Serialized Data Buffer

Code

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

void encode_uint16(uint8_t *buffer, uint16_t value) {
    buffer[0] = value & 0xFF;
    buffer[1] = (value >> 8) & 0xFF;
}

void encode_uint32(uint8_t *buffer, uint32_t value) {
    buffer[0] = value & 0xFF;
    buffer[1] = (value >> 8) & 0xFF;
    buffer[2] = (value >> 16) & 0xFF;
    buffer[3] = (value >> 24) & 0xFF;
}
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;
    encode_uint16(&buffer[2], value);
    buffer[4] = status;
    encode_uint32(&buffer[5], checksum);
    buffer[9] = 0x5A; 
      // Print buffer contents
    //printf("Packet bytes:\n");
    for (int i = 0; i < 10; i++) {
        printf("%d ", buffer[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