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) {
    // Your logic here
    int cnt=0;
    uint8_t tdata = data;
    uint8_t ret=data;

    if (ctrl->parity_enable == 0) {
        ret &= ~(1<<8);
        return ret;
    }

    for(int i=0; i<8; i++) {
        int bit = (tdata & 1);
        if(bit) cnt++;
        tdata >>= 1;
    }

    if(ctrl->parity_type == 0) {
        if (cnt % 2 == 0) { 
            ret &= ~(1<<7);
        } else {
            ret |= (1<<7); 
        }
    } else {
        if (cnt % 2 == 0) { 
            ret |= (1<<7);
        } else {
            ret &= ~(1<<7); 
        }
    }
    return ret;
}

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