OSC2MIDI/OSC2MidiGateway.ino

// .../Arduino/hardware/espressif/esp32/cores/esp32/HardwareSerial.cpp:
/*
  #ifndef RX1
  #define RX1 35
  #endif

  #ifndef TX1
  #define TX1 34
  #endif
*/

#define DEBUG 1
#define AP_TRIGGER_PIN 15
#define AP_TIMEOUT 120
#define AP_NAME "OSC2MidiBridge"

#include "debug.h"
#include <Arduino.h>
//#include <ESP8266WiFi.h>
#include <WiFiManager.h>
#include <WiFiUdp.h>
#include <OSCMessage.h>
#include <OSCBundle.h>
#include <OSCData.h>
#include <MIDI.h>
#include "OSC2Midi.h"
#include <HardwareSerial.h>

void OSCToMidiCC(OSCMessage &msg, int offset);
void MidiCCToOSC(uint8_t channel, uint8_t number, uint8_t value);

WiFiUDP udp;
IPAddress clientIP; // store client IP for feedback

/*
   UART    RX IO   TX IO   CTS   RTS
   UART0   GPIO3   GPIO1   N/A   N/A
   UART1   GPIO9   GPIO10  GPIO6   GPIO11
   UART2   GPIO16  GPIO17  GPIO8   GPIO7
*/

HardwareSerial midi1(2); // RX: 16, TX: 17
HardwareSerial midi2(1); // RX: 35, TX: 34 (changed in .../Arduino/hardware/espressif/esp32/cores/esp32/HardwareSerial.cpp!)

MIDI_CREATE_INSTANCE(HardwareSerial, midi1, MIDI1);
MIDI_CREATE_INSTANCE(HardwareSerial, midi2, MIDI2);

void setup()
{
  WiFi.mode(WIFI_STA); // explicitly set mode, esp defaults to STA+AP

  /*
    midi1.begin(31250, SERIAL_8N1, 16, 17);
    midi2.begin(31250, SERIAL_8N1, 35, 34);
  */
  midi1.begin(31250);
  midi2.begin(31250);

  Serial.begin(115200);
  Serial.setDebugOutput(true);

  DEBUG_MSG("<start>\nOSC2Midi\n");

  pinMode(AP_TRIGGER_PIN, INPUT_PULLUP);

  //WiFi.softAP("OSC2Midi", "1357924680");

  udp.begin(8000);

  MIDI1.begin(MIDI_CHANNEL_OMNI);
  MIDI1.setHandleControlChange(MidiCCToOSC);
  MIDI1.turnThruOff();

  MIDI2.begin(MIDI_CHANNEL_OMNI);
  MIDI2.setHandleControlChange(MidiCCToOSC);
  MIDI2.turnThruOff();
}

void loop()
{
  // check if we need to configure a AP
  if (digitalRead(AP_TRIGGER_PIN) == LOW)
  {
    WiFiManager wm;

    //reset settings - for testing
    //wifiManager.resetSettings();

    wm.setConfigPortalTimeout(AP_TIMEOUT);

    if (!wm.startConfigPortal(AP_NAME))
    {
      DEBUG_MSG("Failed to connect and hit timeout - restarting!\n");
      delay(3000);
      ESP.restart();
      delay(5000);
    }
    DEBUG_MSG("\nAP IP address: %s\n", WiFi.softAPIP().toString().c_str());
  }
  else
  {
    OSCMessage msg;
    uint8_t buffer[1024];
    uint16_t outPort;

    // Check if there are any OSC packets to handle
    size_t size = udp.parsePacket();

    if (size > 0 && size <= 1024)
    {
      udp.read(buffer, size);
      msg.fill(buffer, size);

      if (!msg.hasError())
      {
        DEBUG_OSC_MESSAGE(msg);
        msg.route("/midi/cc", OSCToMidiCC);
        //msg.route("/midi/sysex", OSCToMidiSYSEX);
        //msg.route("/midi/note", OSCToMidiNote);
      }
      else
      {
        DEBUG_MSG("Error parsing OSC message: %d\n", msg.getError());
      }

      // Keep track of the client IP address for "talking back"
      clientIP = udp.remoteIP();

      udp.flush();
    }

    // Check if there are any CC messages from synth itself
    //MIDI1.read();
    if (MIDI1.read()) 
    {
      Serial.print("MIDI-IN[1] Type: ");
      Serial.print(MIDI1.getType(), DEC);
      Serial.print(" Data1: ");
      Serial.print(MIDI1.getData1(), DEC);
      Serial.print(" Data2: ");
      Serial.print(MIDI1.getData2(), DEC);
      Serial.print(" Channel: ");
      Serial.print(MIDI1.getChannel(), DEC);
      Serial.println(" Channel: ");
    }

    // MIDI-Merger from MIDI2 to MIDI1
    if (MIDI2.read())
    {
        MIDI1.send(MIDI2.getType(),
                 MIDI2.getData1(),
                 MIDI2.getData2(),
                 MIDI2.getChannel());
      Serial.print("MIDI-IN[2] Type: ");
      Serial.print(MIDI2.getType(), DEC);
      Serial.print(" Data1: ");
      Serial.print(MIDI2.getData1(), DEC);
      Serial.print(" Data2: ");
      Serial.print(MIDI2.getData2(), DEC);
      Serial.print(" Channel: ");
      Serial.print(MIDI2.getChannel(), DEC);
      Serial.println(" Channel: ");
    }
  }
}

void OSCToMidiCC(OSCMessage & msg, int offset)
{
  char address[100] = { 0 };
  uint8_t cc, value;
  uint8_t midichannel;

  msg.getAddress(address, offset, sizeof(address));
  midichannel = getMIDIChannel(address);
  //midichannel--;

  if (msg.size() == 1 && msg.isFloat(0))
  {
    // Single or multi control with sending one value
    cc = getCC(address);
    value = round(msg.getFloat(0));
    value = value > 127 ? 127 : value;
    DEBUG_MSG("MSG: %s\tChannel: %u\t\tCC: %u\tValue: %u\n", address, midichannel, cc, value);
    MIDI1.sendControlChange(cc, value, midichannel);
  }
  else if (msg.size() == 2 && msg.isFloat(0) && msg.isFloat(1))
  {
    // XY pad, two values
    cc = getVar(address, 1);
    value = round(msg.getFloat(0));
    value = value > 127 ? 127 : value;
    DEBUG_MSG("MSG: %s\tChannel: %u\t\tCC: %u\tValue: %u\n", address, midichannel, cc, value);
    MIDI1.sendControlChange(cc, value, midichannel);
    cc = getVar(address, 2);
    value = round(msg.getFloat(1));
    value = value > 127 ? 127 : value;
    DEBUG_MSG("MSG: %s\tChannel: %u\t\tCC: %u\tValue: %u\n", address, midichannel, cc, value);
    MIDI1.sendControlChange(cc, value, midichannel);
  }
  else
  {
    DEBUG_MSG("Cannot handle: %s\n", address);
  }
}

void MidiCCToOSC(uint8_t channel, uint8_t number, uint8_t val)
{
  char buffer[1024];

  snprintf(buffer, sizeof(buffer), "/midi/cc/%u/%u", channel, number);

  DEBUG_MSG("MidiCCToOsc: %s %f\n", buffer, val * 1.0);

  if (clientIP)
  {
    OSCMessage msg = OSCMessage(buffer);
    msg.add(val);

    udp.beginPacket(clientIP, 9000);
    msg.send(udp);
    udp.endPacket();
  }
}