I had hoped that I could make some progress by investigating this further myself, but wasn't able to figure much out... It seems to me in the log file that I posted, the log entry of most interest is this one: libusbx: debug [darwin_handle_callback] handling isoc completion with kernel status -536854513 That message is shown for most [darwin_handle_callback] entries, alternating sometimes with: libusbx: debug [darwin_handle_callback] handling isoc completion with kernel status 0
-536854513 presumably means kIOUSBNotSent2Err. Perhaps a helpful discussion about this error can be found in this thread: http://lists.apple.com/archives/usb/2007/Apr/msg00003.html But it's too technical for my current knowledge of mac and USB. In particular, maybe this comment is relevant? "if you take a look at AppleUSBOHCI.cpp, you'll find that kIOUSBNotSent2Err corresponds to OHCI status 15. You can look that up in the OHCI spec. A not sent error occurs because your request is never put onto the bus. This usually happens if the request is for a frame number in the past, or too far in the future. I think that all your requests are for a time in the past, so they never get put onto the bus by the controller." http://lists.apple.com/archives/usb/2007/Apr/msg00008.html Anyone have any suggestions? Here is the output from lsusb -vvv for my device which isn't working on mac (but, as described previously, works fine on linux): Bus 002 Device 006: ID 088d:0006 Device Descriptor: bLength 18 bDescriptorType 1 bcdUSB 2.00 bDeviceClass 0 (Defined at Interface level) bDeviceSubClass 0 bDeviceProtocol 0 bMaxPacketSize0 64 idVendor 0x088d idProduct 0x0006 bcdDevice 0.02 iManufacturer 1 Syntech NL iProduct 2 IDAC 4 iSerial 0 bNumConfigurations 1 Configuration Descriptor: bLength 9 bDescriptorType 2 wTotalLength 39 bNumInterfaces 1 bConfigurationValue 1 iConfiguration 0 bmAttributes 0x80 (Bus Powered) MaxPower 32mA Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 0 bAlternateSetting 0 bNumEndpoints 3 bInterfaceClass 0 (Defined at Interface level) bInterfaceSubClass 0 bInterfaceProtocol 0 iInterface 0 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x01 EP 1 OUT bmAttributes 2 Transfer Type Bulk Synch Type None Usage Type Data wMaxPacketSize 0x0040 1x 64 bytes bInterval 0 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x82 EP 2 IN bmAttributes 1 Transfer Type Isochronous Synch Type None Usage Type Data wMaxPacketSize 0x0258 1x 600 bytes bInterval 1 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x06 EP 6 OUT bmAttributes 1 Transfer Type Isochronous Synch Type None Usage Type Data wMaxPacketSize 0x0005 1x 5 bytes bInterval 1 On Mon, Jun 18, 2012 at 12:20 PM, Xiaofan Chen <xiaof...@gmail.com> wrote: > On Sun, Jun 17, 2012 at 10:33 PM, Ellis Whitehead > <ellis.whiteh...@gmail.com> wrote: >>>> You can produce detailed debug log if you set the environmental >>>> variable LIBUSB_DEBUG to 4. That debug log may help to identify >>>> the potential problem. >> >> Ok, I've uploaded it here: >> http://gcead.sourceforge.net/libusbx-debug-20120617.log >> I issued the command to start recording at timestamp [12.054910]. Due >> to the large number of debug lines, I stopped recording at >> [12.528804]. Shutdown was at [18.014753]. >> > > Indeed this looks like a potential problem in the Mac OS X backend. > > What is the Mac OS X version you are using? Could you post > the details about your device (eg: USB Prober output about > your device, or "lsusb -vvv" under Linux or the USBView > output under Windows)? > > I do not know much about the details of the OS X backend but hopefully > others can help you here. > > > -- > Xiaofan > > ------------------------------------------------------------------------------ > Live Security Virtual Conference > Exclusive live event will cover all the ways today's security and > threat landscape has changed and how IT managers can respond. Discussions > will include endpoint security, mobile security and the latest in malware > threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ > _______________________________________________ > libusbx-devel mailing list > libusbx-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/libusbx-devel ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ libusbx-devel mailing list libusbx-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/libusbx-devel
