On Sat, 10 Mar 2007, Phil Dibowitz wrote: > So I sat down to start seeing if I could write the aforementioned driver for > the Logitech Harmony remote using libusb. After reading the docs, I whipped > out the following test code (ok, its mostly a copy and paste of the docs, > but that's OK) which binds to the interface and attempts to do an interrupt > transfer to the endpoint. > > But I get: "error submitting URB: Bad address". I've attached the (very > ugly) code below, but I don't think it's a coding error as much as a not > understanding error.
Does that error string come from usb_strerror()? My copy of libusb is rather old and doesn't seem to include that routine. It would help to see the actual error code returned by usb_interrupt_write(). > Looking at lsusb, the device has one Configuration with bConfigurationValue > 1, and one Interface with bInterfaceNumber 0. Then why does your program try to claim interface 1? > Under this interface, it has two endpoints, 0x81, "EP 1 IN", and 0x02, "EP 1 > OUT", Actually that's EP 2 OUT, not that it matters. > which I believe, from looking at USB Snoopy dumps, are IN ==> > device-to-host, and OUT ==> host-to-device. But I've tried my code using > both endpoints, and get the same error each time. > > The USBSnoopy log shows from windows shows a very simple setup: > SELECT_CONFIGURATION, CLASS_INTERFACE, GET_DESCRIPTOR_FROM_INTERFACE, and > then a ton of BULK_OR_INTERRUPT_TRANSFERs. lsusb shows that the devices or > of transfer type Interrupt. > > Since all the software does is write a blob to the remote (which, after > looking, turns out to just be XML), this all seems straight forward. It > doesn't seem like I have to do any special setup... > > The USBSnoopy logs show it writing 64 bytes at a time, so that's what I > write in my code. Your timeout value of 2 ms seems rather low. You might want to increase it. Have you tried setting the usbfs_snoop=1 module parameter for usbcore? It will dump your program's I/O activity to the system log. Alan Stern ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ linux-usb-devel@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
