AMY_BuildYourOwnPartials.ino

#include "AMY-Arduino.h"
AMY amy;

// --- I2S Driver ---
#include <ESP_I2S.h>
I2SClass I2S;

// --- Initialize everything ---
void setup() 
{
  // --- Start up AMY ---
  amy.begin(1, 0, 1, 0);  // Cores==2, Reverb==0, Chorus==1, Echo==0

  // --- Serial stuff (Serial Monitor output and IMDI in) ---  
  Serial.begin(115200);

  // --- Set and start I2S ---
  I2S.setPins(13, 11, 12, -1, -1); // MB 20240807
  I2S.begin(I2S_MODE_STD, AMY_SAMPLE_RATE, I2S_DATA_BIT_WIDTH_16BIT, I2S_SLOT_MODE_STEREO); // I2S.begin(I2S_PHILIPS_MODE, AMY_SAMPLE_RATE, BYTES_PER_SAMPLE8);
}

// --- Main loop function ---
void loop() 
{
  int num_partials = 16;
  float base_freq = 261.63;
  int base_osc = 0;

  struct event e = amy.default_event();
  e.time=0;
  e.osc=base_osc;
  e.wave=PARTIALS;
  sprintf(e.algo_source,"%d",num_partials);
  amy.add_event(e);

  for(int i=1; i< num_partials+1; i++)
  {
    // Set up each partial as the corresponding harmonic of the base_freq, with an amplitude of 1/N, 50ms attack, and a decay of 1 sec / N
    e = amy.default_event();
    e.osc=base_osc+i;
    e.wave=PARTIAL;
    e.freq_coefs[COEF_CONST]=base_freq*i;
    sprintf(e.bp0,"50,%.2f,%d,0,0,0", 1.f/i, 1000/i);
    amy.add_event(e);
  }    
  e = amy.default_event();
  e.time=100;
  e.osc=0;
  e.midi_note=60;
  e.velocity=0.5;
  amy.add_event(e);
  
  e = amy.default_event();
  e.time=200; 
  e.osc=0; 
  e.midi_note=72; 
  e.velocity=1;
  amy.add_event(e);
    
  // --- Render the amy-events from above to audio ---  
  while(true)
  {
    short* samples = amy.render_to_buffer();
    I2S.write((uint8_t*)samples, AMY_BLOCK_SIZE*AMY_NCHANS*BYTES_PER_SAMPLE);
  }
}