Sine wave output on Seeeduino XIAO

sine_wave.ino

#define MAX_VALUE ((1 << 10) - 1)
#define SIN_MAX (MAX_VALUE / 2.0)

void setup() {
  DAC->CTRLA.bit.ENABLE = 0x01;
  syncDAC();
}

double i = 0.0;

void loop() {
  for (uint16_t k = 0; k < 1024 * 4; k++) {
    DAC->DATA.reg = (uint32_t)(SIN_MAX * sin(i) + SIN_MAX);
    i += 0.0005;
  }
}

void syncDAC() {
  while (DAC->STATUS.bit.SYNCBUSY == 1) ;
}