'use strict';

const i2c = require('../');

const MCP9808_ADDR = 0x18;
const TEMP_REG = 0x05;

const toCelsius = rawData => {
  rawData = (rawData >> 8) + ((rawData & 0xff) << 8);
  let celsius = (rawData & 0x0fff) / 16;
  if (rawData & 0x1000) {
    celsius -= 256;
  }
  return celsius;
};

const i2c1 = i2c.open(1, err => {
  if (err) {
    throw err;
  }

  i2c1.readWord(MCP9808_ADDR, TEMP_REG, (err, rawData) => {
    if (err) {
      throw err;
    }

    console.log(toCelsius(rawData));

    i2c1.close(err => {
      if (err) {
        throw err;
      }
    });
  });
});