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 create_uart_frame(uint8_t data, UART_Control *ctrl) {
    if (ctrl->parity_enable == 0) {
    
        data &= ~(1 << 7);
    } else {
    
        uint8_t temp = data ; 
        int bit_count = 0;
        while (temp) {
            bit_count += temp & 1;
            temp >>= 1;
        }

        int parity = bit_count % 2;

        if (ctrl->parity_type == 0) {
            
            if (parity == 0) {
               data &= ~(1 << 7);
             
            } else {
                data |= (1 << 7);
            }
        } else {
          
            if (parity == 0) {
                data |= (1 << 7);
            } else {
                data &= ~(1 << 7);
            }
        }
    }
    return data;
}

int main() {
    uint8_t data;
    scanf("%hhu", &data);  

    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