Merge 31b2aedf73 into d70232dcd8

src/Makefile

@@ -11,7 +11,8 @@ OBJS = main.o kernel.o minidexed.o config.o userinterface.o uimenu.o \
        sysexfileloader.o performanceconfig.o perftimer.o \
        effect_compressor.o effect_platervbstereo.o uibuttons.o midipin.o \
        arm_float_to_q23.o \
-       net/ftpdaemon.o net/ftpworker.o net/applemidi.o net/udpmidi.o net/mdnspublisher.o udpmididevice.o
+       net/ftpdaemon.o net/ftpworker.o net/applemidi.o net/udpmidi.o net/mdnspublisher.o udpmididevice.o \
+       midichunker.o
 
 OPTIMIZE = -O3
 

src/midichunker.cpp

@@ -0,0 +1,48 @@
+//
+// midichunker.cpp
+//
+// MiniDexed - Dexed FM synthesizer for bare metal Raspberry Pi
+// Copyright (C) 2022-25  The MiniDexed Team
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+//
+
+#include "midichunker.h"
+#include <algorithm>
+
+MIDISysExChunker::MIDISysExChunker(const uint8_t* data, size_t length, size_t chunkSize)
+    : m_data(data), m_length(length), m_chunkSize(chunkSize), m_offset(0) {}
+
+bool MIDISysExChunker::hasNext() const {
+    return m_offset < m_length;
+}
+
+std::vector<uint8_t> MIDISysExChunker::next() {
+    if (!hasNext()) return {};
+    size_t remaining = m_length - m_offset;
+    size_t chunkLen = std::min(m_chunkSize, remaining);
+    // Only the last chunk should contain the final 0xF7
+    if (m_offset + chunkLen >= m_length && m_data[m_length-1] == 0xF7) {
+        chunkLen = m_length - m_offset;
+    } else if (m_offset + chunkLen > 0 && m_data[m_offset + chunkLen - 1] == 0xF7) {
+        chunkLen--;
+    }
+    std::vector<uint8_t> chunk(m_data + m_offset, m_data + m_offset + chunkLen);
+    m_offset += chunkLen;
+    return chunk;
+}
+
+void MIDISysExChunker::reset() {
+    m_offset = 0;
+}

src/midichunker.h

@@ -0,0 +1,37 @@
+//
+// midichunker.h
+//
+// MiniDexed - Dexed FM synthesizer for bare metal Raspberry Pi
+// Copyright (C) 2022-25  The MiniDexed Team
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+//
+
+#pragma once
+#include <cstddef>
+#include <vector>
+#include <cstdint>
+
+class MIDISysExChunker {
+public:
+    MIDISysExChunker(const uint8_t* data, size_t length, size_t chunkSize = 256);
+    bool hasNext() const;
+    std::vector<uint8_t> next();
+    void reset();
+private:
+    const uint8_t* m_data;
+    size_t m_length;
+    size_t m_chunkSize;
+    size_t m_offset;
+};

src/mididevice.cpp

@@ -29,8 +29,9 @@
 #include <assert.h>
 #include "midi.h"
 #include "userinterface.h"
+#include "midichunker.h"
 
-LOGMODULE ("mididevice");
+LOGMODULE("midikeyboard");
 
 // MIDI "System" level (i.e. all TG) custom CC maps
 // Note: Even if number of TGs is not 8, there are only 8
@@ -249,8 +250,7 @@ void CMIDIDevice::MIDIMessageHandler (const u8 *pMessage, size_t nLength, unsign
 		m_pSynthesizer->setMasterVolume(fMasterVolume);
 	}
 	else
-	{
-		// Perform any MiniDexed level MIDI handling before specific Tone Generators
+	{		// Perform any MiniDexed level MIDI handling before specific Tone Generators
 		unsigned nPerfCh = m_pSynthesizer->GetPerformanceSelectChannel();
 		switch (ucType)
 		{
@@ -320,23 +320,21 @@ void CMIDIDevice::MIDIMessageHandler (const u8 *pMessage, size_t nLength, unsign
 		// Process MIDI for each active Tone Generator
 		bool bSystemCCHandled = false;
 		bool bSystemCCChecked = false;
-		for (unsigned nTG = 0; nTG < m_pConfig->GetToneGenerators() && !bSystemCCHandled; nTG++)
-		{
-			if (ucStatus == MIDI_SYSTEM_EXCLUSIVE_BEGIN)
-			{
-				// MIDI SYSEX per MIDI channel
-				uint8_t ucSysExChannel = (pMessage[2] & 0x0F);
-				if (m_ChannelMap[nTG] == ucSysExChannel || m_ChannelMap[nTG] == OmniMode)
-				{
+		if (ucStatus == MIDI_SYSTEM_EXCLUSIVE_BEGIN) {
+			uint8_t ucSysExChannel = (pMessage[2] & 0x0F);
+			for (unsigned nTG = 0; nTG < m_pConfig->GetToneGenerators(); nTG++) {
+				if (m_ChannelMap[nTG] == ucSysExChannel || m_ChannelMap[nTG] == OmniMode) {
 					LOGNOTE("MIDI-SYSEX: channel: %u, len: %u, TG: %u",m_ChannelMap[nTG],nLength,nTG);
 					HandleSystemExclusive(pMessage, nLength, nCable, nTG);
+					if (nLength == 5) {
+						break; // Send dump request only to the first TG that matches the MIDI channel requested via the SysEx message device ID
+					}
 				}
 			}
-			else
-			{
+		} else {
+			for (unsigned nTG = 0; nTG < m_pConfig->GetToneGenerators() && !bSystemCCHandled; nTG++) {
 				if (   m_ChannelMap[nTG] == ucChannel
-				    || m_ChannelMap[nTG] == OmniMode)
-				{
+				    || m_ChannelMap[nTG] == OmniMode) {
 					switch (ucType)
 					{
 					case MIDI_NOTE_ON:
@@ -610,150 +608,194 @@ bool CMIDIDevice::HandleMIDISystemCC(const u8 ucCC, const u8 ucCCval)
 
