/* Defines  ----------------------------------------------------------*/
#define SENSOR_SAMPLES    1024 //buffer size
#define AXIS              1    //microphone is 1 axis
#define DOWNSAMPLE        32   //microphone as a very high data rate, we downsample it


/* Prototypes ----------------------------------------------------------*/
void get_microphone_data(); //function to collect buffer of sound

/* Global variables ----------------------------------------------------------*/
static uint16_t neai_ptr = 0; //pointers to fill for sound buffer
static float neai_buffer[SENSOR_SAMPLES * AXIS] = {0.0}; //souhnd buffer
int const AMP_PIN = A0;       // Preamp output pin connected to A0

/* Setup function ----------------------------------------------------------*/
void setup() {
  Serial.begin(115200);
  delay(10);
}

/* Infinite loop ----------------------------------------------------------*/
void loop() {
  if (analogRead(A0)> 400){
    get_microphone_data();
  }

}


/* Functions declaration ----------------------------------------------------------*/
void get_microphone_data()
{
  static uint16_t temp = 0; //stock values
  int sub = 0; //increment to downsample
  //while the buffer is not full
  while (neai_ptr < SENSOR_SAMPLES) {
    //we only get a value every DOWNSAMPLE (32 in this case)
    if (sub > DOWNSAMPLE) {
      /* Fill neai buffer with new accel data */
      neai_buffer[neai_ptr] = analogRead(AMP_PIN);
      /* Increment neai pointer */
      neai_ptr++;
      sub = 0; //reset increment
    }
    else {
      //we read the sample even if we don't use it
      //else it is instantaneous and we don't downsample
      temp = analogRead(AMP_PIN);
    }
    sub ++;
  }
  //print the buffer values to send them via serial
  for (uint16_t i = 0; i < SENSOR_SAMPLES; i++) {
    Serial.print(neai_buffer[i]);
    Serial.print(" ");
  }
  Serial.print("\n");
  neai_ptr = 0; //reset the beginning position
}