Question - Can we retrieve a SysEx dump greater than 64 bytes?

[DarthDev]

Hello

Is it possible to receive a SysEx dump that is greater than 64 bytes? I can't seem to find a way to achieve this. Any assistance would be greatly appreciated.

Many thanks
DarthDev

[YuuichiAkagawa]

USB MIDI Packet size is 64 bytes.
If you want to receive more than 64 bytes of data, you need to iteration.

#include <usbh_midi.h>
#include <usbhub.h>

// Satisfy the IDE, which needs to see the include statment in the ino too.
#ifdef dobogusinclude
#include <spi4teensy3.h>
#endif
#include <SPI.h>

#define _MIDI_SERIAL_PORT Serial

USB Usb;
USBH_MIDI  Midi(&Usb);

void setup()
{
  _MIDI_SERIAL_PORT.begin(115200);

  //Workaround for non UHS2.0 Shield
  pinMode(7, OUTPUT);
  digitalWrite(7, HIGH);

  if (Usb.Init() == -1) {
    while (1); //halt
  }//if (Usb.Init() == -1...
  delay( 200 );
}

void loop()
{
  Usb.Task();
  uint32_t t1 = (uint32_t)micros();
  if ( Midi ) {
    MIDI_poll();
  }
}

// Poll USB MIDI Controler
void MIDI_poll()
{
  uint8_t size;
  uint8_t outBuf[4];
  uint8_t sysexBuf[3];
  char buf[20];

  do {
    if ( (size = Midi.RecvRawData(outBuf)) > 0 ) {
      uint8_t rc = Midi.extractSysExData(outBuf, sysexBuf);
      if ( rc != 0 ) { 
        //SysEx
        _MIDI_SERIAL_PORT.print("SysEx:");
        for (int i = 0; i < rc; i++) {
          sprintf(buf, " %02X", sysexBuf[i]);
          _MIDI_SERIAL_PORT.print(buf);
        }
        
      } else {
        _MIDI_SERIAL_PORT.print("_____:");
        for (int i = 1; i <= size; i++) {
          sprintf(buf, " %02X", outBuf[i]);
          _MIDI_SERIAL_PORT.print(buf);
        }
      }
      _MIDI_SERIAL_PORT.println();
    }
  } while (size > 0);
}

[DarthDev]

Thanks very much for your help. I'm still struggling though. I'm not getting the whole SysEx dump. The first 64 bytes are fine, but then the following three bytes are 06 01 F7, which means "end of SysEx message", if I understand correctly. The next set of bytes is some sort of signal that my MIDI device uses to let the PC know it is still connected - the remainder of the SysEx dump seems to have vanished.

[YuuichiAkagawa]

Umm...
I was test with following connection.

PC-- (USB) --> Roland Quad-Capture --(MIDI)--> Roland UM-ONE --(USB)--> UHS+Arduino

I received a 1000 byte SysEx message from PC.

[jsmmns2000]

Hello,
i am using this library to send sysex commands from an Arduino MKRzero to a Zoom G1xon pedal over USB. I can send program change commands successfully.
If i send the generic ID request F0 7E 00 06 01 F7, i get the correct reply F0 7E 00 06 02 52 64 00 01 00 31 2E 32 31 F7,
but when i send F0 52 00 64 09 00 00 02 F7 (request patch 02) , i get a message that misses random bytes.
The correct reply should be F0 52 00 64 08 00 00 02 70 00 00 11 00 00 02 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 21 00 00 10 48 0B 10 01 64 00 45 22 26 48 08 02 00 00 06 00 00 21 00 00 12 03 40 08 00 2E 20 06 2C 00 00 00 00 00 00 00 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 60 00 64 01 00 00 00 20 03 00 00 00 00 42 6C 75 65 00 20 4C 65 61 64 20 00 07 37 39 77 0C F7 (144 bytes)

I usually receive from 90 to 132 bytes.

I 'm using the code above (for the iteration) in which i have added a button in the loop() that sends the command end then goes for Usb.Task(); and MIDI_poll(); staff. I tried with some delay after sending the command but i get the same behavior.

Am i missing something? Can you suggest anything?

Using amidi i can successfully send and receive the commands.

Thanks

[YuuichiAkagawa]

Hello, @jsmmns2000
I bought G1on.

but when i send F0 52 00 64 09 00 00 02 F7 (request patch 02) , i get a message that misses random bytes.

