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) {
    // Your logic here
    uint8_t result = data;
    if(ctrl->parity_enable == 0) result &= ~(1 << 7);
    else {
        uint8_t one_counter = 0;
        while(result) {
            one_counter += result & 1;
            result >>= 1;
        }
        if(ctrl->parity_type) {
            uint8_t parity_bit = 1 - (one_counter % 2);
            result = data & ~(1 << 7);
            result |= (parity_bit << 7);
        } else {
            uint8_t parity_bit = (one_counter % 2);
            result = data & ~(1 << 7);
            result |= (parity_bit << 7);
        }
    }

    return result;
}

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