截取usb数据包，控制usb设备----Relay设备

 1 /* It is a simple testing */
 2 
 3 #include </usr/local/include/libusb-1.0/libusb.h>  // libusb head file
 4 #include <stdio.h>
 5 #include <sys/types.h>
 6 #include <string.h>
 7 
 8 #define VID 0x16c0      // get of lsusb
 9 #define PID 0x05df      // get of lsusb
10 
11 struct libusb_device_handle *devh = NULL;
12 
13 //unsigned char openstr[] = {0xa1, 0x01, 0x00, 0x03, 0x00, 0x00, 0x08, 0x00};
14 
15 int main()
16 {
17     /* usb init before libusb_open* */
18     int ret = libusb_init(NULL);
19     if (ret < 0) {
20         perror("libusb_init");
21         return ret;
22     }
23     /* end */
24 
25     /* open device with vid and pid, must after libusb_init */
26     devh = libusb_open_device_with_vid_pid(NULL, VID, PID);
27     if (!devh) {
28         perror("libusb_open_device_with_pid_vid");
29         libusb_exit(NULL);
30     }
31     /* end */
32 
33     /* claim interface */
34     ret = libusb_claim_interface(devh, 0);
35     if (ret < 0) {
36         perror("libusb_claim_interface");
37         devh = NULL;
38         libusb_close(devh);
39         return ret;
40     }
41     /* end */
42 
43     /* open device data */
44     unsigned char open_data[8];
45     memset(open_data, 0, sizeof(open_data));
46     if ( 0 > libusb_control_transfer(devh, 0xa1, 0x01, 0x3000, 0x00, open_data, 0x08, 1000)) {
47         perror("libusb_control_transfer");
48     }
49     printf("receive data: %s\n", open_data);
50     int i = 0;
51     for(i = 0; i < 8; i++) {
52         printf("%02x\t", open_data[i]);
53     }
54     putchar(10);
55     /* end */
56 
57     /* lock relay */
58     unsigned char lock_data[] = {0xff, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
59     if (0 > libusb_control_transfer(devh, 0x21, 0x09, 0x0000, 0x00, lock_data, 0x08, 1000)) {
60         perror("libusb_control_transfer");
61     }
62     /* end */
63 
64     /* delay */
65     sleep(2);
66 
67     /* unlock relay */
68     unsigned char unlock_data[] = {0xfd, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
69     if (0 > libusb_control_transfer(devh, 0x21, 0x09, 0x3000, 0x00, unlock_data, 0x08, 1000)) {
70         perror("libusb_control_transfer");
71     }
72     /* end */
73 
74     /* release claim interface */
75     libusb_release_interface(devh, 0);
76     /* end */
77 
78     /* close device */
79     libusb_close(devh);
80 
81     return 0;
82 }