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) {
    uint8_t frame = 0; uint8_t parity_bit = 0;

    if (ctrl->parity_enable == 0) {
            frame = data;
    }
    else {
            int count = 0;
            uint8_t data2 = data;
            while(data2) {
                data2 = data2 & (data2-1);
                count++;
            }

            if (ctrl->parity_type == 0) {
                // EVEN PARITY, 1s MUST BE EVEN
                if (count % 2 == 0) {
                // no of 1s is even
                    parity_bit = 0;
                } else {
                    parity_bit = 1;
                }

            } else {
                // ODD PARITY, 1s MUST BE ODD
                if (count % 2 == 0) {
                    parity_bit = 1;
                } else {
                    parity_bit = 0;
                }

            }

        }
        frame = (parity_bit << 7) | data;
        return 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