Hi all,
I hope you’re safe and healthy. I was looking for some help with a project that I’m working on- a polyphonic USB MIDI pulse synth. The issue is that it works for a few minutes and then seems to stop responding to notes. It continues to show serial communication, and continues to print that it is receiving the correct information in the serial monitor but stops outputting the pulses on the output pin. Any advice would be greatly appreciated. Thanks!
Heres the code:
#include <MIDI.h>
float notes[] = {
8.1757989156, // 0
8.6619572180, // 1
9.1770239974, // 2
10.3008611535, // 3
10.3008611535, // 4
10.9133822323, // 5
11.5623257097, // 6
12.2498573744, // 7
12.9782717994, // 8
13.7500000000, // 9
14.5676175474, // 10
15.4338531643, // 11
16.3515978313, // 12
17.3239144361, // 13
18.3540479948, // 14
19.4454364826, // 15
20.6017223071, // 16
21.8267644646, // 17
23.1246514195, // 18
24.4997147489, // 19
25.9565435987, // 20
27.5000000000, // 21
29.1352350949, // 22
30.8677063285, // 23
32.7031956626, // 24
34.6478288721, // 25
36.7080959897, // 26
38.8908729653, // 27
41.2034446141, // 28
43.6535289291, // 29
46.2493028390, // 30
48.9994294977, // 31
51.9130871975, // 32
55.0000000000, // 33
58.2704701898, // 34
61.7354126570, // 35
65.4063913251, // 36
69.2956577442, // 37
73.4161919794, // 38
77.7817459305, // 39
82.4068892282, // 40
87.3070578583, // 41
92.4986056779, // 42
97.9988589954, // 43
103.8261743950, // 44
110.0000000000, // 45
116.5409403795, // 46
123.4708253140, // 47
130.8127826503, // 48
138.5913154884, // 49
146.8323839587, // 50
155.5634918610, // 51
164.8137784564, // 52
174.6141157165, // 53
184.9972113558, // 54
195.9977179909, // 55
207.6523487900, // 56
220.0000000000, // 57
233.0818807590, // 58
246.9416506281, // 59
261.6255653006, // 60
277.1826309769, // 61
293.6647679174, // 62
311.1269837221, // 63
329.6275569129, // 64
349.2282314330, // 65
369.9944227116, // 66
391.9954359817, // 67
415.3046975799, // 68
440.0000000000, // 69
466.1637615181, // 70
493.8833012561, // 71
523.2511306012, // 72
554.3652619537, // 73
587.3295358348, // 74
622.2539674442, // 75
659.2551138257, // 76
698.4564628660, // 77
739.9888454233, // 78
783.9908719635, // 79
830.6093951599, // 80
880.0000000000, // 81
932.3275230362, // 82
987.7666025122, // 83
1046.5022612024, // 84
1108.7305239075, // 85
1174.6590716696, // 86
1244.5079348883, // 87
1318.5102276515, // 88
1396.9129257320, // 89
1479.9776908465, // 90
1567.9817439270, // 91
1661.2187903198, // 92
1760.0000000000, // 93
1864.6550460724, // 94
1975.5332050245, // 95
2093.0045224048, // 96
2217.4610478150, // 97
2349.3181433393, // 98
2489.0158697766, // 99
2637.0204553030, // 100
2793.8258514640, // 101
2959.9553816931, // 102
3135.9634878540, // 103
3322.4375806396, // 104
3520.0000000000, // 105
3729.3100921447, // 106
3951.0664100490, // 107
4186.0090448096, // 108
4434.9220956300, // 109
4698.6362866785, // 110
4978.0317395533, // 111
5274.0409106059, // 112
5587.6517029281, // 113
5919.9107633862, // 114
5919.9107633862, // 115
6644.8751612791, // 116
7040.0000000000, // 117
7458.6201842894, // 118
7902.1328200980, // 119
8372.0180896192, // 120
8869.8441912599, // 121
9397.2725733570, // 122
9956.0634791066, // 123
10548.0818212118, // 124
11175.3034058561, // 125
11839.8215267723, // 126
12543.8539514160 // 127
};
//notes
byte currentNote = 0;
byte voices[6] = {0,0,0,0,0,0};
byte noteVoice[6] = {0,0,0,0,0,0};
byte noteCounter = 0;
//Pulse output pin
int stpPin = 10;
//Are we currently playing a note?
