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_number_of_set_bits(uint8_t data){
    // return __builtin_popcount(data);
    uint8_t count=0;
    while(data){
        data &= (data-1);
        count++;
    }
    return count;
}

uint8_t create_uart_frame(uint8_t data, UART_Control *ctrl) {
    // Your logic here

    if (ctrl->parity_enable) {
        // check parity:
        uint8_t num_of_set_bits = count_number_of_set_bits(data);
        if (num_of_set_bits%2== ctrl->parity_type){
            return  data;

        }
        else{
            return (0x80) | data;
        }

    }

    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