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;


uint8_t create_uart_frame(uint8_t data, UART_Control *ctrl) {
    // Your logic here
    uint8_t count = 0; 
    //Enable_parity 
    if(!(ctrl->parity_enable)) {
        data = data & ~(1 << 7);
    }

    //Odd_parity
    if(ctrl->parity_enable) {
        for(int i = 0; i < 7; i++) {
            if(((data >> i) & 1) != 0){
                count++;
            }
        }

        //Even_parity
    if(!(ctrl->parity_type)) {
        if(!(count%2)) {
            data = data & ~(1 << 7); 
        } 
        else {
            data = data | (1 <<7);
           }
        }

        //Odd_parity
    if(ctrl->parity_type) {
        if(count%2) {
            data = data & ~(1 << 7); 
        }
        else {
            data = data | (1 <<7);
        }
    }


    }
    return 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;
}

Solving Approach

 

 

 

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Input

85 1 0

Expected Output

frame = 0x55