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
    buffer[1] = command;                    // Command
    buffer[2] = value & 0xFF;               // Value (lower)
    buffer[3] = (value >> 8) & 0xFF;        // Value (upper)
    buffer[4] = status;                     // Status
    buffer[5] = checksum & 0xFF;            // CRC[0]
    buffer[6] = (checksum >>  8) & 0xFF;    // CRC[1]
    buffer[7] = (checksum >> 16) & 0xFF;    // CRC[2]
    buffer[8] = (checksum >> 24) & 0xFF;    // CRC[3]
    buffer[9] = 0x5A;                       // End
    for (int i = 0; i < sizeof(buffer); i++) {
        printf("%d", 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