On 8/6/07, Islam Beltagy <[EMAIL PROTECTED]> wrote: > Support asynchronous control submission: Don't know how to do it. Can you > please explain a little bit more about how to implement the Proxy Thread or > you can help me and implement it :$
This should be relatively easy. In the common implementation there are interfaces for UsbPipe and UsbDevice lower-level implementations and "default" implementations of them (specifically, "DefaultUsbDeviceOsImp" and "DefaultUsbPipeOsImp", and "DefaultUsbControlPipeOsImp" as a control-pipe-special case in the com.ibm.jusb.os package). Each one provides "simple" implementations for the submit methods which all use asyncSubmit() as the only method that the os-specific imp needs to provide. This greatly simplifies the code in all platform-specific implementations, as they don't have to worry about sync submissions or byte[] vs. UsbIrp submissions. However it seems libusb only provides a sync function (weird...) so I think the best thing would be to put the change in the common implementation, to allow the platform imp to choose to implement either asyncSubmit or syncSubmit (instead of the current model, requiring asyncSubmit to be used). As far as the specifics on how to implement it, I think the default imp class should have a single Thread that just acts as a proxy, buffering UsbIrps coming in and submitting them one-by-one. Should be very easy. If you want to modify the common imp and send the change to me feel free, otherwise I will try to code it up in the next couple days and check it into CVS. > Support short packets: Don't know how to do it. If any one want to help, > all the code of IO submission is in the file transfer.c in the source code > of Libusb. I posted a request in Libusb mailing list to implement short > packets and I am waiting for reply This will be impossible to do correctly if libusb doesn't provide an interface to it. The short packet functionality is (supposed to be) handled at the USB Host Controller hardware level. However there is already code in the common implementation is to "fake" short packets, for just this case, of OSes that don't provide the functionality. So you don't have to worry about short packets at all. There is a parameter you have to set in the javax.usb.properties file that you provide, see the common implementation's example properties file: http://javax-usb.cvs.sourceforge.net/javax-usb/javax-usb-ri/docs/javax.usb.properties?revision=1.2&view=markup > > Thanks > > Bye > > > > > On 8/2/07, Dan Streetman <[EMAIL PROTECTED] > wrote: > > Ah, ok. I had forgotten about that code, it's been (or seems like) so > > long ago. Hopefully it will be easy to do the steps you listed to > > that existing implementation. Let me know how it goes! > > > > thanks. > > > > On 8/2/07, Islam Beltagy < [EMAIL PROTECTED] > wrote: > > > > /*************************************************************/ > > > Get use of already implemented asynchronous IO > > > What is this? > > > Get use of already implemented Isochronous pipe. > > > What is this? > > > > /*************************************************************/ > > > ok, what I mean is that the current implementation of Javax.Usb based on > > > Libusb does not support asynchronous IO and Isochronous transfer, > despite > > > they are both implemented in Libusb > > > > > > > > > > ------------------------------------------------------------------------- > > > This SF.net email is sponsored by: Splunk Inc. > > > Still grepping through log files to find problems? Stop. > > > Now Search log events and configuration files using AJAX and a browser. > > > Download your FREE copy of Splunk now >> http://get.splunk.com/ > > > _______________________________________________ > > > javax-usb-devel mailing list > > > javax-usb-devel@lists.sourceforge.net > > > > https://lists.sourceforge.net/lists/listinfo/javax-usb-devel > > > > > > > > > > ------------------------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/ _______________________________________________ javax-usb-devel mailing list javax-usb-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/javax-usb-devel
