Initial support for multiple Dexed instances

* Currently 2 similar instances, which work with the same parameters
* Only 1 instance with max. 8 notes polyphony on RPi 1
* Chunk size needs to be increased on RPi 1

src/config.h

@@ -30,7 +30,13 @@
 class CConfig		// Configuration for MiniDexed
 {
 public:
+#if RASPPI == 1
+	static const unsigned ToneGenerators = 1;
+	static const unsigned MaxNotes = 8;		// polyphony
+#else
+	static const unsigned ToneGenerators = 2;
 	static const unsigned MaxNotes = 16;		// polyphony
+#endif
 
 #if RASPPI <= 3
 	static const unsigned MaxUSBMIDIDevices = 2;

src/minidexed.cpp

@@ -31,7 +31,7 @@ LOGMODULE ("minidexed");
 
 CMiniDexed::CMiniDexed (CConfig *pConfig, CInterruptSystem *pInterrupt,
 			CGPIOManager *pGPIOManager, CI2CMaster *pI2CMaster)
-:	CDexedAdapter (CConfig::MaxNotes, pConfig->GetSampleRate ()),
+:
 #ifdef ARM_ALLOW_MULTI_CORE
 	CMultiCoreSupport (CMemorySystem::Get ()),
 #endif
@@ -45,6 +45,16 @@ CMiniDexed::CMiniDexed (CConfig *pConfig, CInterruptSystem *pInterrupt,
 			 1000000U * pConfig->GetChunkSize ()/2 / pConfig->GetSampleRate ()),
 	m_bProfileEnabled (m_pConfig->GetProfileEnabled ())
 {
+	assert (m_pConfig);
+
+	for (unsigned i = 0; i < CConfig::ToneGenerators; i++)
+	{
+		m_pTG[i] = new CDexedAdapter (CConfig::MaxNotes, pConfig->GetSampleRate ());
+		assert (m_pTG[i]);
+
+		m_pTG[i]->activate ();
+	}
+
 	for (unsigned i = 0; i < CConfig::MaxUSBMIDIDevices; i++)
 	{
 		m_pMIDIKeyboard[i] = new CMIDIKeyboard (this, pConfig, i);
@@ -96,14 +106,18 @@ bool CMiniDexed::Initialize (void)
 		m_bUseSerial = true;
 	}
 
-	activate ();
-
 	SetVolume (100);
 	ProgramChange (0);
-	setTranspose (24);
 
-	setPBController (12, 1);
-	setMWController (99, 7, 0);
+	for (unsigned i = 0; i < CConfig::ToneGenerators; i++)
+	{
+		assert (m_pTG[i]);
+
+		m_pTG[i]->setTranspose (24);
+
+		m_pTG[i]->setPBController (12, 1);
+		m_pTG[i]->setMWController (99, 7, 0);
+	}
 
 	// setup and start the sound device
 	if (!m_pSoundDevice->AllocateQueueFrames (m_pConfig->GetChunkSize ()))
@@ -198,7 +212,11 @@ void CMiniDexed::ProgramChange (unsigned nProgram)
 
 	uint8_t Buffer[156];
 	m_SysExFileLoader.GetVoice (nProgram, Buffer);
-	loadVoiceParameters (Buffer);
+	for (unsigned i = 0; i < CConfig::ToneGenerators; i++)
+	{
+		assert (m_pTG[i]);
+		m_pTG[i]->loadVoiceParameters (Buffer);
+	}
 
 	m_UI.ProgramChanged (nProgram);
 }
@@ -210,11 +228,81 @@ void CMiniDexed::SetVolume (unsigned nVolume)
 		return;
 	}
 
-	setGain (nVolume / 127.0);
+	for (unsigned i = 0; i < CConfig::ToneGenerators; i++)
+	{
+		assert (m_pTG[i]);
+		m_pTG[i]->setGain (nVolume / 127.0);
+	}
 
