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 set_bits(uint8_t data){
    uint8_t number_of_set_bits = 0;
    
    for(uint8_t i = 0; i < 7; i++){
        if((data >> i) & 1u){
            number_of_set_bits++;
        } 
    }
    
    return number_of_set_bits;
}

uint8_t is_even(uint8_t number_of_bits_set){
    if((number_of_bits_set % 2 == 0)){
        return 1;
    }
    
    return 0;
}

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

    uint8_t uart_frame = 0;
    uint8_t parity_bit = 0;
    
    if(ctrl->parity_enable){
        if(!ctrl->parity_type){
            if(!is_even(set_bits(data))){
                parity_bit = 1;
            }
        } else {
            if(is_even(set_bits(data))){
                parity_bit = 1;
            }
        }
    }
    
    uart_frame = (parity_bit << 7) | data;

    return uart_frame;
}

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