Hi!
After updated libusb from 1.0.11 to 1.0.17 in my Debian Wheezy, I have got
the same problem as described in next thread:
http://developer.intra2net.com/mailarchive/html/libftdi/2011/msg00609.html
A sample program:
#include <stdio.h>
#include <stdlib.h>
#include <ftdi.hpp>
int main(void)
{
Ftdi::Context *ftdic = new Ftdi::Context;
int ret = ftdic->open(0x0403, 0x6001);
if (ret < 0) {
fprintf(stderr, "open error %d\n", ret);
}
delete ftdic;
return EXIT_SUCCESS;
}
ftdic->open() returns -5
I suppose that this is because there is call get_strings_and_reopen() which
calls ftdi_usb_get_strings() which calls libusb_open() for already opened
device. A solution may be to call ftdi_usb_close_internal() from
ftdi_usb_get_strings() function before reopen it or to check if it is
already opened and don't open twice. I tried both but prefer second and
simple do like this:
--- libftdi1-1.1/src/ftdi.c.orig 2014-02-05 22:24:11.000000000 +0600
+++ libftdi1-1.1/src/ftdi.c 2014-05-15 14:42:13.534444380 +0600
@@ -413,8 +413,9 @@
if ((ftdi==NULL) || (dev==NULL))
return -1;
- if (libusb_open(dev, &ftdi->usb_dev) < 0)
- ftdi_error_return(-4, "libusb_open() failed");
+ if (ftdi->usb_dev == NULL)
+ if (libusb_open(dev, &ftdi->usb_dev) < 0)
+ ftdi_error_return(-4, "libusb_open() failed");
if (libusb_get_device_descriptor(dev, &desc) < 0)
ftdi_error_return(-11, "libusb_get_device_descriptor() failed");
--
wbr
Denis Sirotkin
--
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