PIU code debouncing

/*
   This code contains the follow functions:
   - void setup(): Sets pins 4, 5, 6, 7 to input with pull-up resistors enabled and begins Keyboard functionality
   - void loop(): Main loop - reads pin voltages and sends out corresponding keystrokes via USB
*/

/*
   Pinout:
   - "HIGH" voltage button contacts - pins 4, 5, 6, 7, 8
   - "GND" voltage button contacts - GND pin
*/

/*
   August 17, 2018
   This is an example of one way to de-bounce buttons in code.
   This sketch doesn't really do anything, it only shows how to de-bounce buttons in code.
*/

#include <Keyboard.h>

int upleftStatus = 1;
int upleftStatusPrev = 1;
int downleftStatus = 1;
int downleftStatusPrev = 1;
int centerStatus = 1;
int centerStatusPrev = 1;
int uprightStatus = 1;
int uprightStatusPrev = 1;
int downrightStatus = 1;
int downrightStatusPrev = 1;

int buttonPin4 = 4; // These are defining the pins for the button connections.
int buttonPin5 = 5;
int buttonPin6 = 6;
int buttonPin7 = 7;
int buttonPin8 = 8;


// All five buttons share the variables below.
bool buttonPressed = false; // This is the flag variable that must be false for button input to be accepted.
// When a button is pushed, the above value is set to [true] and a start time [ millis() ] is saved in button_press_start_time.
unsigned long button_press_start_time = 0; // This stores the system time that the button was pushed.
unsigned long button_press_current_time = 0; // This stores the current time, to compare to the value above.

int button_debounce_time = 60; // This is the length of time (in milliseconds) to de-bounce the button inputs.

// @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
// Function prototypes:
// These aren't really needed in this instance (with a one-file sketch in the Arduino IDE) but some compilers do require them.
void buttonPressDelay();
void doButton4stuff();
void doButton5stuff();
void doButton6stuff();
void doButton7stuff();
void doButton8stuff();

// @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@

void setup() {
  // All that is done here is setting the input pin states.
  pinMode(buttonPin4, INPUT_PULLUP);
  pinMode(buttonPin5, INPUT_PULLUP);
  pinMode(buttonPin6, INPUT_PULLUP);
  pinMode(buttonPin7, INPUT_PULLUP);
  pinMode(buttonPin8, INPUT_PULLUP);
  Keyboard.begin();
}

// @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@

void loop() { // begin of main sketch loop

  /*
     Whatever other code you want can go here, outside of the button-handling code.
  */

  upleftStatus = digitalRead(4);
  downleftStatus = digitalRead(5);
  centerStatus = digitalRead(6);
  uprightStatus = digitalRead(7);
  downrightStatus = digitalRead(8);

  //UPLEFT ARROW PRESSED
if (upleftStatus != upleftStatusPrev && upleftStatus == LOW)
{
  Keyboard.press('r');
  upleftStatusPrev = upleftStatus;
}
//UPLEFT ARROW RELEASED
if (upleftStatus != upleftStatusPrev && upleftStatus == HIGH)
{
  Keyboard.release('r');
  upleftStatusPrev = upleftStatus;
}

//DOWNLEFT ARROW PRESSED
if (downleftStatus != downleftStatusPrev && downleftStatus == LOW)
{
  Keyboard.press('v');
  downleftStatusPrev = downleftStatus;
}
//DOWNLEFT ARROW RELEASED
if (downleftStatus != downleftStatusPrev && downleftStatus == HIGH)
{
  Keyboard.release('v');
  downleftStatusPrev = downleftStatus;
}

//CENTER ARROW PRESSED
if (centerStatus != centerStatusPrev && centerStatus == LOW)
{
  Keyboard.press('g');
  centerStatusPrev = centerStatus;
}
//CENTER ARROW RELEASED
if (centerStatus != centerStatusPrev && centerStatus == HIGH)
{
  Keyboard.release('g');
  centerStatusPrev = centerStatus;
}

//UPRIGHT ARROW PRESSED
if (uprightStatus != uprightStatusPrev && uprightStatus == LOW)
{
  Keyboard.press('y');
  uprightStatusPrev = uprightStatus;
}
//UPRIGHT ARROW RELEASED
if (uprightStatus != uprightStatusPrev && uprightStatus == HIGH)
{
  Keyboard.release('y');
  uprightStatusPrev = uprightStatus;
}

//DOWNRIGHT ARROW PRESSED
if (downrightStatus != downrightStatusPrev && downrightStatus == LOW)
{
  Keyboard.press('n');
  downrightStatusPrev = downrightStatus;
}
//DOWNRIGHT ARROW RELEASED
if (downrightStatus != downrightStatusPrev && downrightStatus == HIGH)
{
  Keyboard.release('n');
  downrightStatusPrev = downrightStatus;
}

  if (buttonPressed == false) {
    // The 'if' conditional statement above only allows checking for button presses if the boolean indicator is set to [false].
    // The boolean indicator will only be false if there have been no button presses since the button_delay_time has elapsed from the previous button press.

