Added arduino code

main-code/.theia/launch.json

@@ -0,0 +1,8 @@
+{
+  // Use IntelliSense to learn about possible attributes.
+  // Hover to view descriptions of existing attributes.
+  "version": "0.2.0",
+  "configurations": [
+  
+  ]
+}

main-code/main-code.ino

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+int output1 = 2;
+int output2 = 3;
+int output3 = 4;
+int output4 = 5;
+
+
+int freq;
+float finaldelay = (1248000/freq)/16;
+
+#define NOP __asm__ __volatile__ ("nop\n\t")
+#define HI_NIBBLE(b) (((b) >> 4) & 0x0F)
+#define LO_NIBBLE(b) ((b) & 0x0F)
+
+byte hival;
+byte loval;
+
+float volume = 15;
+byte vol;
+
+float x = 0;
+int y = 0;
+
+const byte outPins = 4;
+byte pins[] = {2, 3, 4, 5};
+float sinfunct[16];
+
+void setup() {
+  pinMode(LED_BUILTIN, OUTPUT);
+  pinMode(output1, OUTPUT);
+  pinMode(output2, OUTPUT);
+  pinMode(output3, OUTPUT);
+  pinMode(output4, OUTPUT);
+  for (int i = 0; i <= 15; i++) { // Pre-generate the waveform to avoid processing in loop
+    volume = cos(x) * 7.999 + 7.999;
+    sinfunct[i] = volume;
+    x = x + (PI / 8);
+    if ( x >= TWO_PI ) { x = 0; };
+  }
+  Serial.begin(2000000);
+  freq = (900000/44100)*6;
+}
+
+void setup1() {
+  pinMode(LED_BUILTIN, OUTPUT);
+  digitalWrite(LED_BUILTIN, HIGH);
+  delay(500);
+  digitalWrite(LED_BUILTIN, LOW);
+}
+
+void loop1() {
+  rp2040.fifo.pop();
+  digitalWrite(LED_BUILTIN, HIGH);
+  delay(500);
+  digitalWrite(LED_BUILTIN, LOW);
+  delay(500);
+}
+
+void loop() {
+  if (Serial.available() > 0) {
+    vol = Serial.read() >> 4;
+    rp2040.fifo.push_nb(1);
+  }
+  digitalWrite(2, bitRead(vol, 0));
+  digitalWrite(3, bitRead(vol, 1));
+  digitalWrite(4, bitRead(vol, 2));
+  digitalWrite(5, bitRead(vol, 3));
+  for(int i = 0; i < freq; i++){
+    NOP;
+  }
+}