add DAW Display support for Arturia MiniLab 3 and KeyLab 3 Essential

based on https://github.com/PrzemekBarski/arturia-keylab-essential-mk3-programming-guide

Tested on a Arturia MiniLab 3

Keylab 3 Essential is not tested

src/Makefile

@@ -9,7 +9,8 @@ CMSIS_DIR = ../CMSIS_5/CMSIS
 OBJS = main.o kernel.o minidexed.o config.o userinterface.o uimenu.o \
        mididevice.o midikeyboard.o serialmididevice.o pckeyboard.o \
        sysexfileloader.o performanceconfig.o perftimer.o \
-       effect_compressor.o effect_platervbstereo.o uibuttons.o midipin.o
+       effect_compressor.o effect_platervbstereo.o uibuttons.o midipin.o \
+       dawdisplay.o
 
 OPTIMIZE = -O3
 

src/config.cpp

@@ -197,6 +197,8 @@ void CConfig::Load (void)
 	m_MIDIButtonActionTGUp = m_Properties.GetString ("MIDIButtonActionTGUp", "");
 	m_MIDIButtonActionTGDown = m_Properties.GetString ("MIDIButtonActionTGDown", "");
 
+	m_bDAWDisplayEnabled = m_Properties.GetNumber ("DAWDisplayEnabled", 0) != 0;
+
 	m_bEncoderEnabled = m_Properties.GetNumber ("EncoderEnabled", 0) != 0;
 	m_nEncoderPinClock = m_Properties.GetNumber ("EncoderPinClock", 10);
 	m_nEncoderPinData = m_Properties.GetNumber ("EncoderPinData", 9);
@@ -703,6 +705,11 @@ const char *CConfig::GetMIDIButtonActionTGDown (void) const
 	return m_MIDIButtonActionTGDown.c_str();
 }
 
+bool CConfig::GetDAWDisplayEnabled (void) const
+{
+	return m_bDAWDisplayEnabled;
+}
+
 bool CConfig::GetEncoderEnabled (void) const
 {
 	return m_bEncoderEnabled;

src/config.h

@@ -232,6 +232,8 @@ class CConfig		// Configuration for MiniDexed
 	const char *GetMIDIButtonActionTGUp (void) const;
 	const char *GetMIDIButtonActionTGDown (void) const;
 
+	bool GetDAWDisplayEnabled (void) const;
+
 	// KY-040 Rotary Encoder
 	// GPIO pin numbers are chip numbers, not header positions
 	bool GetEncoderEnabled (void) const;
@@ -355,6 +357,8 @@ class CConfig		// Configuration for MiniDexed
 	std::string m_MIDIButtonActionTGUp;
 	std::string m_MIDIButtonActionTGDown;
 
+	bool m_bDAWDisplayEnabled;
+
 	bool m_bEncoderEnabled;
 	unsigned m_nEncoderPinClock;
 	unsigned m_nEncoderPinData;