 	m_UI.VolumeChanged (nVolume);
 }
 
+void CMiniDexed::keyup (int16_t pitch)
+{
+	for (unsigned i = 0; i < CConfig::ToneGenerators; i++)
+	{
+		assert (m_pTG[i]);
+		m_pTG[i]->keyup (pitch);
+	}
+}
+
+void CMiniDexed::keydown (int16_t pitch, uint8_t velocity)
+{
+	for (unsigned i = 0; i < CConfig::ToneGenerators; i++)
+	{
+		assert (m_pTG[i]);
+		m_pTG[i]->keydown (pitch, velocity);
+	}
+}
+
+void CMiniDexed::setSustain(bool sustain)
+{
+	for (unsigned i = 0; i < CConfig::ToneGenerators; i++)
+	{
+		assert (m_pTG[i]);
+		m_pTG[i]->setSustain (sustain);
+	}
+}
+
+void CMiniDexed::setModWheel (uint8_t value)
+{
+	for (unsigned i = 0; i < CConfig::ToneGenerators; i++)
+	{
+		assert (m_pTG[i]);
+		m_pTG[i]->setModWheel (value);
+	}
+}
+
+void CMiniDexed::setPitchbend (int16_t value)
+{
+	for (unsigned i = 0; i < CConfig::ToneGenerators; i++)
+	{
+		assert (m_pTG[i]);
+		m_pTG[i]->setPitchbend (value);
+	}
+}
+
+void CMiniDexed::ControllersRefresh (void)
+{
+	for (unsigned i = 0; i < CConfig::ToneGenerators; i++)
+	{
+		assert (m_pTG[i]);
+		m_pTG[i]->ControllersRefresh ();
+	}
+}
+
+std::string CMiniDexed::GetVoiceName (unsigned nTG)
+{
+	char VoiceName[11];
+	memset (VoiceName, 0, sizeof VoiceName);
+	assert (m_pTG[nTG]);
+	m_pTG[nTG]->setName (VoiceName);
+
+	std::string Result (VoiceName);
+
+	return Result;
+}
+
 void CMiniDexed::ProcessSound (void)
 {
 	assert (m_pSoundDevice);
@@ -228,7 +316,33 @@ void CMiniDexed::ProcessSound (void)
 		}
 
 		int16_t SampleBuffer[nFrames];
-		getSamples (nFrames, SampleBuffer);
+
+#if RASPPI > 1
+		for (unsigned i = 0; i < CConfig::ToneGenerators; i++)
+		{
+			int16_t TempBuffer[nFrames];
+
+			assert (m_pTG[i]);
+			m_pTG[i]->getSamples (nFrames, TempBuffer);
+
+			if (i == 0)
+			{
+				for (unsigned j = 0; j < nFrames; j++)
+				{
+					SampleBuffer[j] = TempBuffer[j] / CConfig::ToneGenerators;
+				}
+			}
+			else
+			{
+				for (unsigned j = 0; j < nFrames; j++)
+				{
+					SampleBuffer[j] += TempBuffer[j] / CConfig::ToneGenerators;
+				}
+			}
+		}
+#else
+		m_pTG[0]->getSamples (nFrames, SampleBuffer);
+#endif
 
 		if (   m_pSoundDevice->Write (SampleBuffer, sizeof SampleBuffer)
 		    != (int) sizeof SampleBuffer)

src/minidexed.h

@@ -29,6 +29,7 @@
 #include "serialmididevice.h"
 #include "perftimer.h"
 #include <stdint.h>
+#include <string>
 #include <circle/types.h>
 #include <circle/interrupt.h>
 #include <circle/gpiomanager.h>
@@ -36,9 +37,9 @@
 #include <circle/multicore.h>
 #include <circle/soundbasedevice.h>
 
-class CMiniDexed : public CDexedAdapter
+class CMiniDexed
 #ifdef ARM_ALLOW_MULTI_CORE
-	, public CMultiCoreSupport
+:	public CMultiCoreSupport
 #endif
 {
 public:
@@ -59,12 +60,24 @@ public:
 	void ProgramChange (unsigned nProgram);
 	void SetVolume (unsigned nVolume);
 
+	void keyup (int16_t pitch);
+	void keydown (int16_t pitch, uint8_t velocity);
+
+	void setSustain (bool sustain);
+	void setModWheel (uint8_t value);
+	void setPitchbend (int16_t value);
+	void ControllersRefresh (void);
+
+	std::string GetVoiceName (unsigned nTG = 0);
+
 private:
 	void ProcessSound (void);
 
 private:
 	CConfig *m_pConfig;
 
+	CDexedAdapter *m_pTG[CConfig::ToneGenerators];
+
 	CUserInterface m_UI;
 	CSysExFileLoader m_SysExFileLoader;
 

src/userinterface.cpp

@@ -135,20 +135,17 @@ void CUserInterface::ProgramChanged (unsigned nProgram)
 
 	nProgram++;	// MIDI numbering starts with 0, user interface with 1
 
-	// fetch program name from Dexed instance
-	char ProgramName[11];
-	memset (ProgramName, 0, sizeof ProgramName);
 	assert (m_pMiniDexed);
-	m_pMiniDexed->setName (ProgramName);
+	std::string VoiceName = m_pMiniDexed->GetVoiceName ();
 
-	printf ("Loading voice %u: \"%s\"\n", nProgram, ProgramName);
+	printf ("Loading voice %u: \"%s\"\n", nProgram, VoiceName.c_str ());
 
 	if (m_UIMode == UIModeVoiceSelect)
 	{
 		CString String;
 		String.Format ("%u", nProgram);
 
-		DisplayWrite (String, "VOICE", ProgramName);
+		DisplayWrite (String, "VOICE", VoiceName.c_str ());
 	}
 }