IEEE 802.15.4 subsystem
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1 | /* |
2 | * usbperf/usbperf.c - Measure the rate of control transfers a device can do |
3 | * |
4 | * Written 2011 by Werner Almesberger |
5 | * Copyright 2011 Werner Almesberger |
6 | * |
7 | * This program is free software; you can redistribute it and/or modify |
8 | * it under the terms of the GNU General Public License as published by |
9 | * the Free Software Foundation; either version 2 of the License, or |
10 | * (at your option) any later version. |
11 | */ |
12 | |
13 | |
14 | #include <stdlib.h> |
15 | #include <stdio.h> |
16 | #include <unistd.h> |
17 | #include <dirent.h> |
18 | #include <sys/time.h> |
19 | |
20 | #include <usb.h> |
21 | |
22 | #include "usbopen.h" |
23 | |
24 | |
25 | #define SYSFS_USB_BASE "/sys/bus/usb/devices" |
26 | |
27 | |
28 | static void speed(usb_dev_handle *dev) |
29 | { |
30 | struct usb_device *device = usb_device(dev); |
31 | struct usb_bus *bus = device->bus; |
32 | DIR *dir; |
33 | const struct dirent *de; |
34 | char buf[1000]; /* @@@ plenty :) */ |
35 | FILE *file; |
36 | int res, devnum; |
37 | float speed; |
38 | |
39 | dir = opendir(SYSFS_USB_BASE); |
40 | if (!dir) { |
41 | perror(SYSFS_USB_BASE); |
42 | exit(1); |
43 | } |
44 | |
45 | while ((de = readdir(dir))) { |
46 | if (atoi(de->d_name) != atoi(bus->dirname)) |
47 | continue; |
48 | |
49 | sprintf(buf, SYSFS_USB_BASE "/%s/devnum", de->d_name); |
50 | file = fopen(buf, "r"); |
51 | if (!file) |
52 | continue; |
53 | res = fscanf(file, "%d", &devnum); |
54 | fclose(file); |
55 | |
56 | if (res != 1 || devnum != atoi(device->filename)) |
57 | continue; |
58 | |
59 | sprintf(buf, SYSFS_USB_BASE "/%s/speed", de->d_name); |
60 | file = fopen(buf, "r"); |
61 | if (!file) |
62 | continue; |
63 | res = fscanf(file, "%f", &speed); |
64 | fclose(file); |
65 | |
66 | printf("%g Mbps\n", speed); |
67 | } |
68 | closedir(dir); |
69 | } |
70 | |
71 | |
72 | static void rounds(usb_dev_handle *dev, int n) |
73 | { |
74 | struct timeval t0, t1, t2; |
75 | double s = 0, d; |
76 | char buf; |
77 | int i, res; |
78 | |
79 | gettimeofday(&t0, NULL); |
80 | for (i = 0; i != n; i++) { |
81 | gettimeofday(&t1, NULL); |
82 | /* GET_CONFIGURATION */ |
83 | res = usb_control_msg(dev, USB_ENDPOINT_IN | USB_RECIP_DEVICE, |
84 | USB_REQ_GET_CONFIGURATION, 0, 0, &buf, 1, 1000); |
85 | if (res < 0) |
86 | fprintf(stderr, "usb_control_msg returns %d\n", res); |
87 | gettimeofday(&t2, NULL); |
88 | s += (t2.tv_sec-t1.tv_sec)+(t2.tv_usec-t1.tv_usec)*1e-6; |
89 | |
90 | } |
91 | d = (t2.tv_sec-t0.tv_sec)+(t2.tv_usec-t0.tv_usec)*1e-6; |
92 | printf("Overall: %.3f ms/req\n", d/n*1000.0); |
93 | printf("Each: %.3f ms/req\n", s/n*1000.0); |
94 | } |
95 | |
96 | |
97 | static void usage(const char *name) |
98 | { |
99 | fprintf(stderr, |
100 | "usage: %s [vendor]:[product] [rounds]\n" |
101 | , name); |
102 | exit(1); |
103 | } |
104 | |
105 | |
106 | int main(int argc, char **argv) |
107 | { |
108 | usb_dev_handle *dev; |
109 | int n = 1000; |
110 | |
111 | switch (argc) { |
112 | case 2: |
113 | break; |
114 | case 3: |
115 | n = atoi(argv[2]); |
116 | if (n <= 0) |
117 | usage(*argv); |
118 | break; |
119 | default: |
120 | usage(*argv); |
121 | } |
122 | |
123 | parse_usb_id(argv[1]); |
124 | dev = open_usb(0, 0); |
125 | if (!dev) |
126 | return 1; |
127 | |
128 | speed(dev); |
129 | rounds(dev, n); |
130 | |
131 | return 0; |
132 | } |
133 |