2010/7/12 Chris Wolf <cw10...@gmail.com>:
> Wander,
>
> I tried some other things:
>
> 1.) I tried to use openusb. There were some issues building on the Mac -
> the distribution tar archive was missing a header file, "darwin.h"
> and the sample program was missing, both of which I got from source
> control. Even after that, the PyUSB wrapper didn't work as expected,
> although it did find and open the shared library.
>
> 2.) Next I tried libusb10, this seemed to work. The PyUSB wrapper can now
> iterate over all the devices/interfaces on my machine.
>
> I noticed that the PyUSB bindings seem to not fully treat the notion of
> busses - even the legacy.busses() function only returns a single dummy
> Bus object, which simply has an array of Devices, regardless of which real
> bus each of those devices belongs to. I suppose this is Ok, since for the
> purpose of interacting with connected peripherals, the particular bus does
> not matter as long as somehow you can fetch the matching device and it's
> cfg, interface, ep, etc.
>
> I guess I was curious about busses so that I could have a program to traverse
> the whole bus/device tree like Apple's hardware profiler. (see attached image)
>
> This last point is not very important, so I don't expect any help from you
> on this - I was just comparing the libusb/PyUSB capability with the Apple
> utility.
>
> The important issue of finding devices/interfaces/config seems to be solved
> by moving away from libusb01 to libusb10.
>
> Thanks for your help,
>
> Chris Wolf
>
> P.S. If you still want to pursue the issues with libusb01 on MacOS, I can work
> with you on it, otherwise I seem to be all set with libusb10.
This would be for great help, it is really weird that PyUSB get_busses
is not working.
>
> On 7/11/10 11:09 AM, Chris Wolf wrote:
>>
>>
>>
>>> What's libusb .so file named?
>>
>> I also looked at this code:
>>
>> class _LibUSB(usb.backend.IBackend):
>> @methodtrace(_logger)
>> def enumerate_devices(self):
>> _check(_lib.usb_find_busses())
>> _check(_lib.usb_find_devices())
>>
>> bus = _lib.usb_get_busses()
>>
>> while bool(bus):
>> dev = bus[0].devices
>> while bool(dev):
>> yield dev[0]
>> dev = dev[0].next
>> bus = bus[0].next
>>
>>
>> ...and so I performed the following test:
>>
>>>>> import usb.backend.libusb01
>>>>> usbe = usb.backend.libusb01.get_backend()
>>>>> libusb = usb.backend.libusb01._lib
>>>>> busses = libusb.usb_get_busses()
>>>>> print bool(busses)
>> False
>>
>> So it looks like it's not getting the bus linked list for some reason,
>> even though the 'C' lib demo code does:
>>
>> int
>> main(int argc, char *argv[]) {
>> struct usb_bus *busses;
>> usb_init();
>> usb_find_busses();
>> usb_find_devices();
>>
>> busses = usb_get_busses();
>>
>> struct usb_bus *bus;
>> int c, i, a;
>>
>> /* ... */
>>
>> for (bus = busses; bus; bus = bus->next) {
>> struct usb_device *dev;
>> printf("BUS: %02.02x: %s\n", bus->location, bus->dirname);
>>
>>
>> Thanks,
>>
>> -Chris
>
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--
Best Regards,
Wander Lairson Costa
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