Interrupt - FALLING verhält sich wie CHANGE?!

International Deutsch
10

CHANGE und FALLING funktionieren genau wie erwartet und dokumentiert (auf einem Mega),
also Interrupt - FALLING verhält sich wie CHANGE:

const byte pinD2 = 2;
const byte pinD3 = 3;

uint16_t toggle2;
uint16_t toggle3;

volatile uint16_t countISR2;
volatile uint16_t countISR3;

void isr2() {
  countISR2++;
}
void isr3() {
  countISR3++;
}
void setup() {
  Serial.begin(250000);
  pinMode(pinD2, OUTPUT);
  pinMode(pinD3, OUTPUT);
  attachInterrupt(digitalPinToInterrupt(pinD2), isr2, FALLING);
  attachInterrupt(digitalPinToInterrupt(pinD3), isr3, CHANGE);
}

void loop() {
  static uint32_t lastSecond;
  static uint32_t lastToggle2;
  static uint32_t lastToggle3;
  uint32_t topLoop = millis();
  if (topLoop - lastSecond >= 1000) {
    lastSecond = topLoop;
    noInterrupts();
    uint32_t copy2 = countISR2;
    uint32_t copy3 = countISR3;
    countISR2 = 0;
    countISR3 = 0;
    interrupts();
    Serial.print(F("D2: toggled "));
    Serial.print(toggle2);
    Serial.print(F(" counted "));
    Serial.print(copy2);
    Serial.print(F(", D3: toggled "));
    Serial.print(toggle3);
    Serial.print(F(" counted "));
    Serial.println(copy3);
    toggle2 = 0;
    toggle3 = 0;
  }
  if (topLoop - lastToggle2 >= 7) {
    toggle2++;
    digitalWrite(pinD2, !digitalRead(pinD2));
    lastToggle2 += 7;
  }
  if (topLoop - lastToggle3 >= 5) {
    toggle3++;
    digitalWrite(pinD3, !digitalRead(pinD3));
    lastToggle3 += 5;
  }
}

D2: toggled 142 counted 71, D3: toggled 199 counted 199
D2: toggled 143 counted 71, D3: toggled 200 counted 200
D2: toggled 143 counted 72, D3: toggled 200 counted 200
D2: toggled 143 counted 71, D3: toggled 200 counted 200
D2: toggled 143 counted 72, D3: toggled 200 counted 200
D2: toggled 143 counted 71, D3: toggled 200 counted 200
D2: toggled 142 counted 71, D3: toggled 200 counted 200
D2: toggled 143 counted 72, D3: toggled 200 counted 200
D2: toggled 143 counted 71, D3: toggled 200 counted 200
D2: toggled 143 counted 72, D3: toggled 200 counted 200
D2: toggled 143 counted 71, D3: toggled 200 counted 200
D2: toggled 143 counted 72, D3: toggled 200 counted 200
D2: toggled 143 counted 71, D3: toggled 200 counted 200