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 count_ones (uint8_t data){

    uint8_t count;
    for(int i =0; i < 7; i++){
        if (data & (1<<i)){

            count++;
        }
    }
    return count;
}
uint8_t create_uart_frame(uint8_t data, UART_Control *ctrl) {

    data = (data & 0x7F);
    if (ctrl->parity_enable == 0){

        return data;
    }

    uint8_t ones = count_ones(data);
    uint8_t parity_bit;

    if (ctrl->parity_type == 0){
        if (ones % 2 == 0){

        parity_bit = 0;
    }else{

        parity_bit = 1;
    }
    }
    else{
        if (ones % 2 == 0){

        parity_bit = 1;
    }else{

        parity_bit = 0;
    }

    }

    return ((parity_bit << 7)| 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