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 = data & ~(1 << 7);
        return data;
    }
    else{
        uint8_t temp = data;
        int count = 0;
        while(temp != 0){
            uint8_t n = temp & 1;
            if(n == 1){
                count++;
            }
            temp = temp >> 1;
        }

        if(ctrl -> parity_type == 0){
            if(count % 2 == 0){
                data = data & ~(1 << 7);
            }
            else{
                data = data | (1 << 7);
            }
        }
        else{
            if(count % 2 == 0){
                data = data | (1 << 7);
            }
            else{
                data = data & ~(1 << 7);
            }
        }
    
        return data;
    }
}
 

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