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
    uint8_t count = 0;
    uint8_t temp = data; // Keep 'data' safe
    if(ctrl->parity_enable == 1) {
        while(temp > 0) {
            if(temp & 1) count++;
            temp >>= 1;
        }
    } else {
        return data;
    }

    if (ctrl->parity_type == 1) { // ODD Parity
    if ((count % 2) == 0) return (data | (1 << 7));  // Need a 1 to make it odd
    else return (data & ~(1 << 7)); // Need a 0 to keep it odd
    } 
    else { // EVEN Parity (parity_type == 0)
    if ((count % 2) != 0) return (data | (1 << 7));  // Need a 1 to make it even
    else return (data & ~(1 << 7)); // Need a 0 to keep it even
    }

    
}

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;
}