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;

uint8_t create_uart_frame(uint8_t data, UART_Control *ctrl) {
    uint8_t frame = 0;
    uint8_t parityFlag = 0;
    
    frame = data;

    if (1 == ctrl->parity_enable)
    {
        // parity enabled
        uint8_t ones = 0;
        for (uint8_t i = 0; i < 8; i++)
        {
            if (((data >> i) & 0x1) == 1)
            {
                ones++;
            }
        }

        if (0 == ctrl->parity_type)
        {
            // even parity
            parityFlag = (ones % 2 == 1) ? 1 : 0;
        }
        else if (1 == ctrl->parity_type)
        {
            // odd parity
            parityFlag = (ones % 2 == 0) ? 1 : 0;
        }
        else
        {
            // do nothing
        }
    }
    else
    {
        // parity disabled
        parityFlag = 0;
    }

    if (parityFlag == 1)
    {
        frame |= (1 << 7);
    }
    else
    {
        frame &= (~(1 << 7));
    }

    return frame;
}

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