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) {
    // Your logic here
    uint8_t ans;
    if ((*ctrl).parity_enable == 0) {
        ans = data & 0x7F;
    }
    else {
        uint8_t data_cp = data;
        int count = 0;
        while (data_cp > 0) {
            count += (1 & data_cp);
            data_cp = data_cp >> 1;
        }
        if ((*ctrl).parity_type == 0) {
            if (count % 2 == 0) {
                ans = data & 0x7F;
            }
            else {
                ans = 1 << 7;
                ans = data | ans;
            }
        }
        else {
            if (count % 2 == 0) {
                ans = 1 << 7;
                ans = data | ans;
            }
            else {
                ans = data & 0x7F;
            }
        }
    }
    return ans;
}

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;
}