Pin Change Interrupt on PB3. Am I doing something daft?

Projects Programming
2

I can’t tell you if your register setup is correct. Why don’t you just use the attachedInterrupt() function?

I can tell you that your accessing of ‘val’ in loop() may not be atomic. Try this:

void loop() {
  uint32_t localVal;
  noInterrupts();
  localVal = val;
  interrupts();
  Serial.println(localVal);
}

You might also want a delay in loop() to slow down the print rate.