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 = 0;
    while (data) {
        count += (data & 1);
        data >>= 1;
    }
    return count;
}

uint8_t create_uart_frame(uint8_t data, UART_Control *ctrl) {
    // Your logic here
    if (ctrl->parity_enable == 0) return data | 0x00;
    if (ctrl->parity_enable == 1) {
        if (ctrl->parity_type == 0) {   //even parity
            if ((count_ones(data) & 1) == 0) 
                return data | 0x00;
            else return data | 0x80;
        } else if (ctrl->parity_type == 1) {    //odd parity
            if ((count_ones(data) & 1) == 0) 
                return data | 0x80;
            else return data | 0x00;
        } 
    }
    return 0;
}

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