{"id":4269,"date":"2021-12-25T05:53:53","date_gmt":"2021-12-25T04:53:53","guid":{"rendered":"https:\/\/www.pschatzmann.ch\/home\/?p=4269"},"modified":"2024-08-18T05:16:54","modified_gmt":"2024-08-18T03:16:54","slug":"microcontrollers-and-midi","status":"publish","type":"post","link":"https:\/\/www.pschatzmann.ch\/home\/2021\/12\/25\/microcontrollers-and-midi\/","title":{"rendered":"Microcontrollers and Apple MIDI"},"content":{"rendered":"

My Arduino MIDI Library<\/a> is using Arduino Streams as a basic design feature and therefore it supports Bluetooth, TCP\/IP and UDP.<\/p>\n

I am usually programming on an old Macbook<\/strong>, so I was wondering if I can extend my library to support Apple MIDI<\/a> as well.<\/p>\n

After some research I found that Apple MIDI communicates on 2 UDP ports: one for the session management and the other for the midi data. I wanted to avoid me having to implement the protocol myself and found the C implementation from Thorsten Klose<\/strong> which provides a quite nice abstraction layer: All I needed to do was to implemeent my C++ class which provides the necessary callback methods and integrates into my MIDI parser.<\/p>\n

Arduino Sketch<\/h3>\n

Here is the example sketch which uses the new functionality:<\/p>\n

#include <WiFi.h>\n#include \"Midi.h\"\n\nMidiCallbackAction action;\nAppleMidiServer apple(&action);\n\nconst char *SSID = \"your ssid\";\nconst char *PWD = \"your password\";\n\nvoid onNoteOn(uint8_t channel, uint8_t note, uint8_t velocity) {\n  Serial.print(\"onNoteOn: \");\n  Serial.println(note);\n}\n\nvoid onNoteOff(uint8_t channel, uint8_t note, uint8_t velocity) {\n  Serial.print(\"onNoteOff: \");\n  Serial.println(note);\n}\n\nvoid setupWIFI() {\n  Serial.begin(119200);\n  MidiLogLevel = MidiInfo;\n\n  WiFi.begin(SSID, PWD);\n  while (WiFi.status() != WL_CONNECTED) {\n    Serial.print('.');\n    delay(1000);\n  }\n\n  Serial.print(\"Connected to IP address: \");\n  Serial.println(WiFi.localIP());\n}\n\nvoid setup() {\n  action.setCallbacks(onNoteOn, onNoteOff);\n  setupWIFI();\n  apple.begin(5004);\n}\n\nvoid loop() {\n  if (!apple.loop()){\n    delay(10);\n  }\n}\n\n<\/code><\/pre>\n
As you can see, by using the AppleMidiServer class<\/a> we use the same concepts that we already know from in all other examples and because this is a server class, we can not only receive MIDI messages, but also produce them.<\/p>\n
Dependencies<\/h3>\n