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;
int count_ones(uint8_t data) {
    int count = 0;
    while (data) {
        count += data & 1;
        data >>= 1;
    }
    return count;
}

uint8_t create_uart_frame(uint8_t data, UART_Control *ctrl) {
    // Your logic here
    data &= 0x7f ; // keep only 7 bits 

     if(ctrl->parity_enable==0)
     {
        return data ;
     }
       int ones = count_ones(data);
    uint8_t parity_bit;

    if (ctrl->parity_type == 0) { // Even parity
        parity_bit = (ones % 2 != 0);  
    } else { // Odd parity
        parity_bit = (ones % 2 == 0);
    }
    
    //set priority  
    return (parity_bit << 7) | data;  // Set parity as MSB
}


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