    // Below is reading the #4 button pin.
    // Since the pins were set to input_pullup, these should be checked for the low state.
    if (digitalRead(buttonPin4) == LOW) {
      buttonPressDelay(); // The buttonPressDelay() function disables further button input, so that is called first.
      doButton4stuff(); // Whatever this button press does, is in this function.
    }

    // Below is reading the #5 button pin.
    if (digitalRead(buttonPin5) == LOW) {
      buttonPressDelay(); // The buttonPressDelay() function disables further button input, so that is called first.
      doButton5stuff(); // Whatever this button press does, is in this function.
    }

    // Below is reading the #6 button pin.
    if (digitalRead(buttonPin6) == LOW) {
      buttonPressDelay(); // The buttonPressDelay() function disables further button input, so that is called first.
      doButton6stuff(); // Whatever this button press does, is in this function.
    }

    // Below is reading the #7 button pin.
    if (digitalRead(buttonPin7) == LOW) {
      buttonPressDelay(); // The buttonPressDelay() function disables further button input, so that is called first.
      doButton7stuff(); // Whatever this button press does, is in this function.
    }

    // Below is reading the #8 button pin.
    if (digitalRead(buttonPin8) == LOW) {
      buttonPressDelay(); // The buttonPressDelay() function disables further button input, so that is called first.
      doButton8stuff(); // Whatever this button press does, is in this function.
    }


  } // end of ---> if (buttonPressed == false)
  else { // ---> if (buttonPressed == true)
    // The code below re-sets the buttonPressed variable to false, but only after the amount of milliseconds in {button_delay_time} have passed.
    // Other parts of the sketch can run during this wait time, but no more button inputs will be accepted until this time period expires.
    button_press_current_time = millis();
    if (button_press_current_time >= button_press_start_time) {
      if (button_press_current_time >= (button_press_start_time + button_debounce_time)) {
        buttonPressed = false;
      }
    }
    else { // if (button_press_current_time < button_press_start_time)
      // This test checks for the condition that happens when the system timer has rolled over.
      button_press_start_time = millis();
    }
  }

  /*
     Whatever other code you want can go here, outside of the button-handling code.
  */

} // This is the end of the main sketch loop.

// @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@

// The function below is what gets called whenever any button is pushed. The delay time is the same for all buttons.
void buttonPressDelay() {
  button_press_start_time = millis();
  buttonPressed = true;
}

// @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@

void doButton4stuff() {
  //UPLEFT ARROW PRESSED
if (upleftStatus != upleftStatusPrev && upleftStatus == LOW)
{
  Keyboard.press('r');
  upleftStatusPrev = upleftStatus;
}
//UPLEFT ARROW RELEASED
if (upleftStatus != upleftStatusPrev && upleftStatus == HIGH)
{
  Keyboard.release('r');
  upleftStatusPrev = upleftStatus;
}// Whatever button 4 should do, goes in here
}

// @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@

void doButton5stuff() {

  //DOWNLEFT ARROW PRESSED
if (downleftStatus != downleftStatusPrev && downleftStatus == LOW)
{
  Keyboard.press('v');
  downleftStatusPrev = downleftStatus;
}
//DOWNLEFT ARROW RELEASED
if (downleftStatus != downleftStatusPrev && downleftStatus == HIGH)
{
  Keyboard.release('v');
  downleftStatusPrev = downleftStatus;
}

  // Whatever button 5 should do, goes in here
}

// @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@

void doButton6stuff() {

  //CENTER ARROW PRESSED
if (centerStatus != centerStatusPrev && centerStatus == LOW)
{
  Keyboard.press('g');
  centerStatusPrev = centerStatus;
}
//CENTER ARROW RELEASED
if (centerStatus != centerStatusPrev && centerStatus == HIGH)
{
  Keyboard.release('g');
  centerStatusPrev = centerStatus;
}
  // Whatever button 6 should do, goes in here
}

//@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@

void doButton7stuff() {

  //UPRIGHT ARROW PRESSED
if (uprightStatus != uprightStatusPrev && uprightStatus == LOW)
{
  Keyboard.press('y');
  uprightStatusPrev = uprightStatus;
}
//UPRIGHT ARROW RELEASED
if (uprightStatus != uprightStatusPrev && uprightStatus == HIGH)
{
  Keyboard.release('y');
  uprightStatusPrev = uprightStatus;
}
  // Whatever button 7 should do, goes in here
}

// @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@

void doButton8stuff() {

//DOWNRIGHT ARROW PRESSED
if (downrightStatus != downrightStatusPrev && downrightStatus == LOW)
{
  Keyboard.press('n');
  downrightStatusPrev = downrightStatus;
}
//DOWNRIGHT ARROW RELEASED
if (downrightStatus != downrightStatusPrev && downrightStatus == HIGH)
{
  Keyboard.release('n');
  downrightStatusPrev = downrightStatus;
}
  // Whatever button 8 should do, goes in here
}

// ~~~~~~~~ the end ~~~~~~~~~~