ESP32 amend TX pin help please :)

[bill-i-am-code]

I am working on a project which will need a MIDI output on an ESP32, and am hoping for some advice. Due to the other elements of the project, I would like to use UART2 TX on GPIO27 (the default for UART2 TX is GPIO17)

The code below works as expected and outputs on pin 27

#define RXD2 16
#define TXD2 27

void setup()
{
  // Set MIDI baud rate:
  Serial2.begin(31250, SERIAL_8N1, RXD2, TXD2);
}

void loop()
{
  //Note on channel 1 (0x90), middle C (0x3C), middle velocity (0x45):
  sendMIDI(0x90, 0x3C, 0x45);
  delay(100);
  //Note on channel 1 (0x90), middle C (0x3C), silent velocity (0x00):
  sendMIDI(0x90, 0x3C, 0x00);
  delay(1000);
}

void sendMIDI(int cmd, int pitch, int velocity)
{
  Serial2.write(cmd);
  Serial2.write(pitch);
  Serial2.write(velocity);
}

The code below produces MIDI output on pin 17. I got an error without all static const long BaudRate = 31250;

Is there something I can add into this to alter the pin used by serial2. I have looked through the documentation but struggling to find this. I am still quite new to C. Thanks for any help or guidance.

#include <MIDI.h>

struct MySettings : public MIDI_NAMESPACE::DefaultSettings
{
  static const long BaudRate = 31250;
// CAN I ADD SOMETHING HERE TO SPECIFY THE TX PIN OF SERIAL2?
};
MIDI_CREATE_CUSTOM_INSTANCE(HardwareSerial, Serial2, dinMIDI, MySettings);

void setup()
{
  dinMIDI.begin(MIDI_CHANNEL_OMNI); // Listen to all incoming messages
}

void loop()
{
  // Send note 42 with velocity 127 on channel 1
  dinMIDI.sendNoteOn(42, 127, 1);

}

[franky47]

The MIDI library only uses the Serial (or Serial2 in your case) to send data, it's up to you to configure this Serial2 object to use a custom pin.

I'm not familiar with the ESP32, but if you can reconfigure a serial port to use another pin, I figure the ESP documentation is a good place to look for a solution.

[alf45tar]

I solved in the following way

https://github.com/alf45tar/PedalinoMini/blob/760e8ef91ea89b79bfd6b8792047e21ff303e41b/src/ESPSerialMIDI.h#L41
https://github.com/alf45tar/PedalinoMini/blob/760e8ef91ea89b79bfd6b8792047e21ff303e41b/src/Pedalino.h#L127