ble_midi module need help implementing new functions

[espruino-discuss]

Posted at 2023-04-28 by user155285

Hi all,
I am trying to implement 2 functions to this module. One to receive CC messages and one to rename the device. I am pretty limited in my knowledge when it comes to this subject.
If anyone can help it will be greatly appreciated!

thank you!

this is where I am at, and both function doesn't work for now 😎:

/* Copyright (c) 2017 Gordon Williams, George Mandis, Joe Bowbeer, Pur3 Ltd. See the file LICENSE for copying permission. */
/* usage:
var midi = require("ble_midi");
midi.init();

midi.send(channel, controller, value);
*/

/// Turns the device into a MIDI controller
exports.init = function () {
  NRF.setServices({
    "03B80E5A-EDE8-4B33-A751-6CE34EC4C700": {
      // MIDI
      "7772E5DB-3868-4112-A1A9-F2669D106BF3": {
        readable: true,
        writable: true,
        notify: true,
        value: [0x80, 0x80, 0x00, 0x00, 0x00],
        onWrite: function (evt) {
          if (
            evt.data.length == 6 &&
            evt.data[0] == 0x80 &&
            evt.data[1] == 0x80 &&
            (evt.data[2] & 0xf0) == 0xb0
          ) {
            var timestamp = ((evt.data[0] & 0x3f) << 7) | (evt.data[1] & 0x7f);
            var channel = evt.data[2] & 0x0f;
            var controller = evt.data[3];
            var value = evt.data[4];
            exports.onCC(timestamp, channel, controller, value);
          }
        }
      }
    }
  });

  NRF.setAdvertising([
    // Flags: LE Limited Discoverable Mode, BR/EDR Not Supported
    0x02, 0x01, 0x05,
    // Complete Local Name: PuckCC
    0x07, 0x09, 0x50, 0x75, 0x63, 0x6b, 0x43, 0x43,
    // MIDI
    0x11, 0x06, 0x00, 0xc7, 0xc4, 0x4e, 0xe3, 0x6c, 0x51, 0xa7, 0x33, 0x4b,
    0xe8, 0xed, 0x5a, 0x0e, 0xb8, 0x03,
  ]);
};

/// Sends a raw MIDI command
exports.cmd = function (cmd, d1, d2) {
  NRF.updateServices({
    "03B80E5A-EDE8-4B33-A751-6CE34EC4C700": {
      "7772E5DB-3868-4112-A1A9-F2669D106BF3": {
        value: [0x80, 0x80, cmd, d1, d2],
        notify: true,
      },
    },
  });
};

/// Send a 'control change' (0xB0) MIDI command
exports.send = function (channel, controller, value) {
  this.cmd(0xb0 + channel, controller, value);
};
/// Send a 'note on' (0x90) MIDI command
exports.noteOn = function (channel, note, velocity) {
  this.cmd(0x90 + channel, note, velocity);
};
/// Send a 'note off' (0x80) MIDI command
exports.noteOff = function (channel, note, velocity) {
  this.cmd(0x80 + channel, note, velocity);
};

/// Sets the name of the MIDI device
exports.setName = function (name) {
  var nameBytes = [];
  for (var i = 0; i < name.length; ++i) nameBytes.push(name.charCodeAt(i));
  NRF.setAdvertising([
    // Flags: LE Limited Discoverable Mode, BR/EDR Not Supported
    0x02,
    0x01,
    0x05,
    // Complete Local Name
    0x07,
    0x09,
    nameBytes,
    // MIDI
    0x11,
    0x06,
    0x00,
    0xc7,
    0xc4,
    0x4e,
    0xe3,
    0x6c,
    0x51,
    0xa7,
    0x33,
    0x4b,
    0xe8,
    0xed,
    0x5a,
    0x0e,
    0xb8,
    0x03,
  ]);
};

[espruino-discuss]

Posted at 2023-05-02 by @gfwilliams

Hi - did you close this because you figured it out?

Or is this another bit of code from ChatGPT? :)

---

Posted at 2023-05-02 by user155285

😂
ahaha no!
resolved with the help of Joe Bowbeer <3

full discussion and solution:
joebowbeer/PuckCC#1 (comment)

---

Posted at 2023-05-02 by @gfwilliams

Great! Actually Joe dropped me an email (I'll get back to you soon Joe!) so maybe we can get it built into a module