Serialized Data Buffer

#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];

    // Your logic to fill buffer
    buffer[0] = 0xA5;
    buffer[9] = 0x5A;
    buffer[1] = command;
    buffer[2] = value & 0xff;
    buffer[3] = (value>>8) & 0xff;
    buffer[4] = status;
    buffer[5] = checksum & 0xff;
    buffer[6] = (checksum>>8) & 0xff;
    buffer[7] = (checksum>>16) & 0xff;
    buffer[8] = (checksum>>24) & 0xff;

    // Then print buffer
    for(uint8_t x=0;x<10;x++)
        printf("%u ",buffer[x]);
}

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;
}