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];
    void *ptr = &value;
    buffer[0] = 0xA5;
    buffer[1] = command;
    buffer[2] = *(char*)ptr;
    buffer[3] = *(char*)(ptr+1);
    buffer[4] = status;
    ptr = &checksum;
    buffer[5] = *(char*)ptr;
    buffer[6] = *(char*)(ptr+1);
    buffer[7] = *(char*)(ptr+2);
    buffer[8] = *(char*)(ptr+3);
    buffer[9] = 0x5A;

    // Your logic to fill buffer
    // Then 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