Added source code for first week
Mike Lynch
parent
ddad5492e1
commit
4515ad9fdb
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// Basic demo for configuring the MCP4728 4-Channel 12-bit I2C DAC
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#include <Adafruit_MCP4728.h>
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#include <Wire.h>
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Adafruit_MCP4728 mcp;
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float xlog = 0.5;
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float r = 3.783423;
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void setup(void) {
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Serial.begin(115200);
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while (!Serial)
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delay(10); // will pause Zero, Leonardo, etc until serial console opens
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Serial.println("Adafruit MCP4728 test!");
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// Try to initialize!
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if (!mcp.begin(0x64)) {
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Serial.println("Failed to find MCP4728 chip");
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while (1) {
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delay(10);
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}
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}
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mcp.setChannelValue(MCP4728_CHANNEL_A, 4095);
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mcp.setChannelValue(MCP4728_CHANNEL_B, 2048);
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mcp.setChannelValue(MCP4728_CHANNEL_C, 1024);
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mcp.setChannelValue(MCP4728_CHANNEL_D, 0);
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}
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void loop() {
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int pot = analogRead(A0);
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r = (float)pot / 1024.0 + 3.0;
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xlog = r * xlog * (1 - xlog);
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int cv = round(xlog * 4095.0);
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mcp.setChannelValue(MCP4728_CHANNEL_A, cv);
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delay(100);
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}
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// Basic demo for configuring the MCP4728 4-Channel 12-bit I2C DAC
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#include <Adafruit_MCP4728.h>
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#include <Wire.h>
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Adafruit_MCP4728 mcp;
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// 1 3 5 7 hexany log2
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float hexany[] = { 0.12928301694496647, 0.32192809488736235, 0.3923174227787603, 0.5849625007211562, 0.8073549220576041, 0.9068905956085185 };
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float tuning[18];
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//int pitch[] = { -1, 6, 4, -1, 6, 5 };
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//float dur[] = { 2, 1, 1, 2, 1, 1 };
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//int pitch[] = { 4, -1, 4, -1 };
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//float dur[] = { 2, 2, 2, 2 };
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int pitch[] = { 2, 4, 5, 3, 4, 5, 2, 3, 3, 4, 5, 2, 4, 3, 5 ,2 };
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float dur[] = { 0.25, 0.25, 0.25, 0.25, 0.25, 0.25, 0.25, 0.25, 0.25, 0.25, 0.25, 0.25, 0.25, 0.25, 0.25, 0.25 };
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float gate = 0.5;
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int bpm = 167;
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int phrase = 16;
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float beat_s = 60.0 / (float)bpm;
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int beat_m = round(1000.0 * beat_s);
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float voltrange = 4.85; // measured this, probably not accurate
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float octave = 4096.0 / voltrange; // number of DAC steps in an octave
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float mod_b = 3.141592653589793 / 4.0;
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int s;
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bool noteon = false;
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long play_t;
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long release_t;
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long last_t;
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long init_t;
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void setup(void) {
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Serial.begin(115200);
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while (!Serial)
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delay(10); // will pause Zero, Leonardo, etc until serial console opens
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if (!mcp.begin(0x64)) {
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Serial.println("Failed to find MCP4728 chip");
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while (1) {
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delay(10);
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}
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Serial.println("MCP4728 initialised");
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}
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mcp.setChannelValue(MCP4728_CHANNEL_B, 0);
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float n0 = 0;
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for( int o = 0; o < 3; o++ ) {
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for( int i = 0; i < 18; i++ ) {
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tuning[o * 6 + i] = round(n0 + octave * (o + hexany[i]));
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}
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}
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s = 0;
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release_t = 0;
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play_t = 0;
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last_t = millis();
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init_t = last_t;
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}
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void make_tuning() {
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float n0 = 0;
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for( int i = 0; i < 18; i++ ) {
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tuning[i] = round(n0 + octave * hexany[i]);
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}
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}
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void loop() {
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long now = millis();
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if( noteon ) {
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if( now - last_t > release_t ) {
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noteOff();
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last_t = now;
