#include "keypad1.h"

void delay1() {
  unsigned long i;
  for (i = 0; i < 100000; i++);
}



void output(char data)
{
  volatile char *portf_d;
  portf_d=0x31;
  *portf_d=data;
}

char input()
{
  volatile char *portk_d;
  portk_d=0x106;
  char input_d = ~(*portk_d);  // Active-low
  return input_d;
}

char get_Key()
{
  Serial.begin(9600);
  int row,col;
  int coloumn;
  char key_pressed;
  for(row=0;row<4;row++)
  {
    output(~(1<<row));
    delay1();
     coloumn=input();
      if(coloumn!=0x00)
      {
        for(col=0;col<4;col++)
        {
          if(coloumn==(0x01<<col))
          {
            key_pressed=row*4+col+1;
            delay1();
             Serial.println(key_pressed);
            return (key_pressed);
           
          }
        }
      }
    }
  
  return 0;
}


void setup() {
  init_port();
  Serial.begin(9600);
}

char keymap[16] = {
  '1','2','3','A',
  '4','5','6','B',
  '7','8','9','C',
  '*','0','#','D'
};

void loop() {
  char key = get_Key();
  if (key != 0 && key <= 16) {
    Serial.print("Key Pressed: ");
    Serial.println(keymap[key - 1]);  // Adjust for 0-index
  }
}