add -midi-in option back as a toggle

src/main.c

@@ -537,6 +537,10 @@ usage()
 	printf("-sf2 <SoundFont filename>\n");
 	printf("\tInitialize MIDI synth with the specified SoundFont.\n");
 	printf("\tThe -midicard option must be specified along with this option.\n");
+	printf("-midi-in\n");
+	printf("\tConnect the system MIDI input devices to the input of the first UART.\n");
+	printf("\tof the emulated MIDI card. The -midicard option is required for this\n");
+	printf("\toption to have any effect.\n");
 #ifdef TRACE
 	printf("-trace [<address>]\n");
 	printf("\tPrint instruction trace. Optionally, a trigger address\n");
@@ -663,6 +667,10 @@ main(int argc, char **argv)
 			sf2_path = argv[0];
 			argc--;
 			argv++;
+		} else if (!strcmp(argv[0], "-midi-in")) {
+			argc--;
+			argv++;
+			fs_midi_autoconnect = true;
 		} else if (!strcmp(argv[0], "-run")) {
 			argc--;
 			argv++;

src/midi.c

@@ -129,6 +129,7 @@ struct midi_serial_regs mregs[2];
 static bool serial_midi_mutexes_initialized = false;
 
 void midi_serial_iir_check(uint8_t sel);
+bool fs_midi_autoconnect = false;
 
 #ifndef __EMSCRIPTEN__
 
@@ -268,7 +269,7 @@ void midi_init()
     dl_fluid_settings_setnum(fl_settings, "synth.sample-rate", 
     AUDIO_SAMPLERATE);
     dl_fluid_settings_setstr(fl_settings, "midi.portname", "Commander X16 Emulator");
-    dl_fluid_settings_setint(fl_settings, "midi.autoconnect", 1);
+    dl_fluid_settings_setint(fl_settings, "midi.autoconnect", fs_midi_autoconnect);
     fl_synth = dl_new_fluid_synth(fl_settings);
     fl_mdriver = dl_new_fluid_midi_driver(fl_settings, handle_midi_event, &mregs[0]);
 

src/midi.h

@@ -42,3 +42,4 @@ void midi_load_sf2(uint8_t* filename);
 void midi_synth_render(int16_t* buf, int len);
 bool midi_serial_irq(void);
 
+extern bool fs_midi_autoconnect;