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 mask = 1 << 7;

    if(ctrl->parity_enable == 0){
        return (data & ~mask);
    }

    
        int numones = 0;
        int bitmask = 1;
        for(int i = 0; i< 7; i++){
            if((data & bitmask) != 0){
                numones ++;
            }
            bitmask = bitmask << 1;
        }

        if(ctrl->parity_type == 0){
            if(numones % 2 == 0){
                return  data & (~mask);
            }
                return data | mask;
        }else{
            if(numones % 2 == 0){
                return data | mask;
            }
            return data & (~mask);
        }



    
    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