Manipulating PA30 and PA31 pins on Seeeduino XIAO

PA30_PA31_output.ino

void setup() {
  // instead of pinMode(30, OUTPUT);
  (&(PORT->Group[PORTA]))->PINCFG[30].reg = (uint8_t)(PORT_PINCFG_INEN);
  (&(PORT->Group[PORTA]))->PINCFG[31].reg = (uint8_t)(PORT_PINCFG_INEN);
  (&(PORT->Group[PORTA]))->DIRSET.reg = (1 << 30);
  (&(PORT->Group[PORTA]))->DIRSET.reg = (1 << 31);
}

void loop() {
  // instead of digitalWrite(30, HIGH);
  (&(PORT->Group[PORTA]))->OUTSET.reg = (1 << 30);
  (&(PORT->Group[PORTA]))->OUTSET.reg = (1 << 31);
  delay(1000);

  // instead of digitalWrite(30, LOW);
  (&(PORT->Group[PORTA]))->OUTCLR.reg = (1 << 30);
  (&(PORT->Group[PORTA]))->OUTCLR.reg = (1 << 31);
  delay(1000);
}