'use strict';

// When run, this program will output the same information as the
// command 'i2cdetect -y -q 1'
// An error message will be printed on the BeagleBone as it doesn't
// support the SMBus quick command.
// This program is similar to i2cdetect.js, but it uses writeQuickSync
// rather than receiveByteSync to detect devices.
const fs = require('fs');
const i2c = require('../');
const i2c1 = i2c.openSync(1);

const EBUSY = 16; /* Device or resource busy */

const scan = (first, last) => {
  fs.writeSync(0, '     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f');

  for (let addr = 0; addr <= 127; addr += 1) {
    if (addr % 16 === 0) {
      fs.writeSync(0, '\n' + (addr === 0 ? '0' : ''));
      fs.writeSync(0, addr.toString(16) + ':');
    }

    if (addr < first || addr > last) {
      fs.writeSync(0, '   ');
    } else {
      try {
        i2c1.writeQuickSync(addr, 0);
        fs.writeSync(0, ' ' + addr.toString(16)); // device found, print addr
      } catch (e) {
        if (e.errno === EBUSY) {
          fs.writeSync(0, ' UU');
        } else {
          fs.writeSync(0, ' --');
        }
      }
    }
  }

  fs.writeSync(0, '\n');
};

if (!i2c1.i2cFuncsSync().smbusQuick) {
  console.log('Error: Can\'t use SMBus Quick Write command on this bus#');
} else {
  scan(0x3, 0x77);
}