添加一些关于midi播放的项目

2025-03-24 14:30:56 +08:00
parent e31eb22077
commit 498b4ef13b
699 changed files with 186162 additions and 1 deletions
@@ -0,0 +1,87 @@
+#include "SynthCore.h"
+#include <stdint.h>
+#include <stdio.h>
+#include "WaveTable.h"
+#include <avr/io.h>
+#include <avr/interrupt.h>
+#include <avr/pgmspace.h>
+
+#ifdef RUN_TEST
+Synthesizer synthForC;
+#endif
+
+Synthesizer synthForAsm;
+
+
+void SynthInit(Synthesizer* synth)
+{
+    SoundUnitUnion* soundUnionList=&(synth->SoundUnitUnionList[0]);
+	for (uint8_t i = 0; i < POLY_NUM; i++)
+	{
+		soundUnionList[i].combine.increment = 0;
+		soundUnionList[i].combine.wavetablePos_frac = 0;
+		soundUnionList[i].combine.wavetablePos_int = 0;
+		soundUnionList[i].combine.envelopeLevel = 255;
+		soundUnionList[i].combine.envelopePos = 0;
+        soundUnionList[i].combine.val = 0;
+	}
+    synth->lastSoundUnit=0;
+}
+#ifdef RUN_TEST
+void NoteOnC(uint8_t note)
+{
+	uint8_t lastSoundUnit = synthForC.lastSoundUnit;
+
+	cli();
+	synthForC.SoundUnitUnionList[lastSoundUnit].combine.increment = pgm_read_word(&WaveTable_Increment[note&0x7F]);
+	synthForC.SoundUnitUnionList[lastSoundUnit].combine.wavetablePos_frac = 0;
+	synthForC.SoundUnitUnionList[lastSoundUnit].combine.wavetablePos_int = 0;
+	synthForC.SoundUnitUnionList[lastSoundUnit].combine.envelopePos = 0;
+	synthForC.SoundUnitUnionList[lastSoundUnit].combine.envelopeLevel = 255;
+	sei();
+
+	lastSoundUnit++;
+
+	if (lastSoundUnit== POLY_NUM)
+		lastSoundUnit = 0;
+
+    synthForC.lastSoundUnit=lastSoundUnit;
+}
+
+void SynthC(void)
+{
+    synthForC.mixOut=0;
+    SoundUnitUnion* soundUnionList=&(synthForC.SoundUnitUnionList[0]);
+    for(uint8_t i=0;i<POLY_NUM;i++)
+    {
+		if(soundUnionList[i].combine.envelopeLevel==0)
+			continue;
+        soundUnionList[i].combine.val=soundUnionList[i].combine.envelopeLevel*(int8_t)pgm_read_byte(&WaveTable[soundUnionList[i].combine.wavetablePos_int])>>8;
+        soundUnionList[i].combine.sampleVal=(int8_t)pgm_read_byte(&WaveTable[soundUnionList[i].combine.wavetablePos_int]);
+		uint32_t waveTablePos=soundUnionList[i].combine.increment+
+                             soundUnionList[i].combine.wavetablePos_frac+
+                             ((uint32_t)soundUnionList[i].combine.wavetablePos_int<<8); 
+
+        uint16_t waveTablePosInt= waveTablePos>>8;
+        if(waveTablePosInt>=WAVETABLE_CELESTA_C5_LEN)
+           waveTablePosInt-=WAVETABLE_CELESTA_C5_LOOP_LEN;
+        soundUnionList[i].combine.wavetablePos_int= waveTablePosInt;
+        soundUnionList[i].combine.wavetablePos_frac=0xFF&waveTablePos;
+        synthForC.mixOut+=soundUnionList[i].combine.val;
+    }
+}
+
+void GenDecayEnvlopeC(void)
+{
+    SoundUnitUnion* soundUnionList=&(synthForC.SoundUnitUnionList[0]);
+	for (uint8_t i = 0; i < POLY_NUM; i++)
+	{
+		if(soundUnionList[i].combine.wavetablePos_int >= WAVETABLE_CELESTA_C5_ATTACK_LEN &&
+				soundUnionList[i].combine.envelopePos <sizeof(EnvelopeTable)-1)
+		{
+			soundUnionList[i].combine.envelopeLevel = pgm_read_byte(&EnvelopeTable[soundUnionList[i].combine.envelopePos]);
+			soundUnionList[i].combine.envelopePos += 1;
+		}
+	}
+}
+#endif