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;
    buffer[1] = command;
    buffer[2] = value & 0xFF;
    buffer[3] = (value >> 8) & 0xFF;
    buffer[4] = status;
    buffer[5] = checksum & 0xFF;
    buffer[6] = (checksum >> 8) & 0xFF;
    buffer[7] = (checksum >> 16) & 0xFF;
    buffer[8] = (checksum >> 24) & 0xFF;
    buffer[9] = 0x5A;

    for (int i = 0; i < 10; i++){
        printf("%u ", 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

• Create a 10-byte buffer.
• Fill bytes in order → Start, Command, Value (split into 2 bytes), Status, Checksum (split into 4 bytes), End.
• Use bitwise shifts (>>, & 0xFF) to extract each byte.
• Print all bytes as integers.