添加一些关于midi播放的项目

Midi/arduino-midi-player-master/midi2wave.h

@@ -0,0 +1,58 @@
+/*
+ *	Midi2Wave
+ *
+ *	Playback controller
+ *
+ *	Load MIDI events into the global variable
+ */
+
+#ifndef __MIDI2WAVE_H__
+#define __MIDI2WAVE_H__
+
+#include "sequence.h"
+
+#define MAX_NOTE 128
+#define KEYBUF_SIZE 5
+#define SINE_SAMPLE_SIZE 256
+
+#define PIANO(key) (key?(pow(1.0594630943592952645618252949463,key+1-32-49+24)*440):0)
+
+#define NOTE_NUMBER(index) pgm_read_byte_near(notes+index)
+#define NOTE_DELAY(index) (pgm_read_word_near(params+index)>>4)
+#define NOTE_VEL(index) (pgm_read_word_near(params+index)&15)
+
+unsigned char volatile active_keys[KEYBUF_SIZE];
+unsigned char volatile key_vels[MAX_NOTE];
+
+volatile char note_count = 0;
+
+// The current length in milliseconds
+int event_length = 0;
+
+// The primary key
+char key = 61;
+
+/*
+ *	Setup
+ *
+ *	Initialize stuff
+ */
+void setupMidi();
+
+/*
+ *	Render wave buffer
+ *
+ *	Generate the wave buffer with current notes
+ */
+void renderWaveBuffer();
+
+/*
+ *	Load next event
+ *
+ *	Load the next midi note/chord
+ *	Updates the next delay variable
+ *	Updates LEDs
+ */
+void loadNextEvent();
+
+#endif