Serialized Data Buffer

Code

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

// #define set_start(buf,x) (buf|=x)
// #define set_command(buf,x) (buf|=(x<<1))
// #define set_val(buf,x) (buf|=(x<<2))

void build_packet(uint8_t command, uint16_t value, uint8_t status, uint32_t checksum) {
    uint8_t buffer[10];
    uint8_t mask=0xFF;

    // Your logic to fill buffer
    buffer[0]=0xA5;
    buffer[1]=command;
    buffer[2]=value;
    buffer[3]=value>>8;
    buffer[4]=status;
    for (int i=0;i<4;i++){
        buffer[i+5]=checksum>>8*i;
    }
    buffer[9]=0x5A;
    // 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