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play_t = round(beat_m * dur[s] * (1.0 - gate));
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noteon = false;
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s += 1;
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if( s == phrase ) {
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s = 0;
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}
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}
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} else {
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if( now - last_t > play_t ) {
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noteOn(pitch[s]);
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last_t = now;
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release_t = round(beat_m * dur[s] * gate);
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noteon = true;
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}
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}
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// sychronise this better
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long mod_t = (now - init_t);
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float mod = 0.5 + 0.5 * sin(mod_b * (float)mod_t / (float)beat_m);
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mcp.setChannelValue(MCP4728_CHANNEL_C, round(4095.0 * mod));
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}
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void noteOn(int note) {
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if( note > -1 ) {
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mcp.setChannelValue(MCP4728_CHANNEL_A, tuning[note]);
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mcp.setChannelValue(MCP4728_CHANNEL_B, 4095);
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}
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}
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void noteOff() {
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mcp.setChannelValue(MCP4728_CHANNEL_B, 0);
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}
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// Very basic Karplus-Strong
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// based on this explanation http://sites.music.columbia.edu/cmc/MusicAndComputers/chapter4/04_09.php
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#include <Adafruit_MCP4728.h>
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#include <Wire.h>
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Adafruit_MCP4728 mcp;
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#define nsamp 256
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#define dacmax 256
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unsigned int phase;
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unsigned int length;
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unsigned int repeats;
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int note = 0;
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//int freqs[] = { 64, 56, 51, 48, 42, 38, 34, 32, 28, 25, 24, 21, 19, 17, 16 };
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//int tune2[] = { 2, -1, -1, 2, -1, -1, 3, -1, 2, -1, -1, -1, 0, -1, -1, -1 };
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//int tune2[] = { 2, -1, -1, -1, -1, -1, -1, -1, 2, -1, -1, -1, 4, -1, -1, -1 };
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int freqs[] = { 128, 112, 102, 96, 84, 76, 64, 56, 50, 48, 42, 38, 34, 32 };
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int tune2[] = { 0, -1, -1, -1, -1, -1, -1, -1, 2, -1, -1, -1, -1, -1, -1, -1 };
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byte waveform[nsamp];
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int pd = 30;
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void setup() {
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cli();
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//set timer1 interrupt at 1Hz
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TCCR1A = 0;// set entire TCCR1A register to 0
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TCCR1B = 0;// same for TCCR1B
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TCNT1 = 0;//initialize counter value to 0
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// set compare match register for 1hz increments
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//OCR1A = 15624;// = (16*10^6) / (1*1024) - 1 (must be <65536)
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//OCR1A = 7812;// = (16*10^6) / (1*1024) - 1 (must be <65536)
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OCR1A = 2000;
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// turn on CTC mode
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TCCR1B |= (1 << WGM12);
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// Set CS10 and CS12 bits for 1024 escaler
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TCCR1B |= (1 << CS12) | (1 << CS10);
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// enable timer compare interrupt
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TIMSK1 |= (1 << OCIE1A);
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sei();
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if (!mcp.begin(0x64)) {
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while (1) {
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delay(100);
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}
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}
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randomSeed(analogRead(A0));
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mcp.setSpeed(800000L);
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phase=0;
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note=0;
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}
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ISR(TIMER1_COMPA_vect){//timer1
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if( tune2[note] > -1 ) {
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length=freqs[tune2[note]];
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for (int i=0; i<nsamp; ++i){
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waveform[i]=random(256);
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}
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}
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note++;
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if( note > 15 ) {
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note = 0;
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}
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pd = analogRead(A0) >> 4;
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}
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void loop() {
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byte s1, s2;
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int p0 = phase;
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int p1 = phase - pd;
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if( p1 < 0 ) {
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p1 += length;
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}
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phase += 1;
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if( phase >= length ) {
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phase = 0;
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}
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s1 = waveform[p1];
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s2 = waveform[p0];
