mraa/examples/javascript/bmp85.js

#!/usr/bin/env node

/*
 * Author: Brendan Le Foll <brendan.le.foll@intel.com>
 * Copyright (c) 2014 Intel Corporation.
 *
 * SPDX-License-Identifier: MIT
 */

"use strict";

const mraa = require('mraa'); //require mraa

let i2cDevice = new mraa.I2c(0);
i2cDevice.address(0x77);

// initialise device
if (i2cDevice.readReg(0xd0) != 0x55) {
    console.log("error");
}

// we want to read temperature so write 0x2e into control reg
i2cDevice.writeReg(0xf4, 0x2e);

// read a 16bit reg, obviously it's uncalibrated so mostly a useless value :)
console.log(i2cDevice.readWordReg(0xf6));

// and we can do the same thing with the read()/write() calls if we wished
// thought I'd really not recommend it!
let buf = new Buffer(2);
buf[0] = 0xf4;
buf[1] = 0x2e;
console.log(buf.toString('hex'));
i2cDevice.write(buf);

i2cDevice.writeByte(0xf6);
let result = i2cDevice.read(2);
console.log(result.toString('hex'));