Cosmic Pi 1MSPS readout test

int x;  // read value
int adcloopctr;
unsigned long values[100];
const int eventtrigger = 49;
boolean eventhappened = false; 
int sampledepth = 10;
int printctr = 0;
int readoutctr;

void setup()
{
//  analogReference(INTERNAL);
  pinMode(eventtrigger, INPUT);
attachInterrupt(eventtrigger, monkey, FALLING);
  Serial.begin(115200);                           // initialize the serial port:
  REG_ADC_MR = 0x10380180;                       // change from 10380200 to 10380180, 1 is the PREESCALER and 8 means FREERUN
  ADC -> ADC_CHER = 0x80; // enable ADC on pin A0
eventhappened = false;
adcloopctr=0;
Serial.println("Alive");
}

void loop() {

  //unsigned long t = micros();                    // init time an elapsed time, in micro seconds
  
  //for(i = 0; i < 1000; i++) {
    
    // instrucction to measure
    while((ADC->ADC_ISR & 0x80)==0);             // wait for conversion
    values[adcloopctr] = ADC->ADC_CDR[7];                         // read value A0
    

  
  
if (eventhappened){
    //Serial.println("Event");
    //for (int printctr = adcloopctr+1; printctr+1 < sampledepth+adcloopctr; printctr++) {
    //Serial.print(printctr);
    //Serial.print(", ");
    //if (printctr > sampledepth){
    //Serial.println(values[(printctr)]);
    //Serial.println(values[(printctr)]);
    //}
    //printctr = ++printctr % sampledepth;
readoutctr=10;
    for (int firsthalf=adcloopctr+1; firsthalf<sampledepth; firsthalf++)
    {
      Serial.print(readoutctr);
      Serial.print(", ");
      Serial.println(values[firsthalf]);
      readoutctr--;
    }
    for (int secondhalf=0; secondhalf<adcloopctr+1; secondhalf++)
    {
      Serial.print(readoutctr);
      Serial.print(", ");
      Serial.println(values[secondhalf]);
      readoutctr--;
    }
    
    eventhappened = false;
    //delay(200);
  }
adcloopctr++;
  if (adcloopctr==sampledepth) {
adcloopctr=0;
}

 
}

void monkey()
{
  //Serial.println("trigger");
eventhappened = true;
}