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;       // Command
    // Value (16-bit)
    buffer[2] = value & 0xFF;        // LSB
    buffer[3] = (value >> 8) & 0xFF; // MSB

    buffer[4] = status;        // Status byte

    // Checksum (32-bit -> 4 bytes)
    buffer[5] = checksum & 0xFF;
    buffer[6] = (checksum >> 8) & 0xFF;
    buffer[7] = (checksum >> 16) & 0xFF;
    buffer[8] = (checksum >> 24) & 0xFF;

    buffer[9] = 0x5A;          // End byte

    // Print buffer
    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