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) {
    // keep only  7 bits 
    uint8_t d = data & 0x7F; 

    if(ctrl-> parity_enable ==0)
    {
        return d;
    }

    uint8_t count =0;
    uint8_t parity_bit;
    for(uint8_t  i=0 ;i<7 ;i++)
    {
        if((d>>i)&0x01)
        {
            count++;
        }
    }

    uint8_t p  = count&0x01;
    if(ctrl->parity_type == 0)
    {
        // even parity bit
        parity_bit = p;
    }else
    {
        parity_bit = p^ 0x01;
    }

    return (uint8_t)((parity_bit <<7)|d);
 
}

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