raspio/lib/revision.js

A raspberry advanced GPIO library for node.js

const fs = require('fs');

function revision() {
  let boardrev = null;

  try {
    const cpuinfo = fs.readFileSync('/proc/cpuinfo', 'ascii', function(err) {
      if (err) throw err;
    });

    cpuinfo.toString().split(/\n/).find(line => {
      const match = line.match(/^Revision.*(.{4})/);
      if (match) {
        boardrev = parseInt(match[1], 16);
      }
      return Boolean(match);
    });

    switch (boardrev) {
      case 0x2:
      case 0x3:
        return "v1rev1";
        break;
      case 0x4:
      case 0x5:
      case 0x6:
      case 0x7:
      case 0x8:
      case 0x9:
      case 0xd:
      case 0xe:
      case 0xf:
        return "v1rev2";
        break;
      case 0x10:
      case 0x12:
      case 0x13:
      case 0x15:
      case 0x92:
      case 0x93:
      case 0xc1:
      case 0x1041:
      case 0x2042:
      case 0x2082:
        return "v2plus";
        break;
      default:
        throw new Error("Unable to determine board revision");
        break;
    }
  } catch (e) {
    return 'v2plus';
  }
}

module.exports = revision();