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waveform[p0] = ( s1 & s2 ) + ((s1 ^ s2) >> 1);
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mcp.fastWrite(s1 << 4, 0, 0, 0);
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}
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@ -0,0 +1,128 @@
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//waveform generator
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// hacked from https://www.instructables.com/Arduino-Waveform-Generator-1/
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#include <Adafruit_MCP4728.h>
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#include <Wire.h>
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Adafruit_MCP4728 mcp;
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#define nsamp 32
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#define dacmax 256
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const byte nclk = 200; // a guess
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long int freq; //frequency in Hz
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long unsigned int phase;
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long unsigned int phase_inc;
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int note = 0;
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int gate;
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int decay = 128;
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float pattern[16];
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long unsigned int pattern_inc[4];
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void setup() {
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TIMSK0 &= ~_BV(TOIE0); // disable timer0 overflow interrupt
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cli();
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//set timer1 interrupt at 1Hz
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TCCR1A = 0;// set entire TCCR1A register to 0
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TCCR1B = 0;// same for TCCR1B
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TCNT1 = 0;//initialize counter value to 0
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// set compare match register for 1hz increments
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OCR1A = 3905;// = (16*10^6) / (1*1024) - 1 (must be <65536)
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// turn on CTC mode
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TCCR1B |= (1 << WGM12);
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// Set CS10 and CS12 bits for 1024 prescaler
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TCCR1B |= (1 << CS12) | (1 << CS10);
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// enable timer compare interrupt
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TIMSK1 |= (1 << OCIE1A);
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sei();
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Serial.begin(115200);
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if (!mcp.begin(0x64)) {
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while (1) {
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delay(100);
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}
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}
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// mcp.setSpeed(400000L);
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// mcp.setSpeed(800000L);
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mcp.setSpeed(800000L);
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freq=440;
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phase=0;
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//pattern[0] = 220.0;
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// pattern[1] = 261.6255653005987;
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// pattern[2] = 369.9944227116345;
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// pattern[3] = 391.9954359817495;
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for( int i = 0; i < 4; i++ ) {
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pattern[i] = 0;
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}
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for( int i = 4; i < 6; i++ ) {
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pattern[i] = 659.2551138257401;
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}
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for( int i = 6; i < 8; i++ ) {
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pattern[i] = 493.8833012561241;
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}
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for( int i = 8; i < 16; i++ ) {
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pattern[i] = 0;
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}
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for( int i = 0; i < 16; i++ ) {
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pattern_inc[i] = pattern[i] * 975592.231884058;
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}
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setwave();
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}
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const float pi=3.14159265;
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byte waveform[nsamp];
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byte phaseb = 0;
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void setwave(){
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for (int isamp=0; isamp<nsamp; ++isamp){
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float phip=(isamp+0.5)/nsamp;
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float phi=2*pi*phip;
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int val=0;
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//saw
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val = dacmax * isamp / nsamp;
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//val = ( isamp < nsamp / 2 ) ? 0 : dacmax - 1;
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//sine
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//val=(sin(phi)+1.0)*dacmax/2;
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//val=((sin(phi)+0.333*sin(3*phi))/0.943+1)*dacmax/2;
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val=max(val,0);
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val=min(val,dacmax-1);
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waveform[isamp]=val;
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}
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}
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ISR(TIMER1_COMPA_vect){
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note += 1;
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if( note > 15 ) {
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note = 0;
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}
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phase_inc = pattern_inc[note];
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gate = 4095;
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}
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void loop() {
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phase += phase_inc;
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int redphase = phase >> 27;
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mcp.fastWrite(waveform[redphase] << 4, gate, 0, 0);
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if( gate > 0 ) {
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gate -= decay;
