linux 向usb发送数据包

#include <stdio.h>
#include <stdlib.h>
#include <libusb-1.0/libusb.h>

#define VENDOR_ID  0x1234
#define PRODUCT_ID 0x5678

int main() {
    libusb_device_handle *handle;
    int r;

    // 初始化libusb
    r = libusb_init(NULL);
    if (r < 0) {
        fprintf(stderr, "Init Error %d\n", r);
        return 1;
    }

    // 打开设备
    handle = libusb_open_device_with_vid_pid(NULL, VENDOR_ID, PRODUCT_ID);
    if (handle == NULL) {
        fprintf(stderr, "Cannot open device\n");
        libusb_exit(NULL);
        return 1;
    }

    // 设置配置
    r = libusb_set_configuration(handle, 1);
    if (r != LIBUSB_SUCCESS) {
        fprintf(stderr, "Set Configuration Error %d\n", r);
        libusb_close(handle);
        libusb_exit(NULL);
        return 1;
    }

    // 获取接口
    r = libusb_claim_interface(handle, 0);
    if (r != LIBUSB_SUCCESS) {
        fprintf(stderr, "Claim Interface Error %d\n", r);
        libusb_close(handle);
        libusb_exit(NULL);
        return 1;
    }

    // 发送数据
    unsigned char data[] = {0x01, 0x02, 0x03, 0x04};
    int transferred;
    r = libusb_bulk_transfer(handle, LIBUSB_ENDPOINT_OUT | 0x01, data, sizeof(data), &transferred, 0);
    if (r != LIBUSB_SUCCESS) {
        fprintf(stderr, "Bulk Transfer Error %d\n", r);
    } else {
        printf("Transferred %d bytes\n", transferred);
    }

    // 释放接口和关闭设备
    libusb_release_interface(handle, 0);
    libusb_close(handle);
    libusb_exit(NULL);

    return 0;
}