--- Alan Stern <[EMAIL PROTECTED]> wrote: > On Thu, 28 Apr 2005, Adam Oldham wrote: > > > > I have a USB device that has 1 configuration and > has > > an interrupt endpoint set up as: > > Endpoint: > > bLength = 7 > > bDescriptorType = 05 > > bEndpointAddress = 83 (in) > > bmAttributes = 03 (Interrupt) > > wMaxPacketSize = 0008 > > bInterval = 01 > > > > I would like to change the bInterval value to ff > to > > change the poll interval. I can sucessfully > change > > the value for the endpoint stored in the usb > device > > structure with no problem. However, I am very > > unsuccessful in getting the updated endpoint back > to > > the device. I thought that maybe > > usb_set_configuration or usb_set_interface my > force > > endpoints up too, but it doesn't. > > > > So, can anyone please give me some tips on what I > > would need to do to get this endpoint updated so > that > > I can change the bInterval value? > > None of the routines in the Linux USB stack will do > this for you. > > In fact the SET_DESCRIPTOR request is optional > according to the USB spec, > and I imagine very few devices support it. So there > is no way you can > change the endpoint descriptor's bInterval value as > stored in the device. >
So in essense, there is no way to change the poll interval for devices outside of getting the vendor to change the software on the device itself? Resubmitting the URB like someone else suggested doesn't have any affect, that I can tell. Adam /************************************************************ * Adam Oldham, Software Engineer, Gilbarco Inc * Greensboro, NC * Big H Performance Rally Team - http://www.bighracing.com *************************************************************/ __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com ------------------------------------------------------- SF.Net email is sponsored by: Tell us your software development plans! Take this survey and enter to win a one-year sub to SourceForge.net Plus IDC's 2005 look-ahead and a copy of this survey Click here to start! http://www.idcswdc.com/cgi-bin/survey?id=105hix _______________________________________________ linux-usb-devel@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