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}
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}
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@ -1,168 +0,0 @@
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// We Wish You a Merry Christmas
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#include <Adafruit_MCP4728.h>
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#include <Wire.h>
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Adafruit_MCP4728 mcp;
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float tuning[16];
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// 0 = A, 8 = F (tonic)
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int m1[] = { 3, 8, 8, 10, 8, 7, 5, 5, 5, 10, 10, 12, 10, 8, 7, 3, 7, 12, 12, 13, 12, 10, 8, 5, 3, 3, 5, 10, 7, 8, 3, 8, 8, 8, 7, 7, 8, 7, 5, 3, 10, 12, 10, 10, 8, 8, 15, 3, 3, 3, 5, 10, 7, 8 };
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int s1[] = { 0, 2, 4, 5, 6, 7, 8, 10, 12, 14, 16, 17, 18, 19, 20, 22, 24, 26, 28, 29, 30, 31, 32, 34, 36, 37, 38, 40, 42, 44, 48, 50, 52, 54, 56, 60, 62, 64, 66, 68, 72, 74, 76, 77, 78, 79, 80, 82, 84, 85, 86, 88, 90, 92 };
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float d1[] = { 2, 1, 1, 1, 1, 1, 2, 1, 2, 1, 1, 1, 1, 1, 2, 1, 2, 1, 1, 1, 1, 1, 2, 2, 1, 1, 2, 2, 2, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 4 };
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int m2[] = { 8, 1, 2, 3, 4, 5, 0, 1, 3, 8, 8, 3, 5, 7, 8, 7, 0, 1, 3, 8 };
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int s2[] = { 2, 8, 14, 20, 26, 32, 36, 38, 42, 44, 50, 56, 62, 68, 74, 80, 84, 86, 90, 92 };
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float d2[] = { 6, 6, 6, 6, 6, 4, 2, 4, 2, 6, 6, 6, 6, 6, 6, 4, 2, 4, 2, 4 };
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// int m1[] = { 0, 2, 4, 5, 7, 9, 11, 12 };
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// int s1[] = { 0, 2, 4, 6, 8, 10, 12, 14 };
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// float d1[] = { 1.0, 0.5, 1.0, 0.5, 1.0, 0.5, 1.0, 0.5 };
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// int m2[] = { 0, 4, 7, 12, 0, 4, 7, 12, 0, 4, 7, 12, 0, 4, 7, 12 };
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// int s2[] = { 0, 1 , 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 };
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// 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, 0.5, 0.5, 0.5 };
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float gate = 0.5;
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int bpm = 320;
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float beat_s = 60.0 / (float)bpm;
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int beat = round(1000.0 * beat_s);
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// count_in = number of beats since t0 to wait before we startt playing
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// repeat = number of beats to repeat - could be computed from the sequence data
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// From here on, all times are in milliseconds to head off floating point errors
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long count_in = 4 * beat;
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int repeat = 96;
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float voltrange = 5.0;
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float octave = 4096.0 / voltrange; // number of DAC steps in an octave
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float mod_b = 3.141592653589793 / 4.0;
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typedef struct {
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int s = -1;
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bool playing = false;
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bool looped = false;
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long play = 0;
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long rel = 0;
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long last = 0;
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long init = 0;
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int *melody;
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int *start;
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float *duration;
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int len = 0;
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MCP4728_channel_t pitch;
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MCP4728_channel_t gate;
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} sequencer;
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sequencer seq1, seq2;
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long start_time;
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void setup(void) {
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Serial.begin(115200);
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while (!Serial)
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delay(10); // will pause Zero, Leonardo, etc until serial console opens
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if (!mcp.begin(0x64)) {
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Serial.println("Failed to find MCP4728 chip");
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while (1) {
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delay(10);
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}
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Serial.println("MCP4728 initialised");
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}
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float n0 = 0;
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for( int i = 0; i < 16; i++ ) {
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tuning[i] = round(n0 + octave * (float)i / 12.0);
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}
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long now = millis();
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||||
start_time = now;
|
||||
seq1.last = now;
|
||||
seq1.pitch = MCP4728_CHANNEL_A;
|
||||
seq1.gate = MCP4728_CHANNEL_B;
|
||||
seq1.melody = m1;
|
||||
seq1.start = s1;
|
||||
seq1.duration = d1;
|
||||
seq1.len = sizeof(m1) / sizeof(m1[0]);
|
||||
|
||||
times_to_ms(seq1);
|
||||
|
||||
seq2.last = now;
|
||||
seq2.pitch = MCP4728_CHANNEL_C;
|
||||
seq2.gate = MCP4728_CHANNEL_D;
|
||||
seq2.melody = m2;
|
||||
seq2.duration = d2;
|
||||
seq2.start = s2;
|
||||
seq2.len = sizeof(m2) / sizeof(m2[0]);
|
||||
|
||||
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] * 0.8;
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
|
||||
void loop() {
|
||||
long now = millis();
|
||||
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, long beats) {
|
||||
int next = seq.s + 1;
|
||||
int start;
|
||||
|
||||
if( seq.playing ) {
|
||||
if( now > seq.rel ) {
|
||||
mcp.setChannelValue(seq.gate, 0);
|
||||
seq.playing = false;
|
||||
}
|
||||
}
|
||||
|
||||
if( next > seq.len - 1 ) {
|
||||
seq.s = -1;
|
||||
seq.looped = true;
|
||||
return; // don't start the loop yet
|
||||
} else {
|
||||
start = seq.start[next];
|
||||
}
|
||||
|
||||
if( seq.looped ) { // reached the end and waiting for the start of the bar
|
||||
if( beats < seq.last ) {
|
||||
seq.looped = false; // bar has restarted, start waiting
|
||||
seq.s = -1;
|
||||
next = 0;
|
||||
} else {
|
||||
return;
|
||||
}
|
||||
}
|
||||
seq.last = beats;
|
||||
|
||||
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 = true;
|
||||
}
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue