/*
  Demo of simple toggle on/off button code
  Button toggles two seperate groups of leds
  Uses button state 'status' to determine last state of button press
  Button connected to PB0
  LEDs connected to PB1..PB4
  Sketch size: 1444 bytes. Same sketch using Arduino framework: 3274 bytes
  Remove Serial.begin and Serial.println and size is 318 bytes

  1/12/24 CM: Added debounce code, need to work on this.
*/

#include <avr/io.h>
#include <util/delay.h>
#include <TinyDebug.h>

#define BUTTON PB0

// Function to print value as 8 bit binary number
int binaryNumber[8]; // Empty array to store 8-bit (0 - 255) binary number
void Eight_Bit_Binary_Array(int num);

int main(void) {
  Debug.begin();
  uint8_t buttonStatus = 0; // button state
  uint8_t buttonRead;
  uint8_t oldButtonRead = 0;
  const uint8_t debounceTime = 10;  // milliseconds

  DDRB = 0xff; // set all of DDRB as output, 11111111
  DDRB &= ~(1 << BUTTON); // set PB0 -> BUTTON as input 11111110
  PORTB = 0x00; // set all of PORTB low, 00000000
  PORTB |= (1 << BUTTON); // initialize pullup resistor on PB0 -> BUTTON, 00000001
  //BUTTON_PORT = 0x01; // same result as above

  while (1) {
    // Push button 1
    buttonRead = digitalRead(PB0); // reads 1 with pull-up
    //Debug.print("buttonRead: "); Debug.println(buttonRead);

    // Button debounce
    if (buttonRead != oldButtonRead) {
      oldButtonRead = buttonRead;
      _delay_ms(debounceTime);


    // PINB contains input state of all B pins. So PINB is 00000001 as PB0 was set with a pullup resistor.
    // (1 << PB0) is 00000001, 
    if ((PINB & (1 << PB0)) == 1) {  // using AND, 00000001 AND 00000001 = 1, so this is true and runs code
      Debug.print("buttonStatus1 = "); Debug.println(buttonStatus);
      Debug.print(F("PINB pullup button")); Eight_Bit_Binary_Array(PINB);
      if (buttonStatus == 0) {
        Debug.print("buttonStatus2 = "); Debug.println(buttonStatus);
        PORTB = 0b00000110; // so this is the beginning state before a button push
        buttonStatus = 1; // update the state
        Debug.print("buttonStatus3 = "); Debug.println(buttonStatus);
      }
    }
    else { // button is not pressed now
      PORTB = 0b00011000; // when button is pushed PINB will be 00000000 AND 00000001 will result in 0
      buttonStatus = 0; // update the state
      Debug.print("buttonStatus4 = "); Debug.println(buttonStatus);
    }


  _delay_ms(100);
  Debug.print("buttonStatus5 = "); Debug.println(buttonStatus);
  Debug.print("PINB = "); Eight_Bit_Binary_Array(PINB);
  
    }
    }

  return 0;
}

void Eight_Bit_Binary_Array(int num) {
  // Convert decimal to binary and store the bits in an array
  for (int i = 7; i >= 0; i--) {
    binaryNumber[i] = num & 1; // Extract the least significant bit
    num >>= 1; // Right-shift the decimal number to get the next bit
  }
  Debug.print(" = ");
  for (int i = 0; i < 8; i++) {
    Debug.print(binaryNumber[i]); // Print the binary number only of the array
  }
  Debug.print("\n");
}