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;

uint8_t create_uart_frame(uint8_t data, UART_Control *ctrl) {
    
    uint8_t sum = 0;
    uint8_t frame = data & 0x7F;;
    uint8_t p_bit = 0;
    if(ctrl->parity_enable){
        for(size_t i = 0; i < 7; i++){
            if((data >> i) & 0x1){ sum++;}
        }
        if((ctrl->parity_type == 0)){
            p_bit = (sum % 2 == 0) ? 0 : 1;
        }
        else{
            p_bit = (sum % 2 == 0) ? 1 : 0;
        }
        frame |= (p_bit << 7);
    }
    else{
        frame &= 0x7F; 
    }
    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;
}