Added 12 and 14

12SequencerII/12SequencerII.ino

@@ -0,0 +1,123 @@
+// Better sequencer which uses interrupts
+
+#include <Adafruit_MCP4728.h>
+#include <Wire.h>
+
+Adafruit_MCP4728 mcp;
+
+
+float tuning[37];
+float voltrange = 4.85;  // measured this, probably not accurate
+float octave = 4096.0 / voltrange; // number of DAC steps in an octave
+
+
+int note = 0;
+// int pitch[] = { 0, 1, 2, 3, 4, 5, 6, 7, 0, 1, 2, 3, 4, 5, 6, 7 };
+// float dur[] = { 1, 0.5, 0.25, 0.1, 1, 0.5, 0.25, 0.1,1, 0.5, 0.25, 0.1,1, 0.5, 0.25, 0.1 };
+
+int pitch[] = { 8, -1, -1, -1, -1,-1, -1, -1, -1,-1, 8, -1, -1, -1, -1, -1, };
+float dur[] = { 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1 };
+
+
+int phrase = 16;
+
+int s;
+int beat_m = 100; // fix me coordinate with timer code
+bool noteon = false;
+int beat = false;
+long notestart, notedur;
+
+
+void setup() {
+  Serial.begin(115200);
+
+
+  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 = 800;
+  // turn on CTC mode
+  TCCR1B |= (1 << WGM12);
+  // Set CS10 and CS12 bits for 1024 escaler
+  TCCR1B |= (1 << CS12) | (1 << CS10);  
+  // enable timer compare interrupt
+  TIMSK1 |= (1 << OCIE1A);
+
+  sei();
+
+
+
+  if (!mcp.begin(0x64)) {
+    while (1) {
+      delay(100);
+    }
+  }
+
+  // randomSeed(analogRead(A0));
+  mcp.setSpeed(800000L);
+  make_tuning(12);
+  note=0;
+  Serial.println("hello");
+}
+
+void make_tuning(int edo) {
+  float n0 = 0;
+  float edof = (float)edo;
+  for( int i = 0; i < 37; i++ ) {
+      tuning[i] = round(n0 + octave * (float)i / edof);
+  }
+
+}
+
+
+
+ISR(TIMER1_COMPA_vect){ // called once every note
+  beat = true;
+}
+
+
+
+void loop() {
+  long now = millis();
+  if( beat ) {
+    beat = false;
+    if( pitch[s] > -1 ) {
+      notestart = millis();
+      notedur = round(beat_m * dur[s]);
+      noteOn(pitch[s]);
+      noteon = true;
+    }
+    s += 1;
+    if( s == phrase ) {
+      s = 0;
+    }
+  } else {
+    if( noteon ) {
+      if( now - notestart > notedur ) {
+        noteOff();
+        noteon = false;
+      }
+    }
+  }
+}
+
+
+void noteOn(int note) {
+  if( note > -1 ) {
+    mcp.setChannelValue(MCP4728_CHANNEL_A, tuning[note]);
+    mcp.setChannelValue(MCP4728_CHANNEL_B, 4095);
+  }
+}
+
+void noteOff() {
+    Serial.println("off");
+    mcp.setChannelValue(MCP4728_CHANNEL_B, 0);
+}
+
+

14Slower/14Slower.ino

@@ -0,0 +1,125 @@
+// Better sequencer which uses interrupts
+
+#include <Adafruit_MCP4728.h>
+#include <Wire.h>
+
+Adafruit_MCP4728 mcp;
+
+
+float tuning[37];
+float voltrange = 4.85;  // measured this, probably not accurate
+float octave = 4096.0 / voltrange; // number of DAC steps in an octave
+
+
+int note = 0;
+
+// 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, };
+
+int pitch[] = { 1, -1, -1, -1, 1, -1, -1, -1, 1, -1, -1, -1, 0, -1, -1, -1  };
+float dur[] = { 3, 0, 0, 0, 3, 0, 0, 0, 3, 0, 0, 0, 3, 0, 0, 0 };
+
+
+int phrase = 16;
+
+int s;
+int beat_m = 1000; // fix me coordinate with timer code
+bool noteon = false;
+int beat = false;
+long notestart, notedur;
+
+
+void setup() {
+  Serial.begin(115200);
+
+
+  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 = 15624;
+  OCR1A = 31248;
+  // turn on CTC mode
+  TCCR1B |= (1 << WGM12);
+  // Set CS10 and CS12 bits for 1024 escaler
+  TCCR1B |= (1 << CS12) | (1 << CS10);  
+  // enable timer compare interrupt
+  TIMSK1 |= (1 << OCIE1A);
+
+  sei();
+
+
+
+  if (!mcp.begin(0x64)) {
+    while (1) {
+      delay(100);
+    }
+  }
+
+  // randomSeed(analogRead(A0));
+  mcp.setSpeed(800000L);
+  make_tuning(12);
+  note=0;
+  Serial.println("hello");
+}
+
+void make_tuning(int edo) {
+  float n0 = 0;
+  float edof = (float)edo;
+  for( int i = 0; i < 37; i++ ) {
+      tuning[i] = round(n0 + octave * (float)i / edof);
+  }
+
+}
+
+
+
+ISR(TIMER1_COMPA_vect){ // called once every note
+  beat = true;
+}
+
+
+
+void loop() {
+  long now = millis();
+  if( beat ) {
+    beat = false;
+    if( pitch[s] > -1 ) {
+      notestart = millis();
+      notedur = round(beat_m * dur[s]);
+      noteOn(pitch[s]);
+      noteon = true;
+    }
+    s += 1;
+    if( s == phrase ) {
+      s = 0;
+    }
+  } else {
+    if( noteon ) {
+      if( now - notestart > notedur ) {
+        noteOff();
+        noteon = false;
+      }
+    }
+  }
+}
+
+
+void noteOn(int note) {
+  if( note > -1 ) {
+    mcp.setChannelValue(MCP4728_CHANNEL_A, tuning[note]);
+    mcp.setChannelValue(MCP4728_CHANNEL_B, 4095);
+  }
+}
+
+void noteOff() {
+    Serial.println("off");
+    mcp.setChannelValue(MCP4728_CHANNEL_B, 0);
+}
+
+