time_temperature_display/include/i2c_bus.h

#pragma once

#include <Arduino.h>
#include <Wire.h>

#include "config.h"

// The PCF85063 RTC and the SHTC3 sensor share one bus. Both drivers call this;
// only the first call does any work.
inline bool i2cBusBegin()
{
  static bool started = false;
  if (!started) {
    started = Wire.begin(I2C_SDA_PIN, I2C_SCL_PIN, I2C_FREQ_HZ);
  }
  return started;
}

// True if a device acknowledges its address.
inline bool i2cDevicePresent(uint8_t addr)
{
  Wire.beginTransmission(addr);
  return Wire.endTransmission() == 0;
}