T: Bus=01 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#= 1 Spd=12 MxCh= 2
B: Alloc= 0/900 us ( 0%), #Int= 0, #Iso= 0
D: Ver= 1.00 Cls=09(hub ) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1
P: Vendor=0000 ProdID=0000 Rev= 0.00
S: Product=USB UHCI Root Hub
S: SerialNumber=a000
C:* #Ifs= 1 Cfg#= 1 Atr=40 MxPwr= 0mA
I: If#= 0 Alt= 0 #EPs= 1 Cls=09(hub ) Sub=00 Prot=00 Driver=hub
E: Ad=81(I) Atr=03(Int.) MxPS= 8 Ivl=255ms
=====================================================
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
=====================================================
T: Bus=01 Lev=01 Prnt=01 Port=01 Cnt=02 Dev#= 6 Spd=1.5 MxCh= 0
D: Ver= 1.10 Cls=00(>ifc ) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1
P: Vendor=049f ProdID=0004 Rev= 2.00
S: Manufacturer=SILITEK
S: Product=USB Keyboard
C:* #Ifs= 2 Cfg#= 1 Atr=a0 MxPwr= 50mA
I: If#= 0 Alt= 0 #EPs= 1 Cls=03(HID ) Sub=01 Prot=01 Driver=hid
E: Ad=81(I) Atr=03(Int.) MxPS= 8 Ivl= 24ms
I: If#= 1 Alt= 0 #EPs= 1 Cls=03(HID ) Sub=00 Prot=00 Driver=hid
E: Ad=82(I) Atr=03(Int.) MxPS= 6 Ivl= 24ms
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
