76. Construct UART Data Frame with Parity Bit

#include <stdio.h>
#include <stdint.h>

typedef struct {
    uint8_t parity_enable : 1;   // 0 = Disabled, 1 = Enabled
    uint8_t parity_type   : 1;   // 0 = Even parity, 1 = Odd parity
    uint8_t reserved      : 6;   // Reserved bits
} UART_Control;

uint8_t create_uart_frame(uint8_t data, UART_Control *ctrl) {
    // Your logic here
    if (ctrl->parity_enable == 0)
    {
        return data;
    }

    int cnt = 0;
    for(int i = 0; i < 7; i++)
    {
        if(data & (1 << i))
        {
            cnt++;
        }
    }
    
    uint8_t parity_bit;

    if(ctrl->parity_type == 0)
    {
        parity_bit = cnt % 2;
    }
    else parity_bit = !(cnt % 2);

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

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;
}