pcb routing ready

FW/Leo_muziekdoos_fw/src/main.cpp

@@ -0,0 +1,166 @@
+// Arduino Zero / Feather M0 I2S audio tone generation example.
+// Author: Tony DiCola
+//
+// Connect an I2S DAC or amp (like the UDA1334A) to the Arduino Zero
+// and play back simple sine, sawtooth, triangle, and square waves.
+// Makes your Zero sound like a NES!
+//
+// NOTE: The I2S signal generated by the Zero does NOT have a MCLK /
+// master clock signal.  You must use an I2S receiver that can operate
+// without a MCLK signal (like the UDA1334A).
+//
+// For an Arduino Zero / Feather M0 connect it to you I2S hardware as follows:
+// - Digital 0 -> I2S LRCLK / FS (left/right / frame select clock)
+// - Digital 1 -> I2S BCLK / SCLK (bit / serial clock)
+// - Digital 9 -> I2S DIN / SD (data output)
+// - Ground
+//
+// Released under a MIT license: https://opensource.org/licenses/MIT
+#include "Adafruit_ZeroI2S.h"
+
+
+#define SAMPLERATE_HZ 44100  // The sample rate of the audio.  Higher sample rates have better fidelity,
+                             // but these tones are so simple it won't make a difference.  44.1khz is
+                             // standard CD quality sound.
+
+#define AMPLITUDE     ((1<<29)-1)   // Set the amplitude of generated waveforms.  This controls how loud
+                             // the signals are, and can be any value from 0 to 2**31 - 1.  Start with
+                             // a low value to prevent damaging speakers!
+
+#define WAV_SIZE      256    // The size of each generated waveform.  The larger the size the higher
+                             // quality the signal.  A size of 256 is more than enough for these simple
+                             // waveforms.
+
+
+// Define the frequency of music notes (from http://www.phy.mtu.edu/~suits/notefreqs.html):
+#define C4_HZ      261.63
+#define D4_HZ      293.66
+#define E4_HZ      329.63
+#define F4_HZ      349.23
+#define G4_HZ      392.00
+#define A4_HZ      440.00
+#define B4_HZ      493.88
+
+// Define a C-major scale to play all the notes up and down.
+float scale[] = { C4_HZ, D4_HZ, E4_HZ, F4_HZ, G4_HZ, A4_HZ, B4_HZ, A4_HZ, G4_HZ, F4_HZ, E4_HZ, D4_HZ, C4_HZ };
+
+// Store basic waveforms in memory.
+int32_t sine[WAV_SIZE]     = {0};
+int32_t sawtooth[WAV_SIZE] = {0};
+int32_t triangle[WAV_SIZE] = {0};
+int32_t square[WAV_SIZE]   = {0};
+
+// Create I2S audio transmitter object.
+Adafruit_ZeroI2S i2s;
+
+#define Serial Serial
+
+void generateSine(int32_t amplitude, int32_t* buffer, uint16_t length) {
+  // Generate a sine wave signal with the provided amplitude and store it in
+  // the provided buffer of size length.
+  for (int i=0; i<length; ++i) {
+    buffer[i] = int32_t(float(amplitude)*sin(2.0*PI*(1.0/length)*i));
+  }
+}
+void generateSawtooth(int32_t amplitude, int32_t* buffer, uint16_t length) {
+  // Generate a sawtooth signal that goes from -amplitude/2 to amplitude/2
+  // and store it in the provided buffer of size length.
+  float delta = float(amplitude)/float(length);
+  for (int i=0; i<length; ++i) {
+    buffer[i] = -(amplitude/2)+delta*i;
+  }
+}
+
+void generateTriangle(int32_t amplitude, int32_t* buffer, uint16_t length) {
+  // Generate a triangle wave signal with the provided amplitude and store it in
+  // the provided buffer of size length.
+  float delta = float(amplitude)/float(length);
+  for (int i=0; i<length/2; ++i) {
+    buffer[i] = -(amplitude/2)+delta*i;
+  }
+    for (int i=length/2; i<length; ++i) {
+    buffer[i] = (amplitude/2)-delta*(i-length/2);
+  }
+}
+
+void generateSquare(int32_t amplitude, int32_t* buffer, uint16_t length) {
+  // Generate a square wave signal with the provided amplitude and store it in
+  // the provided buffer of size length.
+  for (int i=0; i<length/2; ++i) {
+    buffer[i] = -(amplitude/2);
+  }
+    for (int i=length/2; i<length; ++i) {
+    buffer[i] = (amplitude/2);
+  }
+}
+
+void playWave(int32_t* buffer, uint16_t length, float frequency, float seconds) {
+  // Play back the provided waveform buffer for the specified
+  // amount of seconds.
+  // First calculate how many samples need to play back to run
+  // for the desired amount of seconds.
+  uint32_t iterations = seconds*SAMPLERATE_HZ;
+  // Then calculate the 'speed' at which we move through the wave
+  // buffer based on the frequency of the tone being played.
+  float delta = (frequency*length)/float(SAMPLERATE_HZ);
+  // Now loop through all the samples and play them, calculating the
+  // position within the wave buffer for each moment in time.
+  for (uint32_t i=0; i<iterations; ++i) {
+    uint16_t pos = uint32_t(i*delta) % length;
+    int32_t sample = buffer[pos];
+    // Duplicate the sample so it's sent to both the left and right channel.
+    // It appears the order is right channel, left channel if you want to write
+    // stereo sound.
+    i2s.write(sample, sample);
+  }
+}
+
+void setup() {
+  // Configure serial port.
+  Serial.begin(115200);
+  Serial.println("Zero I2S Audio Tone Generator");
+
+  // Initialize the I2S transmitter.
+  if (!i2s.begin(I2S_32_BIT, SAMPLERATE_HZ)) {
+    Serial.println("Failed to initialize I2S transmitter!");
+    while (1);
+  }
+  i2s.enableTx();
+
+  // Generate waveforms.
+  generateSine(AMPLITUDE, sine, WAV_SIZE);
+  generateSawtooth(AMPLITUDE, sawtooth, WAV_SIZE);
+  generateTriangle(AMPLITUDE, triangle, WAV_SIZE);
+  generateSquare(AMPLITUDE, square, WAV_SIZE);
+}
+
+void loop() {
+  Serial.println("Sine wave");
+  for (int i=0; i<sizeof(scale)/sizeof(float); ++i) {
+    // Play the note for a quarter of a second.
+    playWave(sine, WAV_SIZE, scale[i], 0.25);
+    // Pause for a tenth of a second between notes.
+    delay(100);
+  }
+  Serial.println("Sawtooth wave");
+  for (int i=0; i<sizeof(scale)/sizeof(float); ++i) {
+    // Play the note for a quarter of a second.
+    playWave(sawtooth, WAV_SIZE, scale[i], 0.25);
+    // Pause for a tenth of a second between notes.
+    delay(100);
+  }
+  Serial.println("Triangle wave");
+  for (int i=0; i<sizeof(scale)/sizeof(float); ++i) {
+    // Play the note for a quarter of a second.
+    playWave(triangle, WAV_SIZE, scale[i], 0.25);
+    // Pause for a tenth of a second between notes.
+    delay(100);
+  }
+  Serial.println("Square wave");
+  for (int i=0; i<sizeof(scale)/sizeof(float); ++i) {
+    // Play the note for a quarter of a second.
+    playWave(square, WAV_SIZE, scale[i], 0.25);
+    // Pause for a tenth of a second between notes.
+    delay(100);
+  }
+}