src/dawdisplay.cpp

@@ -0,0 +1,134 @@
+//
+// dawdisplay.cpp
+//
+// MiniDexed - Dexed FM synthesizer for bare metal Raspberry Pi
+// Copyright (C) 2022  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 "dawdisplay.h"
+#include "midikeyboard.h"
+
+#include <circle/string.h>
+
+CDAWDisplay::CDAWDisplay (CMIDIKeyboard *pMIDIKeyboard)
+:	m_pMIDIKeyboard (pMIDIKeyboard),
+	m_DisplayType (Unknown)
+{
+}
+
+void CDAWDisplay::OnConnect ()
+{
+	static const uint8_t inquiry[] = {0xF0, 0x7E, 0x7F, 0x06, 0x01, 0xF7};
+
+	m_DisplayType = Unknown;
+
+	m_pMIDIKeyboard->Send (inquiry, sizeof inquiry, 0);
+}
+
+void CDAWDisplay::MIDISysexHandler (u8 *pPacket, unsigned nLength, unsigned nCable)
+{
+	static const uint8_t pInquiryResp[] =	{0xF0, 0x7E, 0x7F, 0x06, 0x02};
+	static const uint8_t pArturia[] =	{0xF0, 0x7E, 0x7F, 0x06, 0x02, 0x00, 0x20, 0x6B};
+	static const uint8_t pMiniLab3[] =	{0xF0, 0x7E, 0x7F, 0x06, 0x02, 0x00, 0x20, 0x6B, 0x02, 0x00, 0x04, 0x04};
+	static const uint8_t pKeyLabEs3_49[] =	{0xF0, 0x7E, 0x7F, 0x06, 0x02, 0x00, 0x20, 0x6B, 0x02, 0x00, 0x05, 0x72};
+	static const uint8_t pKeyLabEs3_61[] =	{0xF0, 0x7E, 0x7F, 0x06, 0x02, 0x00, 0x20, 0x6B, 0x02, 0x00, 0x05, 0x74};
+	static const uint8_t pKeyLabEs3_88[] =	{0xF0, 0x7E, 0x7F, 0x06, 0x02, 0x00, 0x20, 0x6B, 0x02, 0x00, 0x05, 0x78};
+
+	static const uint8_t pArturiaDAWInit[] = {0xF0, 0x00, 0x20, 0x6B, 0x7F, 0x42, 0x02, 0x00, 0x40, 0x6A, 0x21, 0xF7};
+
+	if (nLength > sizeof pInquiryResp && memcmp (pPacket, pInquiryResp, sizeof pInquiryResp) != 0)
+		return;
+
+	if (nLength > sizeof pArturia && memcmp (pPacket, pArturia, sizeof pArturia) == 0)
+	{
+		m_pMIDIKeyboard->Send (pArturiaDAWInit, sizeof pArturiaDAWInit, 0);
+
+		if (nLength > sizeof pMiniLab3 && memcmp (pPacket, pMiniLab3, sizeof pMiniLab3) == 0)
+		{
+			m_DisplayType = MiniLab3;
+			DisplayWrite ("MiniDexed", "", "On MiniLab 3", 0, 0);
+		}
+
+		if (nLength > sizeof pKeyLabEs3_49 && (
+			memcmp (pPacket, pKeyLabEs3_49, sizeof pKeyLabEs3_49) == 0 ||
+			memcmp (pPacket, pKeyLabEs3_61, sizeof pKeyLabEs3_61) == 0 ||
+			memcmp (pPacket, pKeyLabEs3_88, sizeof pKeyLabEs3_88) == 0))
+		{
+			m_DisplayType = KeyLabEs3;
+			DisplayWrite ("MiniDexed", "", "On KeyLab 3 Essential", 0, 0);
+		}
+	}
+}
+
+void CDAWDisplay::ArturiaDisplayWrite (const u8 *pHdr, const unsigned nHdrSize, const char *pMenu, const char *pParam, const char *pValue)
+{
+	static unsigned L1MaxLen = 18;
+
+	CString line1 (pParam);
+	CString line2 (pValue);
+
+	size_t nLen = strlen (pParam) + strlen (pMenu);
+	if (nLen < L1MaxLen)
+	{
+		for (unsigned i = L1MaxLen - nLen; i > 0; i--)
+		{
+			line1.Append (" ");
+		}
+	}
+
+	line1.Append (pMenu);
+
+	int nLine1Len = strlen (line1);
+	int nLine2Len = strlen (line2);
+	int nOffset = 0;
+
+	uint8_t pLines[nHdrSize + nLine1Len + 2 + nLine2Len  + 2];
+
+	memcpy (pLines, pHdr, nHdrSize);
+	nOffset += nHdrSize;
+
+	memcpy (&pLines[nOffset], line1, nLine1Len + 1);
+	nOffset += nLine1Len + 1;
+
+	pLines[nOffset] = 0x02;
+	nOffset += 1;
+
+	memcpy (&pLines[nOffset], line2, nLine2Len + 1);
+	nOffset += nLine2Len + 1;
+
+	pLines[nOffset] = 0xf7;
+	nOffset += 1;
+
+	m_pMIDIKeyboard->Send (pLines, nOffset, 0);
+}
+
+void CDAWDisplay::DisplayWrite (const char *pMenu, const char *pParam, const char *pValue,
+				bool bArrowDown, bool bArrowUp)
+{
+	static const uint8_t pMiniLab3Hdr[] =	{0xF0, 0x00, 0x20, 0x6B, 0x7F, 0x42, 0x04, 0x02, 0x60, 0x12, 0x01};
+	static const uint8_t pKeyLabEs3Hdr[] =	{0xF0, 0x00, 0x20, 0x6B, 0x7F, 0x42, 0x04, 0x01, 0x60, 0x12, 0x01};
+
+	switch (m_DisplayType)
+	{
+	case MiniLab3:
+		ArturiaDisplayWrite (pMiniLab3Hdr, sizeof pMiniLab3Hdr, pMenu, pParam, pValue);
+		break;
+	case KeyLabEs3:
+		ArturiaDisplayWrite (pKeyLabEs3Hdr, sizeof pKeyLabEs3Hdr, pMenu, pParam, pValue);
+		break;
+	default:
+		break;
+	}
+}

