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;

#define CLEAR_PARITY_BIT(data) (data &= ~(1 << 7))
#define SET_PARITY_BIT(data, val) (data |= (val << 7))

uint8_t create_uart_frame(uint8_t data, UART_Control *ctrl) {
    // Your logic here
    CLEAR_PARITY_BIT(data);

    if(ctrl->parity_enable)
    {
        uint32_t parity_count = 0;
        for(int i = 0; i < 8; i++)
        {
            if ((data & (1 << i)) != 0)
            {
                parity_count += 1; 
            }
        }

        // Odd parity
        if (ctrl->parity_type)
        {
            if (parity_count % 2 == 0)
            {
                // Set parity bit to 1
                SET_PARITY_BIT(data, 1);
            }
            else
            {
                // Set parity bit to 0
                SET_PARITY_BIT(data, 0);
            }
        }
        // Even parity
        else
        {
            if (parity_count % 2 == 0)
            {
                // Set parity bit to 0
                SET_PARITY_BIT(data, 0);
            }
            else
            {
                // Set parity bit to 1
                SET_PARITY_BIT(data, 1);
            }
        }

    }

    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;
}

Solving Approach