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;

int count_bits(uint8_t data){
    int cnt = 0;
    while(data){
        if(data & 1) cnt++;
        data >>=1;
    }
    return cnt;
}

uint8_t create_uart_frame(uint8_t data, UART_Control *ctrl) {
    // Your logic here
    data &= 0x7F;
    if(ctrl->parity_enable == 0) return data;
    int ones = count_bits(data);
    uint8_t parity_bit;
    if(ctrl->parity_type == 0){
        parity_bit = (ones %2 !=0);
    }
    else parity_bit = (ones%2 == 0);
    return (parity_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