src/dawdisplay.h

@@ -0,0 +1,53 @@
+//
+// dawdisplay.h
+//
+// MiniDexed - Dexed FM synthesizer for bare metal Raspberry Pi
+// Copyright (C) 2022  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/>.
+//
+#ifndef _dawdisplay_h
+#define _dawdisplay_h
+
+#include <circle/types.h>
+
+class CMIDIKeyboard;
+
+class CDAWDisplay
+{
+public:
+	CDAWDisplay (CMIDIKeyboard *pKeyboard);
+
+	void OnConnect ();
+	void MIDISysexHandler (u8 *pPacket, unsigned nLength, unsigned nCable);
+
+	void DisplayWrite (const char *pMenu, const char *pParam, const char *pValue,
+			   bool bArrowDown, bool bArrowUp);
+
+private:
+	void ArturiaDisplayWrite (const u8 *pHdr, const unsigned nHdrSize, const char *pMenu, const char *pParam, const char *pValue);
+
+	enum TDisplayType
+	{
+		Unknown,
+		MiniLab3,
+		KeyLabEs3,
+	};
+
+	CMIDIKeyboard *m_pMIDIKeyboard;
+
+	TDisplayType m_DisplayType;
+};
+
+#endif

src/midikeyboard.cpp

@@ -39,20 +39,25 @@ CMIDIKeyboard::CMIDIKeyboard (CMiniDexed *pSynthesizer, CConfig *pConfig, CUserI
 :	CMIDIDevice (pSynthesizer, pConfig, pUI),
 	m_nSysExIdx (0),
 	m_nInstance (nInstance),
-	m_pMIDIDevice (0)
+	m_pMIDIDevice (0),
+	m_pDAWDisplay (0)
 {
 	assert (m_nInstance < MaxInstances);
 	s_pThis[m_nInstance] = this;
 
 	m_DeviceName.Format ("umidi%u", nInstance+1);
 
 	AddDevice (m_DeviceName);
+
+	if (pConfig->GetDAWDisplayEnabled ())
+		m_pDAWDisplay = new CDAWDisplay(this);
 }
 
 CMIDIKeyboard::~CMIDIKeyboard (void)
 {
 	assert (m_nInstance < MaxInstances);
 	s_pThis[m_nInstance] = 0;
+	delete m_pDAWDisplay;
 }
 
 void CMIDIKeyboard::Process (boolean bPlugAndPlayUpdated)
@@ -85,6 +90,9 @@ void CMIDIKeyboard::Process (boolean bPlugAndPlayUpdated)
 			m_pMIDIDevice->RegisterPacketHandler (s_pMIDIPacketHandler[m_nInstance]);
 