 void CMIDIDevice::HandleSystemExclusive(const uint8_t* pMessage, const size_t nLength, const unsigned nCable, const uint8_t nTG)
 {
-  int16_t sysex_return;
-
-  sysex_return = m_pSynthesizer->checkSystemExclusive(pMessage, nLength, nTG);
-  LOGDBG("SYSEX handler return value: %d", sysex_return);
-
-  switch (sysex_return)
-  {
-    case -1:
-      LOGERR("SysEx end status byte not detected.");
-      break;
-    case -2:
-      LOGERR("SysEx vendor not Yamaha.");
-      break;
-    case -3:
-      LOGERR("Unknown SysEx parameter change.");
-      break;
-    case -4:
-      LOGERR("Unknown SysEx voice or function.");
-      break;
-    case -5:
-      LOGERR("Not a SysEx voice bulk upload.");
-      break;
-    case -6:
-      LOGERR("Wrong length for SysEx voice bulk upload (not 155).");
-      break;
-    case -7:
-      LOGERR("Checksum error for one voice.");
-      break;
-    case -8:
-      LOGERR("Not a SysEx bank bulk upload.");
-      break;
-    case -9:
-      LOGERR("Wrong length for SysEx bank bulk upload (not 4096).");
-    case -10:
-      LOGERR("Checksum error for bank.");
-      break;
-    case -11:
-      LOGERR("Unknown SysEx message.");
-      break;
-    case 64:
-      LOGDBG("SysEx Function parameter change: %d Value %d",pMessage[4],pMessage[5]);
-      m_pSynthesizer->setMonoMode(pMessage[5],nTG);
-      break;
-    case 65:
-      LOGDBG("SysEx Function parameter change: %d Value %d",pMessage[4],pMessage[5]);
-      m_pSynthesizer->setPitchbendRange(pMessage[5],nTG);
-      break;
-    case 66:
-      LOGDBG("SysEx Function parameter change: %d Value %d",pMessage[4],pMessage[5]);
-      m_pSynthesizer->setPitchbendStep(pMessage[5],nTG);
-      break;
-    case 67:
-      LOGDBG("SysEx Function parameter change: %d Value %d",pMessage[4],pMessage[5]);
-      m_pSynthesizer->setPortamentoMode(pMessage[5],nTG);
-      break;
-    case 68:
-      LOGDBG("SysEx Function parameter change: %d Value %d",pMessage[4],pMessage[5]);
-      m_pSynthesizer->setPortamentoGlissando(pMessage[5],nTG);
-      break;
-    case 69:
-      LOGDBG("SysEx Function parameter change: %d Value %d",pMessage[4],pMessage[5]);
-      m_pSynthesizer->setPortamentoTime(pMessage[5],nTG);
-      break;
-    case 70:
-      LOGDBG("SysEx Function parameter change: %d Value %d",pMessage[4],pMessage[5]);
-      m_pSynthesizer->setModWheelRange(pMessage[5],nTG);
-      break;
-    case 71:
-      LOGDBG("SysEx Function parameter change: %d Value %d",pMessage[4],pMessage[5]);
-      m_pSynthesizer->setModWheelTarget(pMessage[5],nTG);
-      break;
-    case 72:
-      LOGDBG("SysEx Function parameter change: %d Value %d",pMessage[4],pMessage[5]);
-      m_pSynthesizer->setFootControllerRange(pMessage[5],nTG);
-      break;
-    case 73:
-      LOGDBG("SysEx Function parameter change: %d Value %d",pMessage[4],pMessage[5]);
-      m_pSynthesizer->setFootControllerTarget(pMessage[5],nTG);
-      break;
-    case 74:
-      LOGDBG("SysEx Function parameter change: %d Value %d",pMessage[4],pMessage[5]);
-      m_pSynthesizer->setBreathControllerRange(pMessage[5],nTG);
-      break;
-    case 75:
-      LOGDBG("SysEx Function parameter change: %d Value %d",pMessage[4],pMessage[5]);
-      m_pSynthesizer->setBreathControllerTarget(pMessage[5],nTG);
-      break;
-    case 76:
-      LOGDBG("SysEx Function parameter change: %d Value %d",pMessage[4],pMessage[5]);
-      m_pSynthesizer->setAftertouchRange(pMessage[5],nTG);
-      break;
-    case 77:
-      LOGDBG("SysEx Function parameter change: %d Value %d",pMessage[4],pMessage[5]);
-      m_pSynthesizer->setAftertouchTarget(pMessage[5],nTG);
-      break;
-    case 100:
-      // load sysex-data into voice memory
-      LOGDBG("One Voice bulk upload");
-      m_pSynthesizer->loadVoiceParameters(pMessage,nTG);
-      break;
-    case 200:
-      LOGDBG("Bank bulk upload.");
-      //TODO: add code for storing a bank bulk upload
-      LOGNOTE("Currently code  for storing a bulk bank upload is missing!");
-      break;
-    case 455:
-      // Parameter 155 + 300 added by Synth_Dexed = 455
-      LOGDBG("Operators enabled: %d%d%d%d%d%d", (pMessage[5] & 0x20) ? 1 : 0, (pMessage[5] & 0x10) ? 1 : 0, (pMessage[5] & 0x08) ? 1 : 0, (pMessage[5] & 0x04) ? 1 : 0, (pMessage[5] & 0x02) ? 1 : 0, (pMessage[5] & 0x01) ? 1 : 0);
-      m_pSynthesizer->setOPMask(pMessage[5], nTG);
-      break;
-    default:
-      if(sysex_return >= 300 && sysex_return < 500)
-      {
-        LOGDBG("SysEx voice parameter change: Parameter %d value: %d",pMessage[4] + ((pMessage[3] & 0x03) * 128), pMessage[5]);
-        m_pSynthesizer->setVoiceDataElement(pMessage[4] + ((pMessage[3] & 0x03) * 128), pMessage[5],nTG);
-        switch(pMessage[4] + ((pMessage[3] & 0x03) * 128))
-        {
-          case 134:
-            m_pSynthesizer->notesOff(0,nTG);
+    
+    // Check if it is a dump request; these have the format F0 43 2n ff F7
+// with n = the MIDI channel and ff = 00 for voice or 09 for bank
+  // It was confirmed that on the TX816, the device number is interpreted as the MIDI channel; 
+    if (nLength == 5 && pMessage[3] == 0x00)
+    {
+        LOGDBG("SysEx voice dump request: device %d", nTG);
+        SendSystemExclusiveVoice(nTG, m_DeviceName, nCable, nTG);
+                return;
+    }
+    else if (nLength == 5 && pMessage[3] == 0x09)
+    {
+        LOGDBG("SysEx bank dump request: device %d", nTG);
+        SendSystemExclusiveBank(nTG, m_DeviceName, nCable, nTG);
+                return;
+    }
+
+    int16_t sysex_return;
+
+    sysex_return = m_pSynthesizer->checkSystemExclusive(pMessage, nLength, nTG);
