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 buff[10];
    uint8_t buff_index = 0;
    
    buff[buff_index++] = 0xA5;
    buff[buff_index++] = command;
    buff[buff_index++] = (value & 0xFF);
    buff[buff_index++] = ((value >> 8) & 0xFF);
    buff[buff_index++] = status;
    buff[buff_index++] = (checksum & 0xFF);
    buff[buff_index++] = ((checksum >> 8) & 0xFF);
    buff[buff_index++] = ((checksum >> 16) & 0xFF);
    buff[buff_index++] = ((checksum >> 24) & 0xFF);
    buff[buff_index++] = 0x5A;

    for (uint8_t i = 0; i < 10; i++) {
        printf("%d ", buff[i]);
    }
    printf("\n");
}

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