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) {
    // Your logic here
    
    data = data & 0x7F;   // Ensure only 7-bit data

    uint8_t parity_bit = 0;

    if (ctrl->parity_enable) {
        // Count number of 1s
        uint8_t count = 0;
        for (int i = 0; i < 7; i++) {
            if (data & (1 << i)) {
                count++;
            }
        }

        if (ctrl->parity_type == 0) {
            // Even parity
            parity_bit = (count % 2 != 0);  // 1 if odd, else 0
        } else {
            // Odd parity
            parity_bit = (count % 2 == 0);  // 1 if even, else 0
        }
    } else {
        parity_bit = 0;  // MSB = 0 if parity disabled
    }

    // Combine parity bit (MSB) and data
    return (parity_bit << 7) | data;
}

   


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;
}