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_data_ones(uint8_t d)
{
    uint8_t count = 0;
    do{
        if(d &1)
        {
            count++;
        }
        d>>=1;
    }while(d);
    return count;
}
uint8_t create_uart_frame(uint8_t data, UART_Control *ctrl) {
    if(ctrl->parity_enable)
    {
        int count1s = count_data_ones(data);
        if(count1s %2)
        {//odd nb 
            if(ctrl->parity_type == 0)
            //with even parity
                data|=(1<<7);
        }
        else
        {
            //even nn
            if(ctrl->parity_type == 1)
            //with odd parity
                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