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 count_setbits(uint8_t val){
    uint8_t count = 0;
    while(val != 0){
        count++;
        val = val&(val-1);
    }
    return count;
}

uint8_t create_uart_frame(uint8_t data, UART_Control *ctrl) {
    // Your logic here
    uint8_t set_bit = 0;
    if(ctrl->parity_enable){
        uint8_t cnt = count_setbits(data);
        set_bit = (ctrl->parity_type == 0)&&(cnt&0x1);
        set_bit |= (ctrl->parity_type)&&((cnt&0x1) == 0);
    }
    return (set_bit<<7)|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