Having trouble using Xiao's DAC

Products & Technology XIAO
2

The following code works.

#include <Arduino.h>

void setup() {
  SerialUSB.begin(9600);
  while(!SerialUSB);

  pinMode(A1, INPUT);
//  pinMode(A0, OUTPUT);            // DAC port is not specified as OUTPUT
  analogReadResolution(10);
  analogWriteResolution(10);

  while(1){
//    analogWrite(A0, pow((double) 2, 32) - 1);
    analogWrite(A0, 1023);           // max 1023
    delay(1000);
    float y = analogRead(A1) * 3.3 / 1023L;
    SerialUSB.print("DAC Output Voltage: ");
    SerialUSB.println(y);
    delay(1000);
  }
}

void loop() {
}
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