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9542bbee1a
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8c983f187b
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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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// idea behind this - sequence a cloud of gate events
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// 1 3 5 7 hexany log2
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int bpm = 135;
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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 mod_b = 3.141592653589793 / 4.0;
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int gate = 0;
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int gatel = 1000;
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int tick = 16;
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long init_t;
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float p_gate = 0.0;
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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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init_t = millis();
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mcp.setChannelValue(MCP4728_CHANNEL_B, 0);
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}
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void loop() {
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if( gate > 0 ) {
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gate--;
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if( gate == 0 ) {
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mcp.setChannelValue(MCP4728_CHANNEL_B, 0);
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}
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} else {
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long now = millis();
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long mod_t = now - init_t;
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tick--;
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if( tick == 0 ) {
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tick = 16;
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p_gate = sin(mod_b * (float)mod_t / (float)beat_m);
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}
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if( (float)random(10000) / 100.0 < abs(p_gate)) {
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mcp.setChannelValue(MCP4728_CHANNEL_B, 4095);
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gate = gatel;
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}
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}
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}
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@ -1,104 +0,0 @@
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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 tuning[22];
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// bassline
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//int pitch[] = { 1, 2, -1, 0, -1, 1, -1, 0, -1, 1, -1 };
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//float dur[] = { 0.25, 0.25, 0.5, 0.25, 0.5, 0.25, 0.5, 0.25, 0.5, 0.25, 0.5 };
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// kick
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//int pitch[] = { 1, -1, 1, -1, 1, -1, 1, -1, 1 };
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//float dur[] = { 0.25, 0.75, 0.25, 0.75, 0.25, 0.75, 0.25, 0.75};
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int pitch[] = { 9, 7, 5, 3, 8, 6, 5, 3 };
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float dur[] = { 0.5, 0.5, 0.5, 0.5, 0.5, 0.5, 0.5, 0.5 };
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float gate = 0.25;
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int bpm = 140;
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int phrase = 8;
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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 i = 0; i < 22; i++ ) {
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tuning[i] = round(n0 + octave * (float)i / 7.0);
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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 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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@ -1,49 +0,0 @@
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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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int bpm = 98;
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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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long init_t;
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float pi = 3.141592653589793;
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float mod_a = pi;
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float mod_b = pi / 4.0;
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float mod_c = pi / 3.0;
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float mod_d = pi / 5.0;
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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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init_t = millis();
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mcp.setChannelValue(MCP4728_CHANNEL_B, 0);
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}
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void loop() {
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long now = millis();
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long mod_t = (now - init_t);
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float tf = (float)mod_t / (float)beat_m;
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uint16_t a = round(4095.0 * (0.5 + 0.5 * sin(mod_a * tf)));
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uint16_t b = round(4095.0 * (0.5 + 0.5 * sin(mod_b * tf)));
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uint16_t c = round(4095.0 * (0.5 + 0.5 * sin(mod_c * tf)));
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uint16_t d = round(4095.0 * (0.5 + 0.5 * sin(mod_d * tf)));
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mcp.fastWrite(a, b, c, d);
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}
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@ -1,93 +0,0 @@
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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[] = { 256, 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, -1, -1, -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 = 800;
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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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14
TODO.md
14
TODO.md
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@ -2,10 +2,10 @@
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Sunday 6 October
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s 6 - Wavetable updates
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m 7 - Change a sequence while it's playing
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t 8 - Sound clouds
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w 9 - 7TET groove
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t 10 - Drum pattern
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f 11 - FM
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s 12 - Karplus-Strong
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6 - Wavetable updates
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7 - Change a sequence while it's playing
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8 - Sound clouds
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9 - 7TET groove
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10 - Drum pattern
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11 - FM
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12 - Karplus-Strong
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