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];
    uint8_t start = 0xA5;
    uint8_t end = 0x5A;
    // Your logic to fill buffer
    buffer[0] = start;
    buffer[9] = end;
    buffer[1] = command;
    buffer[2] = value & 0xFF ;
    buffer[3] = (value >> 8) & 0xFF;
    buffer[4] = status;
    buffer[5] = (checksum >>0) & 0xFF;
    buffer[6] = (checksum >> 8) & 0xFF;
    buffer[7] = (checksum >> 16) & 0xFF;
    buffer[8] = (checksum >> 24) & 0xFF;

    // 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

/*
Serialize Data Buffer
10 bytes of data
Start - 0xA5 - 165 
Cmd   - User input
Value - 16 bit data
Status - 0/1
Checksum - 32 bit value
End    - 0x5A (0101_1010) -> 2^1 + 2^3 + 2^4 + 2^6 = 2 + 8 + 16 + 64 = 26 + 64 = 90

Input:
Command = 0x01
Value = 0x1234
Status = 1
Checksum = 0xAABBCCDD
Output:
165 1 52 18 1 221 204 187 170 90

*/