| /* |
| * libusb example program to measure Atmel SAM3U isochronous performance |
| * Copyright (C) 2012 Harald Welte <laforge@gnumonks.org> |
| * |
| * Copied with the author's permission under LGPL-2.1 from |
| * http://git.gnumonks.org/cgi-bin/gitweb.cgi?p=sam3u-tests.git;a=blob;f=usb-benchmark-project/host/benchmark.c;h=74959f7ee88f1597286cd435f312a8ff52c56b7e |
| * |
| * An Atmel SAM3U test firmware is also available in the above repository. |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * This library is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with this library; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| #include <unistd.h> |
| #include <stdlib.h> |
| #include <stdio.h> |
| #include <errno.h> |
| #include <signal.h> |
| |
| #include "libusb.h" |
| |
| |
| #define EP_DATA_IN 0x82 |
| #define EP_ISO_IN 0x86 |
| |
| static int do_exit = 0; |
| static struct libusb_device_handle *devh = NULL; |
| |
| static unsigned long num_bytes = 0, num_xfer = 0; |
| static struct timeval tv_start; |
| |
| static void LIBUSB_CALL cb_xfr(struct libusb_transfer *xfr) |
| { |
| int i; |
| |
| if (xfr->status != LIBUSB_TRANSFER_COMPLETED) { |
| fprintf(stderr, "transfer status %d\n", xfr->status); |
| libusb_free_transfer(xfr); |
| exit(3); |
| } |
| |
| if (xfr->type == LIBUSB_TRANSFER_TYPE_ISOCHRONOUS) { |
| for (i = 0; i < xfr->num_iso_packets; i++) { |
| struct libusb_iso_packet_descriptor *pack = &xfr->iso_packet_desc[i]; |
| |
| if (pack->status != LIBUSB_TRANSFER_COMPLETED) { |
| fprintf(stderr, "Error: pack %d status %d\n", i, pack->status); |
| exit(5); |
| } |
| |
| printf("pack%d length:%u, actual_length:%u\n", i, pack->length, pack->actual_length); |
| } |
| } |
| |
| printf("length:%u, actual_length:%u\n", xfr->length, xfr->actual_length); |
| for (i = 0; i < xfr->actual_length; i++) { |
| printf("%02x", xfr->buffer[i]); |
| if (i % 16) |
| printf("\n"); |
| else if (i % 8) |
| printf(" "); |
| else |
| printf(" "); |
| } |
| num_bytes += xfr->actual_length; |
| num_xfer++; |
| |
| if (libusb_submit_transfer(xfr) < 0) { |
| fprintf(stderr, "error re-submitting URB\n"); |
| exit(1); |
| } |
| } |
| |
| static int benchmark_in(uint8_t ep) |
| { |
| static uint8_t buf[2048]; |
| static struct libusb_transfer *xfr; |
| int num_iso_pack = 0; |
| |
| if (ep == EP_ISO_IN) |
| num_iso_pack = 16; |
| |
| xfr = libusb_alloc_transfer(num_iso_pack); |
| if (!xfr) |
| return -ENOMEM; |
| |
| if (ep == EP_ISO_IN) { |
| libusb_fill_iso_transfer(xfr, devh, ep, buf, |
| sizeof(buf), num_iso_pack, cb_xfr, NULL, 0); |
| libusb_set_iso_packet_lengths(xfr, sizeof(buf)/num_iso_pack); |
| } else |
| libusb_fill_bulk_transfer(xfr, devh, ep, buf, |
| sizeof(buf), cb_xfr, NULL, 0); |
| |
| gettimeofday(&tv_start, NULL); |
| |
| /* NOTE: To reach maximum possible performance the program must |
| * submit *multiple* transfers here, not just one. |
| * |
| * When only one transfer is submitted there is a gap in the bus |
| * schedule from when the transfer completes until a new transfer |
| * is submitted by the callback. This causes some jitter for |
| * isochronous transfers and loss of throughput for bulk transfers. |
| * |
| * This is avoided by queueing multiple transfers in advance, so |
| * that the host controller is always kept busy, and will schedule |
| * more transfers on the bus while the callback is running for |
| * transfers which have completed on the bus. |
| */ |
| |
| return libusb_submit_transfer(xfr); |
| } |
| |
| static void measure(void) |
| { |
| struct timeval tv_stop; |
| unsigned long diff_msec; |
| |
| gettimeofday(&tv_stop, NULL); |
| |
| diff_msec = (tv_stop.tv_sec - tv_start.tv_sec) * 1000L; |
| diff_msec += (tv_stop.tv_usec - tv_start.tv_usec) / 1000L; |
| |
| printf("%lu transfers (total %lu bytes) in %lu milliseconds => %lu bytes/sec\n", |
| num_xfer, num_bytes, diff_msec, (num_bytes * 1000L) / diff_msec); |
| } |
| |
| static void sig_hdlr(int signum) |
| { |
| switch (signum) { |
| case SIGINT: |
| measure(); |
| do_exit = 1; |
| break; |
| } |
| } |
| |
| int main(void) |
| { |
| int rc; |
| struct sigaction sigact; |
| |
| sigact.sa_handler = sig_hdlr; |
| sigemptyset(&sigact.sa_mask); |
| sigact.sa_flags = 0; |
| sigaction(SIGINT, &sigact, NULL); |
| |
| rc = libusb_init(NULL); |
| if (rc < 0) { |
| fprintf(stderr, "Error initializing libusb: %s\n", libusb_error_name(rc)); |
| exit(1); |
| } |
| |
| devh = libusb_open_device_with_vid_pid(NULL, 0x16c0, 0x0763); |
| if (!devh) { |
| fprintf(stderr, "Error finding USB device\n"); |
| goto out; |
| } |
| |
| rc = libusb_claim_interface(devh, 2); |
| if (rc < 0) { |
| fprintf(stderr, "Error claiming interface: %s\n", libusb_error_name(rc)); |
| goto out; |
| } |
| |
| benchmark_in(EP_ISO_IN); |
| |
| while (!do_exit) { |
| rc = libusb_handle_events(NULL); |
| if (rc != LIBUSB_SUCCESS) |
| break; |
| } |
| |
| /* Measurement has already been done by the signal handler. */ |
| |
| libusb_release_interface(devh, 0); |
| out: |
| if (devh) |
| libusb_close(devh); |
| libusb_exit(NULL); |
| return rc; |
| } |