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)
    {
        uint8_t count = 0;
        for(int n = 0 ; n < 8 ; n++)
            count += ((data>>n) & 0x01)? 1 : 0 ; 

        uint8_t parity_even = (count%2 == 0)? 1 : 0 ;  
        // odd
        if(ctrl->parity_type)
        {
            return (parity_even)? (0x80 | data ) : data  ; 
        }
        // even
        else 
        {
            return (parity_even)? data : (0x80 | data) ; 
        }
    }
    else 
    {
        return data & 0b01111111; 
    }

    return data & 0b01111111;
}

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