void start_condition();
  void stop_condition();
  bool write_byte(uint8_t data);
  uint8_t read_byte(bool ack);
  bool send_ack();
  void send_nack();
  
public:
  SoftI2C(uint8_t sda, uint8_t scl, uint32_t freq = 100000);
  
  void begin();
  void end();
  
  bool begin_transmission(uint8_t addr);
  bool write(uint8_t data);
  bool end_transmission();
  uint8_t request_from(uint8_t addr, uint8_t count);
  uint8_t read();
  bool available();
};

#endif