Two characters(char) from serial monitor in the one field of the matrix-Problem!

hi! can please me code(sample of code)?

i wrote program reads character serial monitor , converts byte (matrix) .
wonder how write 2 characters serial monitor in 1 field of matrix?
this first program arduinom!




this code:

code: [select]

byte sectorkeya[16][16];
byte var[16][16]={
  {
    0xff, 0xff, 0xff, 0xff, 0xff, 0xff  }
  ,
  {
    0xff, 0xff, 0xff, 0xff, 0xff, 0xff  }
  ,/// / ko ga poskusite znova, ga spremenite v vašo novo geslo
  {
    0xff, 0xff, 0xff, 0xff, 0xff, 0xff  }
  ,
  {
    0xff, 0xff, 0xff, 0xff, 0xff, 0xff  }
  ,
};
void setup()
{
serial.begin (9600);
}

void loop()
{
  while (serial.available()<24 );
    {
    }
        int x;
        ( x=0; x < 6; x++){
          int y;
          (y=0; y < 4; y++){
          var[y][x] = serial.read();
          {
          }
                              if (var[y][x] >= 0x30 && var[y][x] <= 0x39)  // char dec 0 9
                                { var[y][x]= var[y][x] - 0x30 ;
                                }
                                if (var[y][x] >= 0x61 && var[y][x] <= 0x66) // char dec "a" "f"
                                  {
                                    var[y][x]= var[y][x] - 0x61 +10;
                                  }
                                  if (var[y][x] >= 0x41 && var[y][x] <= 0x46)// char dec "a" "f"
                                     {
                                       var[y][x]= var[y][x] - 0x41 +10;
                                     }
                                       serial.print(var[y][x],hex);
                            }
                            }
  serial.flush();
}

current printout;

i want printout;


can write in 4th row,  sectorkey [3] [0-5] , in 1,2 , 3 row remain values in in picture 2??
i'm sorry eng!

any appreciated. thanks.

read 1 character. convert ascii binary. store in variable. shift contents of variable left 8. read second character. convert binary , add variable:

code: [select]

char h = 'f';
char l = 'f';

int r = hexasciitobinary(h);
r <<= 8;
r+= hexasciitobinary(l);

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