45. Serialized Data Buffer

#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];

                buffer[0] = 0xA5;        // Start
                    buffer[1] = command;     // Command

                        // Value (little endian)
                            buffer[2] = value & 0xFF;
                                buffer[3] = (value >> 8) & 0xFF;

                                    buffer[4] = status;      // Status

                                        // Checksum (little endian)
                                            buffer[5] = checksum & 0xFF;
                                                buffer[6] = (checksum >> 8) & 0xFF;
                                                    buffer[7] = (checksum >> 16) & 0xFF;
                                                        buffer[8] = (checksum >> 24) & 0xFF;

                                                            buffer[9] = 0x5A;        // End

                                                                // Print buffer
                                                                    for(int i = 0; i < 10; i++) {
                                                                            printf("%d", buffer[i]);
                                                                                    if(i < 9) printf(" ");
                                                                                        }
                                                                                        }

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;
}