Construct UART Data Frame with Parity Bit

Code

#include <stdio.h>
#include <stdint.h>

typedef struct {
    uint8_t parity_enable : 1;
    uint8_t parity_type   : 1;
    uint8_t reserved      : 6;
} UART_Control;

uint8_t countSetBits (uint8_t n){
    uint8_t count = 0;
    while(n){
        n &= n-1;
        count++;
    }
    return count;
}

uint8_t create_uart_frame(uint8_t data, UART_Control *ctrl) {
    // Your logic here
    if(ctrl->parity_enable == 0){
        return data & 0x3F;
    }
    else{
        if(ctrl->parity_type == 1){
           if(countSetBits(data) % 2 == 0){
            return data + 0x80;
           }
           else{
            return data & 0x7F;
           } 
        }
        else{
            if(countSetBits(data) % 2 == 0){
                
                return data & 0x7F;
            }
            else{
                return data + 0x80;
            }
        }
    }
    return 0;
}

int main() {
    uint8_t data;
    scanf("%hhu", &data);  // 7-bit input

    uint8_t parity_enable, parity_type;
    scanf("%hhu %hhu", &parity_enable, &parity_type);

    UART_Control ctrl;
    ctrl.parity_enable = parity_enable;
    ctrl.parity_type = parity_type;

    uint8_t frame = create_uart_frame(data, &ctrl);
    printf("frame = 0x%02X", frame);

    return 0;
}

Solving Approach