+    LOGDBG("SYSEX handler return value: %d", sysex_return);
+
+    switch (sysex_return)
+    {
+        case -1:
+            LOGERR("SysEx end status byte not detected.");
             break;
-        }
-      }
-      else if(sysex_return >= 500 && sysex_return < 600)
-      {
-        LOGDBG("SysEx send voice %u request",sysex_return-500);
-        SendSystemExclusiveVoice(sysex_return-500, nCable, nTG);
-      }
-      break;
-  }
+        case -2:
+            LOGERR("SysEx vendor not Yamaha.");
+            break;
+        case -3:
+            LOGERR("Unknown SysEx parameter change.");
+            break;
+        case -4:
+            LOGERR("Unknown SysEx voice or function.");
+            break;
+        case -5:
+            LOGERR("Not a SysEx voice bulk upload.");
+            break;
+        case -6:
+            LOGERR("Wrong length for SysEx voice bulk upload (not 155).");
+            break;
+        case -7:
+            LOGERR("Checksum error for one voice.");
+            break;
+        case -8:
+            LOGERR("Not a SysEx bank bulk upload.");
+            break;
+        case -9:
+            LOGERR("Wrong length for SysEx bank bulk upload (not 4096).");
+        case -10:
+            LOGERR("Checksum error for bank.");
+            break;
+        case -11:
+            LOGERR("Unknown SysEx message.");
+            break;
+        case 64:
+            LOGDBG("SysEx Function parameter change: %d Value %d",pMessage[4],pMessage[5]);
+            m_pSynthesizer->setMonoMode(pMessage[5],nTG);
+            break;
+        case 65:
+            LOGDBG("SysEx Function parameter change: %d Value %d",pMessage[4],pMessage[5]);
+            m_pSynthesizer->setPitchbendRange(pMessage[5],nTG);
+            break;
+        case 66:
+            LOGDBG("SysEx Function parameter change: %d Value %d",pMessage[4],pMessage[5]);
+            m_pSynthesizer->setPitchbendStep(pMessage[5],nTG);
+            break;
+        case 67:
+            LOGDBG("SysEx Function parameter change: %d Value %d",pMessage[4],pMessage[5]);
+            m_pSynthesizer->setPortamentoMode(pMessage[5],nTG);
+            break;
+        case 68:
+            LOGDBG("SysEx Function parameter change: %d Value %d",pMessage[4],pMessage[5]);
+            m_pSynthesizer->setPortamentoGlissando(pMessage[5],nTG);
+            break;
+        case 69:
+            LOGDBG("SysEx Function parameter change: %d Value %d",pMessage[4],pMessage[5]);
+            m_pSynthesizer->setPortamentoTime(pMessage[5],nTG);
+            break;
+        case 70:
+            LOGDBG("SysEx Function parameter change: %d Value %d",pMessage[4],pMessage[5]);
+            m_pSynthesizer->setModWheelRange(pMessage[5],nTG);
+            break;
+        case 71:
+            LOGDBG("SysEx Function parameter change: %d Value %d",pMessage[4],pMessage[5]);
+            m_pSynthesizer->setModWheelTarget(pMessage[5],nTG);
+            break;
+        case 72:
+            LOGDBG("SysEx Function parameter change: %d Value %d",pMessage[4],pMessage[5]);
+            m_pSynthesizer->setFootControllerRange(pMessage[5],nTG);
+            break;
+        case 73:
+            LOGDBG("SysEx Function parameter change: %d Value %d",pMessage[4],pMessage[5]);
+            m_pSynthesizer->setFootControllerTarget(pMessage[5],nTG);
+            break;
+        case 74:
+            LOGDBG("SysEx Function parameter change: %d Value %d",pMessage[4],pMessage[5]);
+            m_pSynthesizer->setBreathControllerRange(pMessage[5],nTG);
+            break;
+        case 75:
+            LOGDBG("SysEx Function parameter change: %d Value %d",pMessage[4],pMessage[5]);
+            m_pSynthesizer->setBreathControllerTarget(pMessage[5],nTG);
+            break;
+        case 76:
+            LOGDBG("SysEx Function parameter change: %d Value %d",pMessage[4],pMessage[5]);
+            m_pSynthesizer->setAftertouchRange(pMessage[5],nTG);
+            break;
+        case 77:
+            LOGDBG("SysEx Function parameter change: %d Value %d",pMessage[4],pMessage[5]);
+            m_pSynthesizer->setAftertouchTarget(pMessage[5],nTG);
+            break;
+        case 100:
+            // load sysex-data into voice memory
+            LOGDBG("One Voice bulk upload");
+            m_pSynthesizer->loadVoiceParameters(pMessage,nTG);
+            break;
+        case 200:
+            LOGDBG("Bank bulk upload.");
+            //TODO: add code for storing a bank bulk upload
+            LOGNOTE("Currently code  for storing a bulk bank upload is missing!");
+            break;
+        case 455:
+            // Parameter 155 + 300 added by Synth_Dexed = 455
+            LOGDBG("Operators enabled: %d%d%d%d%d%d", (pMessage[5] & 0x20) ? 1 : 0, (pMessage[5] & 0x10) ? 1 : 0, (pMessage[5] & 0x08) ? 1 : 0, (pMessage[5] & 0x04) ? 1 : 0, (pMessage[5] & 0x02) ? 1 : 0, (pMessage[5] & 0x01) ? 1 : 0);
+            m_pSynthesizer->setOPMask(pMessage[5], nTG);
+            break;
+        default:
+            if(sysex_return >= 300 && sysex_return < 500)
+            {
+                LOGDBG("SysEx voice parameter change: Parameter %d value: %d",pMessage[4] + ((pMessage[3] & 0x03) * 128), pMessage[5]);
+                m_pSynthesizer->setVoiceDataElement(pMessage[4] + ((pMessage[3] & 0x03) * 128), pMessage[5],nTG);
+                switch(pMessage[4] + ((pMessage[3] & 0x03) * 128))
+                {
+                    case 134:
+                        m_pSynthesizer->notesOff(0,nTG);
+                        break;
+                }
+            }
+    }
 }
 
