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
    int cnt = 0;
    int parity_bit;

    if (ctrl->parity_enable == 0) {
        return data;  // No parity, MSB is 0
    }

        for(int i=0;i<8;i++){

            if((data >> i) & 1)
                cnt++; 
        }

        if(ctrl->parity_type == 0){

           parity_bit = (cnt % 2 == 0) ? 0 : 1;

        } else {

            parity_bit = (cnt % 2 == 0) ? 1 : 0;

        }


    return data | (parity_bit << 7);
    
}

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