76. Construct UART Data Frame with Parity Bit

#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_one(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) {
    // int count=0, data_copy=0;
    data &= 0x7F;
    if(ctrl->parity_enable == 0) {
        return data;
    }
    int ones=count_one(data);
    uint8_t parity;
    if(ctrl->parity_type==0) {
        parity = (ones%2);
    }
    else {
        parity = !(ones%2);
    }

    // Your logic here
    return (parity << 7) | (data & 0x7F);
}

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;
}