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
    if(!ctrl->parity_enable){
        return data & 0x7F;
    }
    uint8_t ones = 0;
    for(int i = 0; i < 8; i++){
        if((data >> i) & 1)
            ones++;
    }
    uint8_t parity_bits = 0;
    if(ctrl->parity_type == 0){
        parity_bits = (ones % 2 != 0 ? 1 : 0);
    }else{
        parity_bits = (ones % 2 == 0 ? 1 : 0);
    }
    return (parity_bits << 7) | (data & 0x7F);
}

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;
}