Serialized Data Buffer

Code

#include <stdio.h>
#include <stdint.h>

#define EXTRACT_BYTE(value,shift) ((value>>shift)&0xff)

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] = EXTRACT_BYTE(value,0);
    buffer[3] = EXTRACT_BYTE(value,8);
    buffer[4] = EXTRACT_BYTE(status,0);
    buffer[5] = EXTRACT_BYTE(checksum,0);
    buffer[6] = EXTRACT_BYTE(checksum,8);
    buffer[7] = EXTRACT_BYTE(checksum,16);
    buffer[8] = EXTRACT_BYTE(checksum,24);
    buffer[9] = 0x5A;
    for(int i=0;i<10;i++){
        printf("%d ",buffer[i]);
    }
    // Your logic to fill buffer
    // 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