Serialized Data Buffer

Code

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


#define extract(byte,pos) ((byte>>pos) & 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;

    //Parse value into 2 bytes
    uint16_t mask = 0xFF; //8 bit length
    buffer[2] = extract(value,0);
    buffer[3] = extract(value,8);
    
    buffer[4] = status;
    uint32_t mask2 = 0xFF; //8 bit length
    //parse checksum into 4 bytes
    buffer[5] = extract(checksum,0);
    buffer[6] = extract(checksum,8);
    buffer[7] = extract(checksum,16);
    buffer[8] = extract(checksum,24);

    buffer[9] = 0x5A;
    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