click counter to light up LEDs using C code

Question

I'm designing a click counter for a microcontroller and I'm using C for developing the code.

What happens here is when I click first button it will count the number of button presses. Then I have to press the second button to display the count in binary lighting up the LEDs. For example, if I press first button 10 times, it will light up second LED and fourth LED.

Since there are 8 LEDs I'm using 2 different ports.( 6 bits from PORTB and 2 bits from PORTD). For that I have developed a code using if/else.But I want to implement this operation without multiple if/else operations because this method doesn't seem like much efficient.

while(PIND & 0b00100000){                   //while PD5 switch is not pressed
        if(clickCount>=128){                //if click count>=128
            PORTB = PORTB | 0b00100000;     //set PB5 HIGH
            clickCount-=128;                //deduct 128 from clickCount
        }else if(clickCount>=64){
            PORTB = PORTB | 0b00010000;
            clickCount-=64;
        }else if(clickCount>=32){
            PORTB = PORTB | 0b00001000;
            clickCount-=32;
        }else if(clickCount>=16){
            PORTB = PORTB | 0b00000100;
            clickCount-=16;
        }else if(clickCount>=8){
            PORTB = PORTB | 0b00000010;
            clickCount-=8;
        }else if(clickCount>=4){
            PORTB = PORTB | 0b00000001;
            clickCount-=4;
        }else if(clickCount>=2){
            PORTD = PORTD | 0b10000000;
            clickCount-=2;
        }else if(clickCount==1){
            PORTD = PORTD | 0b01000000;
            clickCount = 0;
        }           
    }

And I want to make this code in less number of bytes. So is there any way to develop this code segment using a for loop or any other method?

Answer 1

I don't know if this reduces the binary size, and not tested. You can still do something like this:

 unsigned char mask[] = {
     0b01000000, 0b10000000, 0b00000001, 0b00000010,
     0b00000100, 0b00001000, 0b00010000, 0b00100000};
 while(PIND & 0b00100000) {
     for (int i = 7, v = 128; i > -1; --i, v /= 2) {
         if (clickCount >= v && clickCount > 0) {
             if (clickCount >= 4) {
               PORTB = PORTB | mask[i];
             } else {
               PORTD = PORTD | mask[i];
             }
             clickCount -= v;
             break;
         }
     }
 }

Or you can use a single loop:

int v = 128, i = 7;
while (v > 0 && (PIND & 0b00100000)) {
    if (clickCount >= v) {
         if (clickCount >= 4) {
           PORTB = PORTB | mask[i];
         } else {
           PORTD = PORTD | mask[i];
         }
        clickCount -= v;
    } else {
        --i;
        v /= 2;
    }
}

Answer 2

This could be done by just assigning values to PORTB and PORTD seperately since you have the number of clicks stored in a variable-clickCounter.

PORTB = PORTB | (clickCount & 0b00111111);
PORTD = PORTD | (clickCount & 0b11000000);