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Made time calculations all be in integer microseconds

main
Mike Lynch 2023-12-27 15:16:37 +11:00
parent f4d75a627e
commit 71fd9e319a
1 changed files with 40 additions and 31 deletions
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71
Xmas/Xmas.ino
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@ -35,7 +35,7 @@ the absolute start time should include a count-in
int m1[] = { 0, 2, 4, 5, 7, 9, 11, 12 };
int s1[] = { 0, 3, 5, 7, 9, 11, 13, 15 };
int s1[] = { 0, 2, 4, 6, 8, 10, 12, 14 };
float d1[] = { 1.0, 0.5, 1.0, 0.5, 1.0, 0.5, 1.0, 0.5 };
int m2[] = { 0, 4, 7, 12, 0, 4, 7, 12, 0, 4, 7, 12, 0, 4, 7, 12 };
int s2[] = { 0, 1 , 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 };
@ -45,12 +45,14 @@ float d2[] = { 0.5, 0.5, 0.5, 0.5, 0.5, 0.5, 0.5, 0.5, 0.5, 0.5, 0.5, 0.5, 0.5
float gate = 0.5;
int bpm = 180;
float beat_s = 60.0 / (float)bpm;
int beat_m = round(1000.0 * beat_s);
int beat = round(1000.0 * beat_s);
// count_in = number of beats since t0 to wait before we startt playing
// repeat = number of beats to repeat - could be computed from the sequence data
long count_in_m = 4 * beat_m;
// From here on, all times are in milliseconds to head off floating point errors
long count_in = 4 * beat;
int repeat = 16;
@ -112,31 +114,49 @@ void setup(void) {
seq2.start = s2;
seq2.len = sizeof(m2) / sizeof(m2[0]);
times_to_ms(seq1);
times_to_ms(seq2);
}
void times_to_ms(sequencer& seq) {
for( int i = 0; i < seq.len; i++ ) {
seq.start[i] *= beat;
seq.duration[i] = (float)beat * seq.duration[i];
}
}
void loop() {
long now = millis();
long beat_int = (now - start_time - count_in_m) % (beat_m * repeat);
float beat = (float)(beat_int) / (float)beat_m;
runSequencer(seq1, now, beat);
runSequencer(seq2, now, beat);
long t = now - start_time;
long beats = -1;
if( t >= count_in ) {
beats = (t - count_in) % (beat * repeat);
runSequencer(seq1, t, beats);
runSequencer(seq2, t, beats);
}
}
void runSequencer(sequencer& seq, long now, float beat) {
if( seq.s < seq.len - 1 ) {
if( beat > (float)seq.start[seq.s + 1] ) {
seq.s += 1;
seq.rel = now + round((float)beat_m * seq.duration[seq.s]);
if( seq.melody[seq.s] > -1 ) {
mcp.setChannelValue(seq.pitch, tuning[seq.melody[seq.s]]);
mcp.setChannelValue(seq.gate, 4095);
}
seq.playing = 1;
if( seq.s == seq.len - 1 ) {
seq.s = -1;
}
void runSequencer(sequencer& seq, long now, long beats) {
int next = seq.s + 1;
int start;
if( next > seq.len - 1 ) {
seq.s = -1;
next = 0;
return; // don't start the loop yet
} else {
start = seq.start[next];
}
if( beats >= start ) {
seq.s = next;
seq.rel = now + seq.duration[seq.s];
if( seq.melody[seq.s] > -1 ) {
mcp.setChannelValue(seq.pitch, tuning[seq.melody[seq.s]]);
mcp.setChannelValue(seq.gate, 4095);
}
seq.playing = 1;
}
if( seq.playing ) {
if( now > seq.rel ) {
@ -146,14 +166,3 @@ void runSequencer(sequencer& seq, long now, float beat) {
}
}
// void noteOn(sequencer& seq, int note) {
// if( note > -1 ) {
// mcp.setChannelValue(seq.pitch, tuning[note]);
// mcp.setChannelValue(seq.gate, 4095);
// }
// }
// void noteOff(sequencer& seq) {
// mcp.setChannelValue(seq.gate, 0);
// }