Digital Electronics Lab 11

Below is my code in part_1_button:

#include "Button.h"

Button buttonOne(33, 1);
Button buttonTwo(34, 3);
Button buttonThree(35, 5);
Button buttonFour(36, 6);

void setup() {
  Serial.begin(9600);
  buttonOne.pressHandler(onPress);
  buttonOne.releaseHandler(onRelease);
  buttonTwo.pressHandler(onPress);
  buttonTwo.releaseHandler(onRelease);
  buttonThree.pressHandler(onPress);
  buttonThree.releaseHandler(onRelease);
  buttonFour.pressHandler(onPress);
  buttonFour.releaseHandler(onRelease);
}

void loop() {
  buttonOne.process();
  buttonTwo.process();
  buttonThree.process();
  buttonFour.process();
}

void onPress(int buttonNumber) {
  Serial.print(buttonNumber);
  Serial.println(" pressed");
}

void onRelease(int buttonNumber) {
  Serial.print(buttonNumber);
  Serial.println(" released");

}

Below is my code in Button.cpp

#include "Arduino.h"
#include "Button.h"

Button::Button(int _buttonPin, int _buttonNum)
{
  buttonPin = _buttonPin;
  buttonNum = _buttonNum;
  buttonState = 0;
  lastButtonState = 0;

  pinMode(buttonPin, INPUT);
}

void Button::process()
{
  lastButtonState = buttonState;
  buttonState = digitalRead(buttonPin);

  if (lastButtonState == LOW && buttonState == HIGH) {
    pressCallback(buttonNum);
    usbMIDI.sendNoteOn(59 + buttonNum, 127, 1);
    delay(5);
  }
  if (lastButtonState == HIGH && buttonState == LOW) {
    releaseCallback(buttonNum);
    usbMIDI.sendNoteOff(59 + buttonNum, 0, 1);
    delay(5);
  }
}

void Button::pressHandler(void (*f)(int))    //button down
{
  pressCallback = *f;
}

void Button::releaseHandler(void (*f)(int))  //button release
{
  releaseCallback = *f;
}

Below is my code in Button.h

#ifndef Buttons_h
#define Buttons_h

#include "Arduino.h"

class Button
{
  public:
    Button(int _buttonPin, int _buttonNum);
    
    void process();
    void pressHandler(void (*f)(int));
    void releaseHandler(void (*f)(int));
    void (*pressCallback)(int);
    void (*releaseCallback)(int);

  private:
    int buttonPin;
    int buttonNum;
    bool buttonState;
    bool lastButtonState;
};

#endif

The variables pressCallBack and releaseCallBack are functioning as a variable while being a function. In the code in Button.cpp the pressCallBack and releaseCallBack is being used as a function in the “Button :: process()” section of the code. Then in the bottom section it is used is a variable which is used in both codes in Button.h and part_1_button.