Added changes to 14, plus 19 and 20

main
Mike Lynch 2024-10-19 10:45:01 +11:00
parent 57e12d95fd
commit 41870f2d5e
3 changed files with 200 additions and 3 deletions

View File

@ -16,8 +16,8 @@ int note = 0;
// int pitch[] = { 8, 4, 5, -1, 4, 3, -1, 2, 3, 4, -1, 6, 3, 4, 5, -1 }; // int pitch[] = { 8, 4, 5, -1, 4, 3, -1, 2, 3, 4, -1, 6, 3, 4, 5, -1 };
// float dur[] = { 0.5,0.5,0.5,0.5,0.25,0.25,0.25,0.25,0.5,0.5,0.5,0.5,0.25,0.25,0.25,0.25,0.25, }; // float dur[] = { 0.5,0.5,0.5,0.5,0.25,0.25,0.25,0.25,0.5,0.5,0.5,0.5,0.25,0.25,0.25,0.25,0.25, };
int pitch[] = { 1, -1, -1, -1, 1, -1, -1, -1, 1, -1, -1, -1, 0, -1, -1, -1 }; int pitch[] = { 12, -1, 11, -1, 12, -1, 15, -1, 12, -1, 11, -1, -1, -1, -1, -1 };
float dur[] = { 3, 0, 0, 0, 3, 0, 0, 0, 3, 0, 0, 0, 3, 0, 0, 0 }; float dur[] = { 2, 0, 2, 0, 2, 0, 2, 0, 2, 0, 2, 0, 2, 0, 2, 0 };
int phrase = 16; int phrase = 16;
@ -43,7 +43,7 @@ void setup() {
//OCR1A = 15624;// = (16*10^6) / (1*1024) - 1 (must be <65536) //OCR1A = 15624;// = (16*10^6) / (1*1024) - 1 (must be <65536)
//OCR1A = 7812;// = (16*10^6) / (1*1024) - 1 (must be <65536) //OCR1A = 7812;// = (16*10^6) / (1*1024) - 1 (must be <65536)
//OCR1A = 15624; //OCR1A = 15624;
OCR1A = 31248; OCR1A = 48000;
// turn on CTC mode // turn on CTC mode
TCCR1B |= (1 << WGM12); TCCR1B |= (1 << WGM12);
// Set CS10 and CS12 bits for 1024 escaler // Set CS10 and CS12 bits for 1024 escaler

View File

@ -0,0 +1,88 @@
// Basic demo for configuring the MCP4728 4-Channel 12-bit I2C DAC
#include <Adafruit_MCP4728.h>
#include <Wire.h>
Adafruit_MCP4728 mcp;
// idea behind this - sequence a cloud of gate events
float hexany[] = { 0.12928301694496647, 0.32192809488736235, 0.3923174227787603, 0.5849625007211562, 0.8073549220576041, 0.9068905956085185 };
float tuning[18];
int chord[10] = { 0, 2, 4, 6, 8, 7, 11, 15, 14, 10 };
int bpm = 60;
float beat_s = 60.0 / (float)bpm;
int beat_m = round(1000.0 * beat_s);
float mod_b = 3.141592653589793 / 4.0;
float voltrange = 4.85; // measured this, probably not accurate
float octave = 4096.0 / voltrange; // number of DAC steps in an octave
int gate = 0;
int gatel = 1000;
int tick = 16;
long init_t;
float p_gate = 0.0;
void setup(void) {
Serial.begin(115200);
while (!Serial)
delay(10); // will pause Zero, Leonardo, etc until serial console opens
if (!mcp.begin(0x64)) {
Serial.println("Failed to find MCP4728 chip");
while (1) {
delay(10);
}
Serial.println("MCP4728 initialised");
}
float n0 = 0;
for( int o = 0; o < 3; o++ ) {
for( int i = 0; i < 18; i++ ) {
tuning[o * 6 + i] = round(n0 + octave * (o + hexany[i]));
}
}
init_t = millis();
mcp.setChannelValue(MCP4728_CHANNEL_B, 0);
}
void loop() {
int note;
int k = 0;
if( gate > 0 ) {
gate--;
if( gate == 0 ) {
mcp.setChannelValue(MCP4728_CHANNEL_B, 0);
}
} else {
long now = millis();
long mod_t = now - init_t;
tick--;
if( tick == 0 ) {
tick = 32;
p_gate = sin(mod_b * (float)mod_t / (float)beat_m);
}
if( (float)random(10000) / 20.0 < abs(p_gate)) {
if( p_gate > 0 ) {
note = random(5);
} else {
note = 5 + random(5);
}
mcp.setChannelValue(MCP4728_CHANNEL_B, 4095);
mcp.setChannelValue(MCP4728_CHANNEL_A, tuning[note]);
gate = gatel;
}
}
}

