I am working on a code including interrupts. They, however, refuse to work, even in this simple code that could be the most basic example of interrupts.

In this simplified extract I have a momentary push button attached to an Ardunio Pro Mini's PIN 2, whith the other side grounded. I have this code uploaded:

#include <Encoder.h>   // is this libary the cause??...

#define PIN_1 4
#define PIN_2 3 //interrupt pin    //using these for a rotary encoder, not in this extract
#define PIN_B 2 //interrupt pin    // the rotary encoder also works as a push-button


void setup() {
  pinMode(PIN_B, INPUT_PULLUP);
  Serial.begin(9600);
  attachInterrupt(PIN_B, ButtonPressISR, FALLING);
  attachInterrupt(PIN_B, ButtonReleaseISR, RISING);
}

void loop() {
  Serial.println("Don't interrupt me");
  delay(10);
}

void ButtonPressISR() {
  Serial.println("Yay, I'm pressed!");
  delay(1000);
}

void ButtonReleaseISR() {
  Serial.println("Yay, I'm released!");
  delay(1000);
}

One would expect that without action, the Ardunio floods the serial console with "Don't interrupt me". And that's correct.

When I press the button, however, nothing on Earth happens, neither of the interrupt service routines starts. No matter how hard I try, "Yay, I'm pressed" and "Yay, I'm released" never appears on the console output, and the 1s delay never happens.

The circuit, shown below, is tested with a multimeter, and is error-free. Pin 2 does getting pulled down, and back, upon button press/release.

^{simulate this circuit – Schematic created using CircuitLab}