init

ardi-seq.ino

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+/*
+Blink
+
+Turns an LED on for one second, then off for one second, repeatedly.
+
+Most Arduinos have an on-board LED you can control. On the UNO, MEGA and ZERO
+it is attached to digital pin 13, on MKR1000 on pin 6. LED_BUILTIN is set to
+the correct LED pin independent of which board is used.
+If you want to know what pin the on-board LED is connected to on your Arduino
+model, check the Technical Specs of your board at:
+https://www.arduino.cc/en/Main/Products
+
+modified 8 May 2014
+by Scott Fitzgerald
+modified 2 Sep 2016
+by Arturo Guadalupi
+modified 8 Sep 2016
+by Colby Newman
+
+This example code is in the public domain.
+
+https://www.arduino.cc/en/Tutorial/BuiltInExamples/Blink
+*/
+#include <Arduino.h>
+#include <SoftwareSerial.h>
+#include <avr/interrupt.h>
+#include <avr/io.h>
+
+SoftwareSerial midi_uart(10, 11); // RX, TX
+
+const double bpm = 140.0;
+const int led1_pin = 7;
+const int led2_pin = 9;
+const int ext_clock_pin = 5;
+unsigned int reload = 0xF424;
+volatile unsigned long count = 0;
+volatile int state = HIGH;
+int md_notes[16] = {36, 38, 40, 41, 43, 45, 47, 48,
+                    50, 52, 53, 55, 57, 59, 60, 62};
+volatile unsigned long count_last[8] = {0, 0, 0, 0, 0, 0, 0, 0};
+
+void flash1() {
+  static boolean output = HIGH;
+  digitalWrite(led1_pin, output);
+  output = !output;
+}
+
+void flash2() {
+  static boolean output = HIGH;
+  digitalWrite(led1_pin, output);
+  output = !output;
+}
+
+void ext_clock_pulse() { flash2(); }
+
+void setup() {
+  // Console
+  Serial.begin(115200);
+
+  // LED
+  pinMode(led1_pin, OUTPUT);
+  digitalWrite(led1_pin, LOW);
+  pinMode(led2_pin, OUTPUT);
+  digitalWrite(led2_pin, LOW);
+
+  // BUT
+  pinMode(ext_clock_pin, INPUT_PULLUP);
+  attachInterrupt(digitalPinToInterrupt(ext_clock_pin), ext_clock_pulse,
+                  CHANGE);
+
+  midi_uart.begin(31250);
+  cli();
+  TCCR1A = 0;
+  TCCR1B = 0;
+  OCR1A = reload;
+  //  TCCR1B = (1 << WGM12) | (1 << CS11); // SLOW
+  TCCR1B = (1 << WGM12) | (1 << CS10); // FAST
+  TIMSK1 = (1 << OCIE1A);
+  sei();
+  //  Serial.println("TIMER1 Setup Finished.");
+}
+
+int div_to_clk(float div) {
+  double clk_pulse_per_second = 40.;
+  double beat_per_bar = 4.;
+  double bar_ns = 60. / bpm * beat_per_bar * clk_pulse_per_second;
+  double d_c = bar_ns / div;
+  return d_c;
+}
+
+void noteOn(int cmd, int pitch, int velocity) {
+  midi_uart.write(cmd);
+  midi_uart.write(pitch);
+  midi_uart.write(velocity);
+}
+
+// void subdiv(unsigned int count, unsigned int div, unsigned int md_note_nr) {
+//   if (count % div == 0) {
+//     noteOn(0x90, md_notes[md_note_nr], 0x64);
+//   }
+// }
+void subdiv(unsigned int count, unsigned int div, unsigned int md_note_nr) {
+  if (count >= count_last[div] + div_to_clk(div)) {
+    count_last[div] = count;
+    noteOn(0x90, md_notes[md_note_nr], 0x64);
+  }
+}
+
+ISR(TIMER1_COMPA_vect) {
+  count++;
+  //  flash1();
+
+  for (int i = 0; i < 8; i++) {
+    subdiv(count, i + 1, i);
+  }
+}
+
+void loop() {
+  Serial.println(count); // do anything
+  delay(200);
+  //  digitalWrite(LED_pin, state);
+  //  // play notes from F#-0 (0x1E) to F#-5 (0x5A):
+  //  for (int note = 0x1E; note < 0x5A; note++) {
+  //    // Note on channel 1 (0x90), some note value (note), middle velocity
+  //    (0x45): noteOn(0x90, note, 0x45); delay(1000);
+  //    // Note on channel 1 (0x90), some note value (note), silent velocity
+  //    (0x00): noteOn(0x90, note, 0x00); delay(100);
+  //  }
+}

build.sh

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+arduino-cli compile -v --fqbn arduino:avr:micro
+arduino-cli upload -v --fqbn arduino:avr:micro -p /dev/cu.usbserial-11220
+