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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 ex;
    int count=0;
    if(ctrl->parity_enable == 1){
        
        int i;
        for(i=0;i<8;i++){
            ex = (data>>i) & 0x01;
            if(ex) count++;
            //printf("%d",count);
            
        }
         if(count%2 == 0 && count != 0 && count != 2){
                
                ctrl->parity_type = 0;
                data |= 0x00;
                //printf("%x",data);
            } 
            else {
                ctrl->parity_type =1;
                data |= 0x80;
                //printf("hello");
            }
    }
    else {
        //printf("hello");
        data |= 0x00;
    }

    //printf("0x%02X",data);
    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