-void CMIDIDevice::SendSystemExclusiveVoice(uint8_t nVoice, const unsigned nCable, uint8_t nTG)
+void CMIDIDevice::SendSystemExclusiveVoice(uint8_t nVoice, const std::string& deviceName, unsigned nCable, uint8_t nTG)
 {
-  uint8_t voicedump[163];
-
-  // Get voice sysex dump from TG
-  m_pSynthesizer->getSysExVoiceDump(voicedump, nTG);
-
-  TDeviceMap::const_iterator Iterator;
+	// Example: F0 43 20 00 F7
+    uint8_t voicedump[163];
+    m_pSynthesizer->getSysExVoiceDump(voicedump, nTG);
+    TDeviceMap::const_iterator Iterator = s_DeviceMap.find(deviceName);
+    if (Iterator != s_DeviceMap.end()) {
+        Iterator->second->Send(voicedump, sizeof(voicedump), nCable);
+        LOGDBG("Send SYSEX voice dump %u to \"%s\"", nVoice, deviceName.c_str());
+    } else {
+        LOGWARN("No device found in s_DeviceMap for name: %s", deviceName.c_str());
+    }
+}
 
-  // send voice dump to all MIDI interfaces
-  for(Iterator = s_DeviceMap.begin(); Iterator != s_DeviceMap.end(); ++Iterator)
-  {
-    Iterator->second->Send (voicedump, sizeof(voicedump)*sizeof(uint8_t));
-    // LOGDBG("Send SYSEX voice dump %u to \"%s\"",nVoice,Iterator->first.c_str());
-  }
-} 
+void CMIDIDevice::SendSystemExclusiveBank(uint8_t nVoice, const std::string& deviceName, unsigned nCable, uint8_t nTG)
+{
+    LOGNOTE("SendSystemExclusiveBank");
+    static uint8_t voicedump[4096]; // Correct size for DX7 bank dump
+    m_pSynthesizer->getSysExBankDump(voicedump, nTG);
+    LOGNOTE("SendSystemExclusiveBank: after getSysExBankDump");
+    LOGNOTE("SendSystemExclusiveBank: before chunking");
+    MIDISysExChunker chunker(voicedump, 4096, 512);
+    LOGNOTE("SendSystemExclusiveBank: after chunker creation");
+    TDeviceMap::const_iterator Iterator = s_DeviceMap.find(deviceName);
+    if (Iterator != s_DeviceMap.end()) {
+        LOGNOTE("SendSystemExclusiveBank: device found, starting chunk send loop");
+        int chunkCount = 0;
+        while (chunker.hasNext()) {
+            std::vector<uint8_t> chunk = chunker.next();
+            // Pad chunk to a multiple of 4 bytes for USB MIDI
+            size_t pad = chunk.size() % 4;
+            if (pad != 0) {
+                chunk.resize(chunk.size() + (4 - pad), 0x00);
+            }
+            if (chunk.size() % 4 != 0) {
+                LOGERR("Chunk size %u is not a multiple of 4 before Send!", (unsigned)chunk.size());
+                assert(chunk.size() % 4 == 0);
+            }
+            LOGNOTE("SendSystemExclusiveBank: sending chunk %d, size=%u", chunkCount, (unsigned)chunk.size());
+            Iterator->second->Send(chunk.data(), chunk.size(), nCable);
+            chunkCount++;
+        }
+        LOGNOTE("SendSystemExclusiveBank: all chunks sent, total=%d", chunkCount);
+        LOGDBG("Send SYSEX bank dump %u to \"%s\" in 512-byte chunks", nVoice, deviceName.c_str());
+    } else {
+        LOGWARN("SendSystemExclusiveBank: No device found in s_DeviceMap for name: %s", deviceName.c_str());
+    }
+    LOGNOTE("SendSystemExclusiveBank: exit");
+}

