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];
    // Your logic to fill buffer
    buffer[0] = 0xA5;
    buffer[1] = command;
    buffer[2] = value & 0xFF;
    buffer[3] = (value >> 8) & 0xFF;
    buffer[4] = status;
    uint8_t* ptr = (uint8_t*)&checksum;
    for (int i = 0; i<4;i++)
    {
        buffer[5+i] = *(ptr+i);
    }
    buffer[9] = 0x5A;
    
    // 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