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) {
    // Your logic to fill buffer
    uint8_t buffer[10];
    buffer[0] = 0xA5;
    buffer[1] = command;    
    buffer[9] = 0x5A;
    for(int i = 0; i < 2; i++)
    {
        uint16_t mask = 0xFF;
        buffer[2 + i] = (uint8_t)(value & mask);
        value = value >> 8;
    }
    buffer[4] = status;
    for(int i = 0; i < 4; i++)
    {
        uint32_t mask = 0xFF;
        buffer[5 + i] = (uint8_t)(checksum & mask);
        checksum = checksum >> 8;
    }

    for (int i = 0; i < 10; i++){
        printf ("%d ", buffer[i]);
    }  
    // Then print buffer
}

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