Construct UART Data Frame with Parity Bit

Code

#include <stdio.h>
#include <stdint.h>

#define PARITY_EN   1
#define PARITY_DI   0

#define PARITY_ODD  1
#define PARITY_EVEN 0

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
    

    if(ctrl->parity_enable == PARITY_DI){
        return data;
    }
    else {
        uint8_t data_count = 0;
        uint8_t data_temp = data;
        while(data_temp){
            data_temp &= (data_temp - 1);
            data_count++; // count 1s in data
        }

        if(ctrl->parity_type == PARITY_EVEN){
            if(data_count % 2){
                data |= (1 << 7); // set MSB since parity type is even and the 1s are odd
            }
        }
        else {
            if(!(data_count % 2)){
                data |= (1 << 7); // set MSB since parity type is ODD and 1s are even
            }
        }
        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