76. Construct UART Data Frame with Parity Bit

#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) {
    uint8_t count=0;
    uint8_t val=data;
    if(ctrl->parity_enable == 1){
        while(val){
            count+=(val & 1);
            (val >>= 1);
        }
        if(ctrl->parity_type==0){
           if(count % 2==0){
                data &= ~(1<<7);
                return data;
           }
           else{
            data|=(1<<7);
            return data;
           }

        }
        else{
            if((count % 2)==0){
                data|=(1<<7);
                return data;
           }
           else{
                data&=~(1<<7);
                return data;
           }
        }
       
    }
    else{
        data&=~(1<<7);
        return 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;
}