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 parity_bit = data;
    // for(int i=0; i<8 ;i++){
    //     parity_bit ^= data>>i;
    // }
    parity_bit = (parity_bit & 0x55) ^ ((parity_bit >> 1)& 0x55);
    parity_bit = (parity_bit & 0x33) ^ ((parity_bit >> 2)& 0x33);
    parity_bit = (parity_bit & 0x33) ^ ((parity_bit >> 4)& 0x33);


    return (data & 0x7F) | (((ctrl ->parity_enable)&(ctrl -> parity_type ^ parity_bit))<<7);
}

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;
}