src/mididevice.h

@@ -54,7 +54,10 @@ public:
 	u8 GetChannel (unsigned nTG) const;
 
 	virtual void Send (const u8 *pMessage, size_t nLength, unsigned nCable = 0) {}
-	virtual void SendSystemExclusiveVoice(uint8_t nVoice, const unsigned nCable, uint8_t nTG);
+	// Change signature to specify device name
+	void SendSystemExclusiveVoice(uint8_t nVoice, const std::string& deviceName, unsigned nCable, uint8_t nTG);
+	void SendSystemExclusiveBank(uint8_t nVoice, const std::string& deviceName, unsigned nCable, uint8_t nTG);
+	const std::string& GetDeviceName() const { return m_DeviceName; }
 
 protected:
 	void MIDIMessageHandler (const u8 *pMessage, size_t nLength, unsigned nCable = 0);

src/midikeyboard.cpp

@@ -21,15 +21,24 @@
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 //
 #include "midikeyboard.h"
+#include "midichunker.h"
 #include <circle/devicenameservice.h>
+#include <circle/sched/scheduler.h>
+#include <circle/timer.h>
+#include <circle/logger.h>
 #include <cstring>
 #include <assert.h>
+#include <unistd.h>
+#include <vector>
+
+LOGMODULE("midikeyboard");
 
 CMIDIKeyboard::CMIDIKeyboard (CMiniDexed *pSynthesizer, CConfig *pConfig, CUserInterface *pUI, unsigned nInstance)
 :	CMIDIDevice (pSynthesizer, pConfig, pUI),
 	m_nSysExIdx (0),
 	m_nInstance (nInstance),
-	m_pMIDIDevice (0)
+	m_pMIDIDevice (0),
+	m_HasQueuedSysEx(false)
 {
 	m_DeviceName.Format ("umidi%u", nInstance+1);
 
@@ -42,6 +51,34 @@ CMIDIKeyboard::~CMIDIKeyboard (void)
 
 void CMIDIKeyboard::Process (boolean bPlugAndPlayUpdated)
 {
+    // Send any queued SysEx response in a safe context
+    if (m_HasQueuedSysEx && m_pMIDIDevice) {
+        // Pad to multiple of 4 bytes for USB MIDI event packets
+        size_t sysexLen = m_QueuedSysEx.size();
+        size_t paddedLen = (sysexLen + 3) & ~3; // round up to next multiple of 4
+        if (paddedLen > sysexLen) {
+            m_QueuedSysEx.resize(paddedLen, 0x00);
+        }
+        // Send in safe chunks to avoid USB lockup
+        static constexpr size_t kUSBMIDIMaxChunk = 256; // or 512 if your stack allows
+        size_t offset = 0;
+        // Only send one chunk per Process() call to avoid blocking or watchdog reset
+        if (offset < m_QueuedSysEx.size()) {
+            size_t chunk = std::min(kUSBMIDIMaxChunk, m_QueuedSysEx.size() - offset);
+            LOGNOTE("SendEventPackets: about to send chunk at offset %u, length=%u", offset, chunk);
+            m_pMIDIDevice->SendEventPackets(m_QueuedSysEx.data() + offset, chunk);
+            offset += chunk;
+            // Save progress for next Process() call
+            if (offset < m_QueuedSysEx.size()) {
+                // Not done yet, keep queued SysEx and return
+                m_QueuedSysEx.erase(m_QueuedSysEx.begin(), m_QueuedSysEx.begin() + chunk);
+                return;
+            }
+        }
+        m_QueuedSysEx.clear();
+        m_HasQueuedSysEx = false;
+    }
+
 	while (!m_SendQueue.empty ())
 	{
 		TSendQueueEntry Entry = m_SendQueue.front ();
@@ -73,16 +110,80 @@ void CMIDIKeyboard::Process (boolean bPlugAndPlayUpdated)
 	}
 }
 
