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;             //start byte
    buffer[1]=command & 0xFF;   //command byte
    buffer[2]=value & 0xFF;         //lsb byte of 16 bit value
    buffer[3]=(value >> 8) & 0xFF;  //msb byte of 16 bit value 
    buffer[4]=status;               //status byte
    buffer[5]=checksum & 0xFF;          //checksum lsb byte
    buffer[6]=(checksum >> 8) & 0xFF;
    buffer[7]=(checksum >> 16) & 0xFF;
    buffer[8]=(checksum >> 24) & 0xFF;  //checksum msb byte
    buffer[9]=0x5A;                     //end byte

    for(int i=0;i<=9;i++){
        printf("%u",buffer[i]);
        printf(" ");
    }
}

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