Serialized Data Buffer

Code

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

void build_packet(uint8_t command, uint16_t value, uint8_t status, uint32_t checksum) {
    uint8_t buffer[10];

//     buffer[0] = 0xA5;
//     buffer[1]= command;
//     buffer[2]= value & 0x00FF;
//     buffer[3] = value>>8;
//     buffer[4] = status;

//     buffer[5] = uint8_t(checksum & 0x000000FF);
//      buffer[6] = uint8_t ((checksum & 0x0000FF00)>>8);
//       buffer[7] = uint8_t((checksum & 0x00FF0000)>>16);
//        buffer[8] = uint8_t((checksum & 0xFF000000)>>24); 

// buffer [9]= 0x5A;




    buffer[0] = 0xA5;
    buffer[1]= command;
    buffer[4] = status;
    buffer [9]= 0x5A;

    uint16_t *val_buff = (uint16_t*)(buffer+2);
    *val_buff = value;

    uint32_t *chck_buf = (uint32_t*)(buffer+5);
    *chck_buf = checksum;


    // memcpy(&buffer[2], &value, 2);
    // buffer[4]=status;
    // memcpy(&buffer[5],&checksum,4);


    for(int i=0;i<10;i++){
        printf("%d ", buffer[i]);
    }




/*
#define START_offset       (0)
#define COMMAND_offset     (1)
#define VALUE_offset       (2)
#define STATUS_offset      (4)
#define CHECKSUM_offset    (5)
#define END_offset         (9)


    *(buffer + START_offset) = 0xA5;
    *(buffer + COMMAND_offset) = command;
    *(uint16_t*)(buffer + VALUE_offset) = value;
    *(buffer + STATUS_offset) = status;
    *(uint32_t*)(buffer + CHECKSUM_offset) = checksum;
    *(buffer + END_offset) = 0x5A;



*/
}

int main() {
    uint8_t cmd, status;
    uint16_t val;
    uint32_t crc;

    scanf("%hhu %hu %hhu %u", &cmd, &val, &status, &crc);
    build_packet(cmd, val, status, crc);
    return 0;
}

Solving Approach