-void CMIDIKeyboard::Send (const u8 *pMessage, size_t nLength, unsigned nCable)
+// Helper: Convert SysEx to USB MIDI event packets
+std::vector<std::vector<uint8_t>> SysExToUSBMIDIPackets(const uint8_t* data, size_t length, unsigned cable)
 {
-	TSendQueueEntry Entry;
-	Entry.pMessage = new u8[nLength];
-	Entry.nLength = nLength;
-	Entry.nCable = nCable;
+    LOGNOTE("SysExToUSBMIDIPackets: length=%u, cable=%u", (unsigned)length, cable);
+    std::vector<std::vector<uint8_t>> packets;
+    size_t idx = 0;
+    while (idx < length) {
+        size_t remaining = length - idx;
+        uint8_t cin;
+        uint8_t packet[4] = {0};
+        packet[0] = (uint8_t)(cable << 4); // Upper nibble: cable number, lower: CIN
+        if (remaining >= 3) {
+            if (idx == 0) {
+                cin = 0x4; // SysEx Start or continue
+            } else {
+                cin = 0x4; // SysEx continue
+            }
+            packet[0] |= cin;
+            packet[1] = data[idx];
+            packet[2] = data[idx+1];
+            packet[3] = data[idx+2];
+            LOGNOTE("  Packet: [%02X %02X %02X %02X] (idx=%u)", packet[0], packet[1], packet[2], packet[3], (unsigned)idx);
+            idx += 3;
+        } else if (remaining == 2) {
+            cin = 0x6; // SysEx ends with 2 bytes
+            packet[0] |= cin;
+            packet[1] = data[idx];
+            packet[2] = data[idx+1];
+            packet[3] = 0;
+            LOGNOTE("  Packet: [%02X %02X %02X %02X] (last 2 bytes)", packet[0], packet[1], packet[2], packet[3]);
+            idx += 2;
+        } else if (remaining == 1) {
+            cin = 0x5; // SysEx ends with 1 byte
+            packet[0] |= cin;
+            packet[1] = data[idx];
+            packet[2] = 0;
+            packet[3] = 0;
+            LOGNOTE("  Packet: [%02X %02X %02X %02X] (last 1 byte)", packet[0], packet[1], packet[2], packet[3]);
+            idx += 1;
+        }
+        packets.push_back({packet[0], packet[1], packet[2], packet[3]});
+    }
+    LOGNOTE("SysExToUSBMIDIPackets: total packets=%u", (unsigned)packets.size());
+    return packets;
+}
 
-	memcpy (Entry.pMessage, pMessage, nLength);
+void CMIDIKeyboard::Send(const u8 *pMessage, size_t nLength, unsigned nCable)
+{
+    // NOTE: For USB MIDI, we do NOT use MIDISysExChunker for SysEx sending.
+    // The chunker splits SysEx into arbitrary chunks for traditional MIDI (e.g., serial/DIN),
+    // but USB MIDI requires SysEx to be split into 4-byte USB MIDI event packets with specific CIN headers.
+    // Therefore, for USB MIDI, we packetize SysEx according to the USB MIDI spec and send with SendEventPackets().
+    // See: https://www.usb.org/sites/default/files/midi10.pdf (USB MIDI 1.0 spec)
+    // This is why the chunker is bypassed for USB MIDI SysEx sending.
 
-	m_SendQueue.push (Entry);
+    // Check for valid SysEx
+    if (nLength >= 2 && pMessage[0] == 0xF0 && pMessage[nLength-1] == 0xF7 && m_pMIDIDevice) {
+        // Convert to USB MIDI event packets and send directly
+        auto packets = SysExToUSBMIDIPackets(pMessage, nLength, nCable);
+        std::vector<uint8_t> flat;
+        for (const auto& pkt : packets) {
+            flat.insert(flat.end(), pkt.begin(), pkt.end());
+        }
+        m_QueuedSysEx = flat;
+        m_HasQueuedSysEx = true;
+        return;
+    }
+    // Not a SysEx, send as-is
+    TSendQueueEntry Entry;
+    Entry.pMessage = new u8[nLength];
+    Entry.nLength = nLength;
+    Entry.nCable = nCable;
+    memcpy(Entry.pMessage, pMessage, nLength);
+    m_SendQueue.push(Entry);
 }
 
 // Most packets will be passed straight onto the main MIDI message handler

src/midikeyboard.h

@@ -30,6 +30,7 @@
 #include <circle/string.h>
 #include <circle/types.h>
 #include <queue>
+#include <vector>
 
 #define USB_SYSEX_BUFFER_SIZE (MAX_DX7_SYSEX_LENGTH+128) // Allow a bit spare to handle unexpected SysEx messages
 
@@ -45,6 +46,14 @@ public:
 
 	void Send (const u8 *pMessage, size_t nLength, unsigned nCable = 0) override;
 
+	void QueueSysExResponse(const uint8_t* data, size_t len) {
+		m_QueuedSysEx.assign(data, data + len);
+		m_HasQueuedSysEx = true;
+	}
+	bool HasQueuedSysExResponse() const { return m_HasQueuedSysEx; }
+	void ClearQueuedSysExResponse() { m_QueuedSysEx.clear(); m_HasQueuedSysEx = false; }
+	const std::vector<uint8_t>& GetQueuedSysExResponse() const { return m_QueuedSysEx; }
+
 private:
 	static void MIDIPacketHandler (unsigned nCable, u8 *pPacket, unsigned nLength, unsigned nDevice, void *pParam);
 	static void DeviceRemovedHandler (CDevice *pDevice, void *pContext);
@@ -68,6 +77,11 @@ private:
 	CUSBMIDIDevice * volatile m_pMIDIDevice;
 
 	std::queue<TSendQueueEntry> m_SendQueue;
+
+	std::vector<uint8_t> m_QueuedSysEx;
+	bool m_HasQueuedSysEx = false;
 };
 
