Output MIDI messages for debugging and development

https://github.com/probonopd/MiniDexed/issues/8#issuecomment-1050231502
Closes #8
Thanks @rsta2

src/circle_stdlib_app.h

@@ -22,6 +22,7 @@
 #include <circle/interrupt.h>
 #include <circle/screen.h>
 #include <circle/serial.h>
+#include <circle/writebuffer.h>
 #include <circle/timer.h>
 #include <circle/logger.h>
 #include <circle/usb/usbhcidevice.h>
@@ -94,7 +95,8 @@ class CStdlibAppScreen : public CStdlibApp
 public:
         CStdlibAppScreen(const char *kernel)
                 : CStdlibApp (kernel),
-                  mScreen (mOptions.GetWidth (), mOptions.GetHeight ()),
+                  mScreenUnbuffered (mOptions.GetWidth (), mOptions.GetHeight ()),
+                  mScreen (&mScreenUnbuffered),
                   mTimer (&mInterrupt),
                   mLogger (mOptions.GetLogLevel (), &mTimer)
         {
@@ -107,7 +109,7 @@ public:
                         return false;
                 }
 
-                if (!mScreen.Initialize ())
+                if (!mScreenUnbuffered.Initialize ())
                 {
                         return false;
                 }
@@ -133,8 +135,9 @@ public:
         }
 
 protected:
-        CScreenDevice   mScreen;
+        CScreenDevice   mScreenUnbuffered;
         //CSerialDevice   mSerial;
+        CWriteBufferDevice mScreen;
         CTimer          mTimer;
         CLogger         mLogger;
 };
@@ -161,7 +164,7 @@ public:
                   mUSBHCI (&mInterrupt, &mTimer, TRUE),
                   mEMMC (&mInterrupt, &mTimer, &mActLED),
 #if !defined(__aarch64__) || !defined(LEAVE_QEMU_ON_HALT)
-                  mConsole (0, TRUE)
+                  mConsole (&mScreen, TRUE)
 #else
                   mConsole (&mScreen)
 #endif

src/kernel.cpp

@@ -83,6 +83,8 @@ CStdlibApp::TShutdownMode CKernel::Run (void)
 		boolean bUpdated = mUSBHCI.UpdatePlugAndPlay ();
 
 		m_pDexed->Process(bUpdated);
+
+		mScreen.Update ();
 	}
 
 	return ShutdownHalt;

src/minidexed.cpp

@@ -3,6 +3,9 @@
 //
 #include "minidexed.h"
 #include <circle/devicenameservice.h>
+#include <stdio.h>
+
+#define MIDI_DUMP
 
 #define MIDI_NOTE_OFF	0b1000
 #define MIDI_NOTE_ON	0b1001
@@ -107,6 +110,25 @@ void CMiniDexed::MIDIPacketHandler (unsigned nCable, u8 *pPacket, unsigned nLeng
 	// The packet contents are just normal MIDI data - see
 	// https://www.midi.org/specifications/item/table-1-summary-of-midi-message
 
+#ifdef MIDI_DUMP
+	switch (nLength)
+	{
+	case 1:
+		printf ("MIDI %u: %02X\n", nCable, (unsigned) pPacket[0]);
+		break;
+
+	case 2:
+		printf ("MIDI %u: %02X %02X\n", nCable,
+			(unsigned) pPacket[0], (unsigned) pPacket[1]);
+		break;
+
+	case 3:
+		printf ("MIDI %u: %02X %02X %02X\n", nCable,
+			(unsigned) pPacket[0], (unsigned) pPacket[1], (unsigned) pPacket[2]);
+		break;
+	}
+#endif
+
 	if (nLength < 3)
 	{
 		return;