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
    if(ctrl->parity_enable == 0)
        return (data & ~(1<<7));
    else
        if(ctrl->parity_type == 0)
        {
            uint8_t cnt = 0;
            uint8_t d = data;
            for(int i = 0; i<7; ++i)
            {
                if (d & 0x1)
                    cnt++;
                d>>=1;
            }
            if(cnt%2==0)
                data &= ~(1<<7);
            else
                data |= (1<<7);
        }
        else if(ctrl->parity_type == 1)
        {
            uint8_t cnt = 0;
            uint8_t d = data;
            for(int i = 0; i<7; ++i)
            {
                if (d & 0x1)
                    cnt++;
                d>>=1;
            }
            if(cnt%2==1)
                data &= ~(1<<7);
            else
                data |= (1<<7);
        }

    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