I sent F0 52 00 63 09 00 00 02 F7 and received the correct result.
I used with Arduino Uno.

Code

#include <usbh_midi.h>
#include <usbhub.h>

// Satisfy the IDE, which needs to see the include statment in the ino too.
#ifdef dobogusinclude
#include <spi4teensy3.h>
#endif
#include <SPI.h>

#define _MIDI_SERIAL_PORT Serial

uint8_t genericid[] {
  0xF0, 0x7E, 0x00, 0x06, 0x01, 0xF7
};

uint8_t reqpatch2[] {
  0xF0, 0x52, 0x00, 0x63, 0x09, 0x00, 0x00, 0x02, 0xF7 
};

USB Usb;
USBH_MIDI  Midi(&Usb);
uint8_t phase = 0;

void setup()
{
  _MIDI_SERIAL_PORT.begin(115200);

  //Workaround for non UHS2.0 Shield
  pinMode(7, OUTPUT);
  digitalWrite(7, HIGH);

  if (Usb.Init() == -1) {
    while (1); //halt
  }//if (Usb.Init() == -1...
  delay( 200 );
}

void loop()
{
  Usb.Task();
  if ( Midi ) {
    MIDI_poll();
    if( phase == 0 ){
        _MIDI_SERIAL_PORT.println("\nRequest: Generic ID");
        Midi.SendSysEx(genericid, sizeof(genericid));
        phase++;
        delay(10);
    }else if( phase == 1 ){
        _MIDI_SERIAL_PORT.println("\nRequest: Patch 02");
        Midi.SendSysEx(reqpatch2, sizeof(reqpatch2));
        phase++;
        delay(10);
    }
  }
}

// Poll USB MIDI Controler
void MIDI_poll()
{
  uint8_t size;
  uint8_t outBuf[4];
  uint8_t sysexBuf[3];
  char buf[20];

  do {
    if ( (size = Midi.RecvRawData(outBuf)) > 0 ) {
      uint8_t rc = Midi.extractSysExData(outBuf, sysexBuf);
      if ( rc != 0 ) { 
        //SysEx
        _MIDI_SERIAL_PORT.print("SysEx:");
        for (int i = 0; i < rc; i++) {
          sprintf(buf, " %02X", sysexBuf[i]);
          _MIDI_SERIAL_PORT.print(buf);
        }
        
      } else {
        _MIDI_SERIAL_PORT.print("_____:");
        for (int i = 1; i <= size; i++) {
          sprintf(buf, " %02X", outBuf[i]);
          _MIDI_SERIAL_PORT.print(buf);
        }
      }
      _MIDI_SERIAL_PORT.println();
    }
  } while (size > 0);
}

Result

Request: Generic ID
SysEx: F0 7E 00
SysEx: 06 02 52
SysEx: 63 00 00
SysEx: 00 31 2E
SysEx: 32 31 F7

Request: Patch 02
SysEx: F0 52 00
SysEx: 63 08 00
SysEx: 00 02 70
SysEx: 00 00 11
SysEx: 00 00 42
SysEx: 00 38 00
SysEx: 00 64 00
SysEx: 00 00 00
SysEx: 00 00 00
SysEx: 00 00 00
SysEx: 00 21 00
SysEx: 00 10 48
SysEx: 0B 10 01
SysEx: 64 00 45
SysEx: 22 26 48
SysEx: 08 02 00
SysEx: 00 06 00
SysEx: 00 21 00
SysEx: 00 12 03
SysEx: 40 08 00
SysEx: 2E 20 06
SysEx: 2C 00 00
SysEx: 00 00 00
SysEx: 00 00 00
SysEx: 01 00 00
SysEx: 00 00 00
SysEx: 00 00 00
SysEx: 00 00 00
SysEx: 00 00 00
SysEx: 00 00 00
SysEx: 00 00 00
SysEx: 01 00 00
SysEx: 00 00 00
SysEx: 00 00 00
SysEx: 00 00 00
SysEx: 00 00 00
SysEx: 00 00 00
SysEx: 00 00 60
SysEx: 00 64 01
SysEx: 00 00 00
SysEx: 20 03 00
SysEx: 00 00 00
SysEx: 42 6C 75
SysEx: 65 00 20
SysEx: 4C 65 61
SysEx: 64 20 00
SysEx: 59 54 05
SysEx: 40 0D F7

[YuuichiAkagawa]

Closing this issue due to lack of feedback. Feel free to reopen the issue again if needed.