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) {
    int tempData = data;

    if(!ctrl->parity_enable){ // Parity is disabled
        tempData &= ~(1 << 7);
    }

    else{   // Parity is enabled
        int count = 0;
        while(data){
            data = data & (data-1);
            count++;
        }
        
        if(!ctrl->parity_type){  // Odd parity
            if((count % 2) == 0){
                tempData &= ~(1 << 7);
            }
            else{
                tempData |= (1 << 7);
            }
        }

        else{   // Even parity
            if((count % 2) == 0){
                tempData |= (1 << 7);
            }
            else{
                tempData &= ~(1 << 7);
            }
        }

    }
    return tempData;
}

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