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,end=0x5A;
    // Your logic to fill buffer
    buffer[0]=start;
    buffer[1]=command;
    buffer[2]=(value)&0xFF;
    buffer[3]=(value>>8)&0xFF;
    buffer[4]=status;
    for (int i=0 ; i<4 ; i++){
        buffer[5+i]=(checksum>>(i*8))&0xFF;
    }
    buffer[9]=end;
    // Then print buffer
    for (int i=0 ; i<10 ; i++){
        printf("%llu ",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