View File

@ -0,0 +1,109 @@
// can fibomod make an interesting noise?
#include <Adafruit_MCP4728.h>
#include <Wire.h>
Adafruit_MCP4728 mcp;
#define nsamp 1500
#define dacmax 256
unsigned int phase = 0;
unsigned int fibo = 3;
unsigned int scale = 0;
unsigned int fibi = 0;
unsigned int gate = 4095;
unsigned int pmax = nsamp;
unsigned int beat = 0;
unsigned int fibosort[] = { 4,3,11,8,29,7,21,19,38,76,5,55,199,6,9,12,16,18,24,36,48,72,144,13,22,31,44,62,124,47,141,17,34,68,136,152,15,33,41,123,165,205,58,116,211,89,139,14,23,28,32,42,46,56,63,69,84,92,96,112,126,138,161,168,184,207,224,252,101,151,233,39,87,59,10,20,40,61,88,110,122,155,220,244,248,71,27,51,54,57,102,107,108,114,153,171,204,214,216,228,37,113,79,158,35,77,105,231,26,52,104,232,43,129,181,209,64,94,188,192,25,53,106,109,212,218,121,49,91,147,203,229,30,45,60,66,80,82,90,93,99,120,132,164,176,180,183,186,198,240,246,131,178,67,201,65,143,145,119,133,189,238,73,149,202,111,235,78,83,117,156,166,174,208,234,249,118,236,179,85,95,170,187,190,191,128,97,75,103,142,81,159,162,74,148,226,177,239,70,115,140,154,160,210,217,230,241,253,251,221,247,127,86,172,137,195,213,219,50,100,200,237,157,163,242,98,167,182,196,173,135,255,169,185,193,197,175,134,130,215,146,223,222,227,125,245,194,150,225,206,243,254,250 };
byte waveform[nsamp];
void setup() {
cli();
//set timer1 interrupt at 1Hz
TCCR1A = 0;// set entire TCCR1A register to 0
TCCR1B = 0;// same for TCCR1B
TCNT1 = 0;//initialize counter value to 0
// set compare match register for 1hz increments
//OCR1A = 15624;// = (16*10^6) / (1*1024) - 1 (must be <65536)
//OCR1A = 7812;// = (16*10^6) / (1*1024) - 1 (must be <65536)
OCR1A = 3200;
// turn on CTC mode
TCCR1B |= (1 << WGM12);
// Set CS10 and CS12 bits for 1024 prescaler
TCCR1B |= (1 << CS12) | (1 << CS10);
// enable timer compare interrupt
TIMSK1 |= (1 << OCIE1A);
sei();
Serial.begin(115200);
if (!mcp.begin(0x64)) {
while (1) {
delay(100);
}
}
mcp.setSpeed(800000L);
for( int i = 0; i < nsamp; i++ ) {
waveform[i] = 1;
}
fibi = 3;
fibo = 3; //fibosort[fibi];
setwave();
}
void setwave(){
waveform[0] = 0;
waveform[1] = 1;
fibo = fibi; // fibosort[fibi];// + 3;
pmax = nsamp;
for (int i=2; i<nsamp; ++i){
waveform[i] = (waveform[i - 1] + waveform[i - 2]) % fibo;
if( waveform[i - 1] == 0 && waveform[i] == 1 ) {
pmax = i - 1;
break;
}
}
float scale = 256 / fibo;
for( int i = 0; i < nsamp; ++i ) {
waveform[i] *= scale;
}
}
ISR(TIMER1_COMPA_vect){//timer1
fibi++;
if( fibi == 67 ) {
fibi = 3;
}
setwave();
phase = 0;
beat++;
if ( beat == 4 ) {
gate = 4095;
beat = 0;
}
}
void loop() {
mcp.fastWrite(waveform[phase] << 4, gate, 0, 0);
phase += 1;
if( phase == pmax ) {
phase = 0;
gate = 0;
}
}