bool playing[6] = {false, false, false, false, false, false};
//unsigned long durations[6] = {0, 0, 0, 0, 0, 0};
unsigned long long currentMillis = 0;
unsigned long long previousMillis[6] = {0, 0, 0, 0, 0, 0};
//Convert a MIDI note to the number of milliseconds to wait between pulses
unsigned long note2milliseconds(byte note) {
return 1.0 / notes[note] * 100000000000.0;
}
void OnNoteOn(byte channel, byte note, byte velocity) {
long long msNote = note2milliseconds(note);
if(voices[0] == 0){
noteVoice[0] = note;
voices[0] = msNote;
playing[0] = true;
noteCounter ++;
previousMillis[0] = currentMillis;
}
else if (voices[1] == 0){
noteVoice[1] = note;
voices[1] = msNote;
playing[1] = true;
noteCounter ++;
previousMillis[1] = currentMillis;
}
else if (voices[2] == 0){
noteVoice[2] = note;
voices[2] = msNote;
playing[2] = true;
noteCounter ++;
previousMillis[2] = currentMillis;
}
else if (voices[3] == 0){
noteVoice[3] = note;
voices[3] = msNote;
playing[3] = true;
noteCounter ++;
previousMillis[3] = currentMillis;
}
else if (voices[4] == 0){
noteVoice[4] = note;
voices[4] = msNote;
playing[4] = true;
noteCounter ++;
previousMillis[4] = currentMillis;
}
else if (voices[5] == 0){
noteVoice[5] = note;
voices[5] = msNote;
playing[5] = true;
noteCounter ++;
previousMillis[5] = currentMillis;
}
}
void OnNoteOff(byte channel, byte note, byte velocity) {
if(currentNote == noteVoice[0]){
playing[0] = false;
noteCounter --;
noteVoice[0] = 0;
}
else if(currentNote == noteVoice[1]){
playing[1] = false;
noteCounter --;
noteVoice[1] = 0;
}
else if(currentNote == noteVoice[2]){
playing[2] = false;
noteCounter --;
noteVoice[2] = 0;
}
else if(currentNote == noteVoice[3]){
playing[3] = false;
noteCounter --;
noteVoice[3] = 0;
}
else if(currentNote == noteVoice[4]){
playing[4] = false;
noteCounter --;
noteVoice[4] = 0;
}
else if(currentNote == noteVoice[5]){
playing[5] = false;
noteCounter --;
noteVoice[5] = 0;
}
}
void setup() {
pinMode(stpPin, OUTPUT);
digitalWrite(stpPin, LOW);
}
void loop() {
currentMillis = millis();
while(MIDIUSB.available() > 0){
MIDIEvent e;
e = MIDIUSB.read();
//Note Off Shows up in the Serial Monitor as e.type "8"
if(e.type == 8){
currentNote = e.m2;
OnNoteOff(0, e.m2, e.m3);
}
//Note On Shows up in the Serial Monitor as e.type "9"
else if(e.type == 9){
OnNoteOn(0, e.m2, e.m3);
currentNote = e.m2;
Serial.println("NoteOn Received");
}
}
if(playing[0]) {
if(currentMillis - previousMillis[0] >= voices[0]){
digitalWrite(stpPin, HIGH);
//delayMicroseconds(5);
digitalWrite(stpPin, LOW);
}
}
if (playing[1]) {
if(currentMillis - previousMillis[1] >= voices[1]){
digitalWrite(stpPin, HIGH);
//delayMicroseconds(5);
digitalWrite(stpPin, LOW);
}
}
if (playing[2]) {
if(currentMillis - previousMillis[2] >= voices[2]){
digitalWrite(stpPin, HIGH);
//delayMicroseconds(5);
digitalWrite(stpPin, LOW);
}
}
if (playing[3]) {
if(currentMillis - previousMillis[3] >= voices[3]){
digitalWrite(stpPin, HIGH);
//delayMicroseconds(5);
digitalWrite(stpPin, LOW);
}
}
if (playing[4]) {
if(currentMillis - previousMillis[4] >= voices[4]){
digitalWrite(stpPin, HIGH);
//delayMicroseconds(5);
digitalWrite(stpPin, LOW);
}
}
if (playing[5]) {
if(currentMillis - previousMillis[5] >= voices[5]){
digitalWrite(stpPin, HIGH);
//delayMicroseconds(5);
digitalWrite(stpPin, LOW);
}
}
if (noteCounter == 0){
digitalWrite(stpPin, LOW);
}
}