+std::vector<std::vector<uint8_t>> SysExToUSBMIDIPackets(const uint8_t* data, size_t length, unsigned cable);
+
 #endif

src/minidexed.cpp

@@ -666,7 +666,7 @@ void CMiniDexed::ProgramChange (unsigned nProgram, unsigned nTG)
 		// MIDI channel configured for this TG
 		if (m_nMIDIChannel[nTG] < CMIDIDevice::Channels)
 		{
-			m_SerialMIDI.SendSystemExclusiveVoice(nProgram,0,nTG);
+			m_SerialMIDI.SendSystemExclusiveVoice(nProgram, m_SerialMIDI.GetDeviceName(), 0, nTG);
 		}
 	}
 
@@ -1873,6 +1873,67 @@ void CMiniDexed::getSysExVoiceDump(uint8_t* dest, uint8_t nTG)
 	dest[162] = 0xF7; // SysEx end
 }
 
+void CMiniDexed::getSysExBankDump(uint8_t* dest, uint8_t nTG)
+{
+    LOGNOTE("getSysExBankDump: called for TG=%u", nTG);
+	return;
+    constexpr size_t kVoices = 32;
+    constexpr size_t kPackedVoiceSize = 128;
+    constexpr size_t kBulkDataSize = kVoices * kPackedVoiceSize; // 4096
+    constexpr size_t kHeaderSize = 6;
+    constexpr size_t kTotalSize = kHeaderSize + kBulkDataSize + 2; // +checksum +F7 = 4104
+
+    // Header (Yamaha DX7 standard)
+    LOGNOTE("getSysExBankDump: writing header");
+    dest[0] = 0xF0; // SysEx start
+    dest[1] = 0x43; // Yamaha ID
+    dest[2] = 0x00; // Sub-status (0), device/channel (0)
+    dest[3] = 0x09; // Format number (9 = 32 voices)
+    dest[4] = 0x20; // Byte count MSB (4096 = 0x1000, MSB=0x20)
+    dest[5] = 0x00; // Byte count LSB
+
+    LOGNOTE("getSysExBankDump: header: %02X %02X %02X %02X %02X %02X", dest[0], dest[1], dest[2], dest[3], dest[4], dest[5]);
+
+    // Fill packed voice data
+    uint8_t* pData = dest + kHeaderSize;
+    uint8_t checksum = 0;
+    for (size_t v = 0; v < kVoices; ++v) {
+        uint8_t packedVoice[kPackedVoiceSize];
+        m_SysExFileLoader.GetVoice(m_nVoiceBankID[nTG], v, packedVoice);
+        for (size_t b = 0; b < kPackedVoiceSize; ++b) {
+            pData[v * kPackedVoiceSize + b] = packedVoice[b];
+            checksum += packedVoice[b];
+        }
+    }
+    LOGNOTE("getSysExBankDump: packed data filled, checksum before complement: %02X", checksum);
+
+    // Checksum: 2's complement, masked to 7 bits
+    checksum = (~checksum + 1) & 0x7F;
+    dest[kHeaderSize + kBulkDataSize] = checksum;
+    LOGNOTE("getSysExBankDump: checksum after complement: %02X", checksum);
+
+    // Footer
+    dest[kHeaderSize + kBulkDataSize + 1] = 0xF7;
+    LOGNOTE("getSysExBankDump: footer: %02X", dest[kHeaderSize + kBulkDataSize + 1]);
+
+    // Log summary of dump
+    LOGNOTE("getSysExBankDump: total size: %d bytes", kTotalSize);
+    std::string dumpStart, dumpEnd;
+    char buf[8];
+    for (size_t i = 0; i < 16; ++i) {
+        snprintf(buf, sizeof(buf), "%02X", dest[i]);
+        dumpStart += buf;
+        if (i < 15) dumpStart += " ";
+    }
+    for (size_t i = kTotalSize - 16; i < kTotalSize; ++i) {
+        snprintf(buf, sizeof(buf), "%02X", dest[i]);
+        dumpEnd += buf;
+        if (i < kTotalSize - 1) dumpEnd += " ";
+    }
+    LOGNOTE("getSysExBankDump: first 16 bytes: %s", dumpStart.c_str());
+    LOGNOTE("getSysExBankDump: last 16 bytes: %s", dumpEnd.c_str());
+}
+
 void CMiniDexed::setOPMask(uint8_t uchOPMask, uint8_t nTG)
 {
 	m_uchOPMask[nTG] = uchOPMask;

src/minidexed.h

@@ -124,6 +124,7 @@ public:
 	void loadVoiceParameters(const uint8_t* data, uint8_t nTG);
 	void setVoiceDataElement(uint8_t data, uint8_t number, uint8_t nTG);
 	void getSysExVoiceDump(uint8_t* dest, uint8_t nTG);
+	void getSysExBankDump(uint8_t* dest, uint8_t nTG);
 	void setOPMask(uint8_t uchOPMask, uint8_t nTG);
 
 	void setModController (unsigned controller, unsigned parameter, uint8_t value, uint8_t nTG);

src/net/applemidi.cpp

@@ -31,6 +31,9 @@
 #include "applemidi.h"
 #include "byteorder.h"
 
+#define MAX_DX7_SYSEX_LENGTH 4104
+#define MAX_MIDI_MESSAGE MAX_DX7_SYSEX_LENGTH
+
 // #define APPLEMIDI_DEBUG
 
