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_ones(uint8_t data) {
    int count =0; 
    for (int j=0; j<7; j++) {
        if (data&(1<<j)) {
            count++;
        }
    }
    return count; 
}

uint8_t create_uart_frame(uint8_t data, UART_Control *ctrl) {
    // Your logic here
    data = data&0x7F;  
    if (ctrl->parity_enable==0){
        return data; 
    }

    int ones = count_ones(data); 
    int parity_bit; 

    if (ctrl->parity_type==0) {
        parity_bit= (ones%2==0)? 0 : 1;
    }
    else {
        parity_bit = (ones%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