Serialized Data Buffer

Code

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

void build_packet(uint8_t command, uint16_t val, uint8_t status, uint32_t checksum) {
    uint8_t buffer[10];
    int i=0,j=0,reg=4;
    uint16_t bit;
    buffer[i++]=165;
    buffer[i++]=command;
    bit=val&0xFF;
    buffer[i++]=bit;
    bit=val>>8;
     buffer[i++]=bit;
      buffer[i++]=status;
      while(reg){
        bit=(checksum>>8*j)&0xFF;
        j++;
        buffer[i++]=bit;
        reg--;
      }
     buffer[i++]=90;
    for(int i=0;i<10;i++){
        printf("%d ",buffer[i]);
    }
}

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