Help me please to convert this Sudoku code into Assembly

byte readKey(){

byte ch;

do

{

PORTA = 0x0F; //set all output pins PA7-PA4 to 0

while(PORTA == 0x0F) // Checking for the leading edge //bits PA3-PA0 are 1 until a key is pressed)

{

code = PORTA; // get the keycode from the user

delayms(10); //Delay for the debounce of button

}

}while(code != PORTA); //start again when PORTA changes

code = readKeyCode(); //call readKeyCode to get keycode

PORTA = 0x0F; // set pins PA7-PA4 to 0

while(PORTA != 0x0F) // wait for trailing edge

{

delayms(10); //delay for the debounce of the key

}

ch = translate(code);//call translate to get ASCII code

return(ch);

}