From c2e6b73722f0d631bc33d7fcf2305d8b14ba6087 Mon Sep 17 00:00:00 2001
From: Tomas Mudrunka <tomas@mudrunka.cz>
Date: Mon, 1 Feb 2021 23:54:06 +0100
Subject: [PATCH] Mozzi ADSR

---
 .../MIDIUSB_Mozzi_adsr/MIDIUSB_Mozzi_adsr.ino | 122 ++++++++++++++++++
 1 file changed, 122 insertions(+)
 create mode 100644 arduino/MIDIUSB_Mozzi_adsr/MIDIUSB_Mozzi_adsr.ino

diff --git a/arduino/MIDIUSB_Mozzi_adsr/MIDIUSB_Mozzi_adsr.ino b/arduino/MIDIUSB_Mozzi_adsr/MIDIUSB_Mozzi_adsr.ino
new file mode 100644
index 0000000..43a5288
--- /dev/null
+++ b/arduino/MIDIUSB_Mozzi_adsr/MIDIUSB_Mozzi_adsr.ino
@@ -0,0 +1,122 @@
+/*
+ * MIDIUSB_buzzer.ino
+ *
+ * Author: Paulo Costa
+ */ 
+
+#include <MozziGuts.h>
+#include <MIDIUSB.h>
+#include <pitchToFrequency.h>
+#include <Oscil.h> // oscillator template
+#include <tables/sin2048_int8.h> // sine table for oscillator
+#include <mozzi_midi.h>
+#include <ADSR.h>
+
+// use: Oscil <table_size, update_rate> oscilName (wavetable), look in .h file of table #included above
+Oscil <SIN2048_NUM_CELLS, AUDIO_RATE> aSin(SIN2048_DATA);
+
+ADSR <CONTROL_RATE, AUDIO_RATE> envelope;
+
+const char* pitch_name(byte pitch) {
+  static const char* names[] = {"C", "C#", "D", "D#", "E", "F", "F#", "G", "G#", "A", "A#", "B"};
+  return names[pitch % 12];
+}
+
+int pitch_octave(byte pitch) {
+  return (pitch / 12) - 1;
+}
+
+void noteOn(byte channel, byte pitch, byte velocity) {
+  aSin.setFreq(pitchFrequency[pitch]); 
+  envelope.noteOn();
+
+  Serial.print("Note On: ");
+  Serial.print(pitch_name(pitch));
+  Serial.print(pitch_octave(pitch));
+  Serial.print(", channel=");
+  Serial.print(channel);
+  Serial.print(", velocity=");
+  Serial.println(velocity);
+}
+
+void noteOff(byte channel, byte pitch, byte velocity) {
+  //aSin.setFreq(0);
+  envelope.noteOff();
+
+  Serial.print("Note Off: ");
+  Serial.print(pitch_name(pitch));
+  Serial.print(pitch_octave(pitch));
+  Serial.print(", channel=");
+  Serial.print(channel);
+  Serial.print(", velocity=");
+  Serial.println(velocity);
+}
+
+void controlChange(byte channel, byte control, byte value) {
+  Serial.print("Control change: control=");
+  Serial.print(control);
+  Serial.print(", value=");
+  Serial.print(value);
+  Serial.print(", channel=");
+  Serial.println(channel);
+}
+
+void setup() {
+  Serial.begin(115200);
+    envelope.setADLevels(255,48);
+  envelope.setTimes(150,200,700,200); // 700 is so the note will sustain 0.7 seconds unless a noteOff comes
+
+  aSin.setFreq(440); // default frequency
+   startMozzi(CONTROL_RATE);
+}
+void updateControl(){
+  envelope.update();
+}
+
+
+AudioOutput_t updateAudio(){
+  return MonoOutput::from16Bit(envelope.next() * aSin.next()); // return an int signal centred around 0
+}
+
+void loop() {
+  audioHook(); 
+  midiEventPacket_t rx = MidiUSB.read();
+  switch (rx.header) {
+    case 0:
+      break; //No pending events
+      
+    case 0x9:
+      noteOn(
+        rx.byte1 & 0xF,  //channel
+        rx.byte2,        //pitch
+        rx.byte3         //velocity
+      );
+      break;
+      
+    case 0x8:
+      noteOff(
+        rx.byte1 & 0xF,  //channel
+        rx.byte2,        //pitch
+        rx.byte3         //velocity
+      );
+      break;
+      
+    case 0xB:
+      controlChange(
+        rx.byte1 & 0xF,  //channel
+        rx.byte2,        //control
+        rx.byte3         //value
+      );
+      break;
+      
+    default:
+      Serial.print("Unhandled MIDI message: ");
+      Serial.print(rx.header, HEX);
+      Serial.print("-");
+      Serial.print(rx.byte1, HEX);
+      Serial.print("-");
+      Serial.print(rx.byte2, HEX);
+      Serial.print("-");
+      Serial.println(rx.byte3, HEX);
+  }
+}
-- 
2.30.2