 LOGMODULE("applemidi");
@@ -876,4 +879,46 @@ bool CAppleMIDIParticipant::SendFeedbackPacket()
 #endif
 
 	return SendPacket(m_pControlSocket, &m_InitiatorIPAddress, m_nInitiatorControlPort, &FeedbackPacket, sizeof(FeedbackPacket));
+}
+
+bool CAppleMIDIParticipant::SendMIDIToHost(const u8* pData, size_t nSize)
+{
+	if (m_State != TState::Connected)
+		return false;
+
+	// Build RTP-MIDI packet
+	TRTPMIDI packet;
+	packet.nFlags = htons((RTPMIDIVersion << 14) | RTPMIDIPayloadType);
+	packet.nSequence = htons(++m_nSequence);
+	packet.nTimestamp = htonl(0); // No timestamping for now
+	packet.nSSRC = htonl(m_nSSRC);
+
+	// RTP-MIDI command section: header + MIDI data
+	// Header: 0x80 | length (if length < 0x0F)
+	u8 midiHeader = 0x00;
+	size_t midiLen = nSize;
+	if (midiLen < 0x0F) {
+		midiHeader = midiLen & 0x0F;
+	} else {
+		midiHeader = 0x80 | ((midiLen >> 8) & 0x0F);
+	}
+
+	u8 buffer[sizeof(TRTPMIDI) + 2 + MAX_MIDI_MESSAGE];
+	size_t offset = 0;
+	memcpy(buffer + offset, &packet, sizeof(TRTPMIDI));
+	offset += sizeof(TRTPMIDI);
+	buffer[offset++] = midiHeader;
+	if (midiLen >= 0x0F) {
+		buffer[offset++] = midiLen & 0xFF;
+	}
+	memcpy(buffer + offset, pData, midiLen);
+	offset += midiLen;
+
+	if (SendPacket(m_pMIDISocket, &m_InitiatorIPAddress, m_nInitiatorMIDIPort, buffer, offset) <= 0) {
+		LOGNOTE("Failed to send MIDI data to host");
+		return false;
+	}
+	
+	LOGDBG("Successfully sent %zu bytes of MIDI data", nSize);
+	return true;
 }

src/net/applemidi.h

@@ -46,6 +46,9 @@ public:
 
 	virtual void Run() override;
 
+public:
+	bool SendMIDIToHost(const u8* pData, size_t nSize);
+
 private:
 	void ControlInvitationState();
 	void MIDIInvitationState();

src/udpmididevice.cpp

@@ -25,6 +25,8 @@
 #include <cstring>
 #include "udpmididevice.h"
 #include <assert.h>
+#include <circle/net/netsubsystem.h>
+#include <circle/net/in.h>
 
 #define VIRTUALCABLE 24
 
@@ -64,6 +66,13 @@ boolean CUDPMIDIDevice::Initialize (void)
 	}
 	else
 		LOGNOTE("UDP MIDI receiver initialized");
+
+	// UDP MIDI send socket setup (default: broadcast 255.255.255.255:1999)
+	CNetSubSystem* pNet = CNetSubSystem::Get();
+	m_pUDPSendSocket = new CSocket(pNet, IPPROTO_UDP);
+	m_UDPDestAddress.Set(0xFFFFFFFF); // Broadcast by default
+	m_UDPDestPort = 1999;
+
 	return true;
 }
 
@@ -87,4 +96,21 @@ void CUDPMIDIDevice::OnAppleMIDIDisconnect(const CIPAddress* pIPAddress, const c
 void CUDPMIDIDevice::OnUDPMIDIDataReceived(const u8* pData, size_t nSize)
 {
 	MIDIMessageHandler(pData, nSize, VIRTUALCABLE);
+}
+
+void CUDPMIDIDevice::Send(const u8 *pMessage, size_t nLength, unsigned nCable)
+{
+    bool sentRTP = false;
+    if (m_pAppleMIDIParticipant && m_pAppleMIDIParticipant->SendMIDIToHost(pMessage, nLength)) {
+        sentRTP = true;
+        LOGNOTE("Sent %d bytes to RTP-MIDI host", nLength);
+    }
+    if (!sentRTP && m_pUDPSendSocket) {
+        int res = m_pUDPSendSocket->SendTo(pMessage, nLength, 0, m_UDPDestAddress, m_UDPDestPort);
+        if (res < 0) {
+            LOGERR("Failed to send %d bytes to UDP MIDI host", nLength);
+        } else {
+            LOGNOTE("Sent %d bytes to UDP MIDI host (broadcast)", nLength);
+        }
+    }
 }

src/udpmididevice.h

@@ -29,6 +29,7 @@
 #include "config.h"
 #include "net/applemidi.h"
 #include "net/udpmidi.h"
+#include "midi.h"
 
 class CMiniDexed;
 
@@ -43,6 +44,7 @@ public:
 	virtual void OnAppleMIDIConnect(const CIPAddress* pIPAddress, const char* pName) override;
 	virtual void OnAppleMIDIDisconnect(const CIPAddress* pIPAddress, const char* pName) override;
 	virtual void OnUDPMIDIDataReceived(const u8* pData, size_t nSize) override;
+	virtual void Send(const u8 *pMessage, size_t nLength, unsigned nCable = 0) override;
 
 private:
 	CMiniDexed *m_pSynthesizer;
@@ -50,6 +52,11 @@ private:
 	CBcmRandomNumberGenerator m_Random;
 	CAppleMIDIParticipant* m_pAppleMIDIParticipant; // AppleMIDI participant instance
 	CUDPMIDIReceiver* m_pUDPMIDIReceiver;
+	CSocket* m_pUDPSendSocket = nullptr;
+	CIPAddress m_UDPDestAddress;
+	unsigned m_UDPDestPort = 1999;
+	CIPAddress m_LastUDPSenderAddress;
+	unsigned m_LastUDPSenderPort = 0;
 };
 
 #endif