#define DISNUM0 0x00
#define DISNUM1 0x01
#define DISNUM2 0x02
#define DISNUM3 0x03
#define DISNUM4 0x04
#define DISNUM5 0x05
#define DISNUM6 0x06
#define DISNUM7 0x07
#define DISNUM8 0x08
#define DISNUM9 0x09
#define DISNUM10 0x0a
#define DISNUM11 0x0b
#define DISNUM12 0x0c
#define DISNUM13 0x0d
#define DISNUM14 0x0e
#define DISNUM15 0x0f


#define DELAY 1000000

volatile char assume_keypad_array[4]= {0x01, 0x02, 0x04,0x08};
volatile char assume_keypad_array_col[8]= {0x01, 0x02,0x00, 0x04,0x00,0x00,0x00,0x08};

void setup() {
    volatile char *dirf, *dirk, *dirl, *dirc;

    dirf = (volatile char *)0x30;  *dirf = 0xFf;  
    dirl = (volatile  char *)0x10a; *dirl = 0xFf;  
    dirk = (volatile char *)0x107; *dirk = 0xF0; 
    dirc = (volatile char *)0x27; *dirc = 0xFf;
   
}


void loop() {
keypad_input();

}

void keypad_input(){
   volatile unsigned char *outf, *ink, *outl,*outc;
ink = (volatile unsigned char *)0x106;
outf = (volatile unsigned char *)0x31;
outc= (volatile unsigned char *)0x28;
 while (1) {
    for (volatile long i = 0; i < 4; i++) { // red - row, green - column
    *outf = 1 << i;
    // volatile int x =*outf;
    volatile int  y = *ink;
    if(y!=0){
      // *outc  = keypad_array[i][y-1];
      *outc  = assume_keypad_array[i];
      // *outc = assume_keypad_array_col[y-1];
      // delay();
      // *outl = 0x00;
            }
            
        }
    }
}