Serialized Data Buffer

Code

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

void build_packet(uint8_t command, uint16_t value, uint8_t status, uint32_t checksum) {
    const uint8_t start_val = 0xA5; 
    const uint8_t end_val = 0x5A; 
    uint8_t buffer[10];
    memset(buffer, 0, sizeof(buffer));

    buffer[0] = start_val; 
    buffer[1] = command; 
    buffer[2] = (uint8_t)value; // little endian
    buffer[3] = (uint8_t)(value >> 8);
    buffer[4] = status;
    buffer[5] = (uint8_t)checksum; // little endian
    buffer[6] = (uint8_t)(checksum >> 8);
    buffer[7] = (uint8_t)(checksum >> 16);
    buffer[8] = (uint8_t)(checksum >> 24);
    buffer[9] = end_val; 

    for (int i = 0; i < sizeof(buffer); i++)
    {
        printf("%u", buffer[i]); 
        if (i < sizeof(buffer) - 1)
        {
            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