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#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <stdio.h>
#include <errno.h>
#include <signal.h>
#include <libusb-1.0/libusb.h>
#define EP_DATA_IN 0x82
static struct libusb_device_handle *devh = NULL;
static unsigned int num_bytes = 0, num_xfer = 0;
static struct timeval tv_start;
static void cb_xfr(struct libusb_transfer *xfr)
{
if (xfr->status != LIBUSB_TRANSFER_COMPLETED) {
fprintf(stderr, "transfer status %d\n", xfr->status);
libusb_free_transfer(xfr);
exit(3);
}
//printf("length:%u, actual_length:%u\n", xfr->length, xfr->actual_length);
num_bytes += xfr->length;
num_xfer++;
if (libusb_submit_transfer(xfr) < 0) {
fprintf(stderr, "error re-submitting URB\n");
exit(1);
}
}
static int benchmark_in(void)
{
static uint8_t buf[2048];
static struct libusb_transfer *xfr;
xfr = libusb_alloc_transfer(0);
if (!xfr)
return -ENOMEM;
libusb_fill_bulk_transfer(xfr, devh, EP_DATA_IN, buf,
sizeof(buf), cb_xfr, NULL, 0);
gettimeofday(&tv_start, NULL);
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("%u transfers (total %u bytes) in %u miliseconds => %u 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();
exit(0);
break;
}
}
int main(int argc, char **argv)
{
int rc;
signal(SIGINT, &sig_hdlr);
rc = libusb_init(NULL);
if (rc < 0) {
fprintf(stderr, "Error initializing libusb\n");
exit(1);
}
devh = libusb_open_device_with_vid_pid(NULL, 0x16c0, 0x0763);
if (!devh) {
fprintf(stderr, "Error finding USB device\n");
exit(1);
}
rc = libusb_claim_interface(devh, 0);
if (rc < 0) {
fprintf(stderr, "Error claiming interface\n");
exit(1);
}
benchmark_in();
while (1) {
libusb_handle_events(NULL);
}
}
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