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){
        return (~(0x80) & data);
    } else {
        int ones = 0;
        int parity = 0;
        for (int i = 0; i < 7; i++){
            ones += ((data >> i) & 1);
        }
        if (!ctrl->parity_type){
            parity = ones % 2;
        } else {
            parity = 1 - (ones % 2);
        }
        return data|(parity << 7);
    }
}

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