 			m_pMIDIDevice->RegisterRemovedHandler (DeviceRemovedHandler, this);
+
+			if (m_pDAWDisplay)
+				m_pDAWDisplay->OnConnect();
 		}
 	}
 }
@@ -136,6 +144,10 @@ void CMIDIKeyboard::USBMIDIMessageHandler (u8 *pPacket, unsigned nLength, unsign
 				m_SysEx[m_nSysExIdx++] = pPacket[i];
 				//printf ("SysEx End    Idx=%d\n", m_nSysExIdx);
 				MIDIMessageHandler (m_SysEx, m_nSysExIdx, nCable);
+
+				if (m_pDAWDisplay)
+					m_pDAWDisplay->MIDISysexHandler (m_SysEx, m_nSysExIdx, nCable);
+
 				// Reset ready for next time
 				m_nSysExIdx = 0;
 			}
@@ -190,3 +202,10 @@ void CMIDIKeyboard::DeviceRemovedHandler (CDevice *pDevice, void *pContext)
 
 	pThis->m_pMIDIDevice = 0;
 }
+
+void CMIDIKeyboard::DisplayWrite (const char *pMenu, const char *pParam, const char *pValue,
+			   bool bArrowDown, bool bArrowUp)
+{
+	if (m_pMIDIDevice && m_pDAWDisplay)
+		m_pDAWDisplay->DisplayWrite (pMenu, pParam, pValue, bArrowDown, bArrowUp);
+}

src/midikeyboard.h

@@ -25,6 +25,7 @@
 
 #include "mididevice.h"
 #include "config.h"
+#include "dawdisplay.h"
 #include <circle/usb/usbmidi.h>
 #include <circle/device.h>
 #include <circle/string.h>
@@ -48,6 +49,9 @@ class CMIDIKeyboard : public CMIDIDevice
 
 	void Send (const u8 *pMessage, size_t nLength, unsigned nCable = 0) override;
 
+	void DisplayWrite (const char *pMenu, const char *pParam, const char *pValue,
+			   bool bArrowDown, bool bArrowUp);
+
 private:
 	static void MIDIPacketHandler0 (unsigned nCable, u8 *pPacket, unsigned nLength);
 	static void MIDIPacketHandler1 (unsigned nCable, u8 *pPacket, unsigned nLength);
@@ -76,6 +80,8 @@ class CMIDIKeyboard : public CMIDIDevice
 
 	std::queue<TSendQueueEntry> m_SendQueue;
 
+	CDAWDisplay *m_pDAWDisplay;
+
 	static CMIDIKeyboard *s_pThis[MaxInstances];
 
 	static TMIDIPacketHandler * const s_pMIDIPacketHandler[MaxInstances];

src/minidexed.cpp

@@ -1775,6 +1775,17 @@ void CMiniDexed::setMasterVolume (float32_t vol)
 	nMasterVolume=vol;
 }
 
+void CMiniDexed::DisplayWrite (const char *pMenu, const char *pParam, const char *pValue,
+			       bool bArrowDown, bool bArrowUp)
+{
+	m_UI.DisplayWrite (pMenu, pParam, pValue, bArrowDown, bArrowUp);
+
+	for (unsigned i = 0; i < CConfig::MaxUSBMIDIDevices; i++)
+	{
+		m_pMIDIKeyboard[i]->DisplayWrite (pMenu, pParam, pValue, bArrowDown, bArrowUp);
+	}
+}
+
 std::string CMiniDexed::GetPerformanceFileName(unsigned nID)
 {
 	return m_PerformanceConfig.GetPerformanceFileName(nID);

src/minidexed.h

@@ -228,6 +228,9 @@ class CMiniDexed
 
 	void setMasterVolume (float32_t vol);
 
+	void DisplayWrite (const char *pMenu, const char *pParam, const char *pValue,
+			   bool bArrowDown, bool bArrowUp);
+
 private:
 	int16_t ApplyNoteLimits (int16_t pitch, unsigned nTG);	// returns < 0 to ignore note
 	uint8_t m_uchOPMask[CConfig::AllToneGenerators];

src/minidexed.ini

@@ -139,6 +139,9 @@ MIDIButtonActionTGUp=
 MIDIButtonTGDown=0
 MIDIButtonActionTGDown=
 
+# DAW Display (Arturia MiniLab 3, KeyLab Essential 3)
+DAWDisplayEnabled=0
+
 # KY-040 Rotary Encoder
 EncoderEnabled=1
 EncoderPinClock=10