linux 向usb发送数据

#include <stdio.h>
#include <stdlib.h>
#include <libusb.h>

#define VENDOR_ID  0x1234
#define PRODUCT_ID 0x5678
#define ENDPOINT_OUT 0x01

int main() {
    libusb_device_handle *handle;
    int transferred;
    unsigned char data[] = "Hello, USB!";

    // 初始化libusb
    if (libusb_init(NULL) < 0) {
        fprintf(stderr, "Failed to initialize libusb\n");
        return 1;
    }

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

    // 获取设备权限（可能需要root权限）
    if (libusb_claim_interface(handle, 0) < 0) {
        fprintf(stderr, "Could not claim interface\n");
        libusb_close(handle);
        libusb_exit(NULL);
        return 1;
    }

    // 发送数据
    if (libusb_bulk_transfer(handle, ENDPOINT_OUT, data, sizeof(data), &transferred, 0) < 0) {
        fprintf(stderr, "Bulk transfer failed\n");
    } else {
        printf("Sent %d bytes to USB device\n", transferred);
    }

    // 清理
    libusb_release_interface(handle, 0);
    libusb_close(handle);
    libusb_exit(NULL);

    return 0;
}