/*
  High Speed Toggle Test
 */

#define BLINK_LED 25
#define TEST_LED 3
#define TEST_NR 3

void setup() {
  pinMode(BLINK_LED, OUTPUT);
  pinMode(TEST_LED, OUTPUT);

  for (int i=0; i<3; i++) {
    digitalWrite(BLINK_LED, HIGH);   // turn the LED on (HIGH is the voltage level)
    delay(100);              
    digitalWrite(BLINK_LED, LOW);    // turn the LED off by making the voltage LOW
    delay(100);              
  }
}

void loop() {
  uint32_t mask = 1L<<TEST_LED;
  
  while(1) {
#if TEST_NR == 1
    // toggle test, digitalWrite()
    digitalWrite(TEST_LED, HIGH);
    digitalWrite(TEST_LED, LOW);
#endif

#if TEST_NR == 2
  // toggle test, direct register access, set/clear
    sio_hw->gpio_set = mask;
    sio_hw->gpio_clr = mask;
#endif

#if TEST_NR == 3
  // toggle test, direct register access, XOR (toggle)
    sio_hw->gpio_togl = mask;
#endif    
  }
}