On Tue, 22 Oct 2002, Reid Thompson wrote: | contents of /proc/bus/usb/devices. The device of interest is the Topaz | HID Tablet ( between the double lines) | ... | ===================================================== | T: Bus=01 Lev=01 Prnt=01 Port=00 Cnt=01 Dev#= 7 Spd=1.5 MxCh= 0 | D: Ver= 1.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1 | P: Vendor=06a8 ProdID=0043 Rev= 1.01 | S: Manufacturer=Topaz | S: Product=Topaz HID Tablet | C:* #Ifs= 1 Cfg#= 1 Atr=80 MxPwr=100mA | I: If#= 0 Alt= 0 #EPs= 2 Cls=03(HID ) Sub=00 Prot=00 Driver=hid | E: Ad=81(I) Atr=03(Int.) MxPS= 8 Ivl= 1ms | E: Ad=02(O) Atr=03(Int.) MxPS= 8 Ivl= 1ms | ===================================================== ...
The device's endpoints use 1 ms intervals. You didn't say which host controller driver you are using... Also what kernel version is it? I don't know much about evdev/hiddev. Does anyone know if they have their own device/endpoint polling intervals? ~Randy | Randy.Dunlap wrote: | | >On Tue, 22 Oct 2002, Reid Thompson wrote: | > | >| Is there a means to alter the read frequency for hiddev/evdev devices? | >| I have an HID device that outputs at 1ms intervals and, after some | >| research, it appears that evdev & maybe hiddev are read at 2ms | >| intervals???? I am getting what appears to be bad data from the hiddev | >| device -- could it be that my device is overwriting data before it is | >| being read due to this discrepancy in timing? The device works fine as | >| a HID device on windows. | >| _______________________________________________ | > | >The read frequency comes from the device endpoint's "interval" | >parameter. Is that value set to 1 ms? The value is listed | >for each endpoint in /proc/bus/usb/devices. | >You could post the contents of that file when your device is | >attached. | > | >You can always modify the Linux source code so that it uses | >a different interval for a specific device if that's what | >you need to do. Of course, that only helps in your location, | >not other people who are using that device with Linux. | > | >Also, which host controller driver are you using? | >I haven't kept up with them very closely, but I guess there could | >be some issue with one of them not supporting 1 ms intervals... | >That wouldn't be good. ------------------------------------------------------- This sf.net emial is sponsored by: Influence the future of Java(TM) technology. Join the Java Community Process(SM) (JCP(SM)) program now. http://ad.doubleclick.net/clk;4699841;7576301;v?http://www.sun.com/javavote _______________________________________________ [EMAIL PROTECTED] To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-users
