Serialized Data Buffer

Code

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

typedef struct {
    uint8_t start;
    uint8_t command;
    uint16_t value;
    uint8_t status;
    uint32_t checksum;
    uint8_t end;
} UART_t;

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] = value & 0xFF;
    buffer[3] = (value & 0xFF00) >> 8;
    buffer[4] = status;
    buffer[5] = checksum & 0xFF;
    buffer[6] = (checksum>>8) & 0xFF;
    buffer[7] = (checksum>>16) & 0xFF;
    buffer[8] = (checksum>>24) & 0xFF;
    buffer[9] = 0x5A;

    for (int i=0; i<10; i++) {
        printf("%u", 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;
}

Solving Approach