+++ /dev/null
-/*
- * 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 %u status %d\n", i, pack->status);
- exit(5);
- }
-
- printf("pack%u 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 int diff_msec;
-
- gettimeofday(&tv_stop, NULL);
-
- diff_msec = (tv_stop.tv_sec - tv_start.tv_sec)*1000;
- diff_msec += (tv_stop.tv_usec - tv_start.tv_usec)/1000;
-
- printf("%lu transfers (total %lu bytes) in %u miliseconds => %lu bytes/sec\n",
- num_xfer, num_bytes, diff_msec, (num_bytes*1000)/diff_msec);
-}
-
-static void sig_hdlr(int signum)
-{
- switch (signum) {
- case SIGINT:
- measure();
- do_exit = 1;
- break;
- }
-}
-
-int main(int argc, char **argv)
-{
- 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;
-}
projects / rtmpclient.git / blobdiff