Extract Packet Fields from Byte Stream

Code

#include <stdio.h>
#include <stdint.h>

typedef struct {
    uint8_t start;
    uint8_t command;
    uint16_t data;
    uint8_t crc;
    uint8_t end;
} Packet;

void print_packet_fields(uint8_t *buffer) {
    // Overlay struct and print values
    Packet p;
     p.start=*(buffer);
     p.command=*(buffer+1);
     p.data=((*(buffer+3)+0x0000)<<8)+*(buffer+2);
     p.crc=*(buffer+4);
     p.end=*(buffer+5);
     printf("Start: %u\n",p.start);
     printf("Command: %u\n",p.command);
     printf("Data: %lu\n",p.data);
     printf("CRC: %u\n",p.crc);
     printf("End: %u",p.end);

}

int main() {
    uint8_t buffer[6];
    for (int i = 0; i < 6; i++) {
        scanf("%hhu", &buffer[i]);
    }
    print_packet_fields(buffer);
    return 0;
}

Solving Approach

 

 

 

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Input

165 1 52 18 119 90

Expected Output

Start: 165 Command: 1 Data: 4660 CRC: 119 End: 90