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) {
    // If parity not enabled, return data
    uint8_t uart_frame = data & 0X7F;
    if(ctrl->parity_enable == 0){
        return uart_frame;
    // If parity enabled, count number of 1's
    } else if (ctrl->parity_enable == 1){
        // count num bits
        int count = 0;
        for(int i=0;i<8;i++){
            count+=(data >> i) & 1;
        }
        if(ctrl->parity_type == 0){
            // if even parity but we have odd 1's
            if(count%2==1){
                uart_frame = data | (1U << 7);
            } 
        } else if (ctrl->parity_type == 1){
            // if odd parity but we have even 1's
            if(count%2==0){
                uart_frame = data | (1U << 7);
            }
        }
    }
    return uart_frame;
}

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