Why would a joystick be a "low-speed" USB device vs a gamepad? \ VOGONS

Why would a joystick be a "low-speed" USB device vs a gamepad?

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First post, by DracoNihil

Posted on 2015-07-23, 20:49

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1[ 1595.501289] usb 5-2: new full-speed USB device number 4 using ohci-pci
2[ 1595.676424] usb 5-2: New USB device found, idVendor=046d, idProduct=c21d
3[ 1595.676428] usb 5-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
4[ 1595.676431] usb 5-2: Product: Gamepad F310
5[ 1595.676432] usb 5-2: Manufacturer: Logitech
6[ 1595.676434] usb 5-2: SerialNumber: C988AC53
7[ 1595.678535] input: Generic X-Box pad as /devices/pci0000:00/0000:00:13.0/usb5/5-2/5-2:1.0/input/input16
8[ 1604.052226] usb 5-3: new low-speed USB device number 5 using ohci-pci
9[ 1604.240906] usb 5-3: New USB device found, idVendor=046d, idProduct=c215
10[ 1604.240911] usb 5-3: New USB device strings: Mfr=1, Product=2, SerialNumber=0
11[ 1604.240913] usb 5-3: Product: Logitech Extreme 3D
12[ 1604.240915] usb 5-3: Manufacturer: Logitech
13[ 1604.271172] input: Logitech Logitech Extreme 3D as /devices/pci0000:00/0000:00:13.0/usb5/5-3/5-3:1.0/input/input17
14[ 1604.271303] logitech 0003:046D:C215.0004: input,hidraw0: USB HID v1.10 Joystick [Logitech Logitech Extreme 3D] on usb-0000:00:13.0-3/input0

Am I missing something here or, are gamepad's so serious they need to be high bandwidth devices? I would of figured a full range joystick with twist and throttle control would need more bandwidth.

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Reply 1 of 8, by Snayperskaya

Posted on 2015-07-23, 22:08

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Maybe it have something to do with it being a XInput device?

Reply 2 of 8, by SquallStrife

Posted on 2015-07-23, 23:46

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The USB chip doesn't know what the device's true bandwidth requirements are. When the kernel USB driver reports high or low speed, it's just telling you how the USB device has identified itself.

So all this means is that the game pad manufacturer specified "I am a high speed device" in the firmware, not that actually needs 11-480Mbps of bandwidth to operate.

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Reply 3 of 8, by DracoNihil

Posted on 2015-07-24, 03:43

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Ah okay, thanks for clearing that up Squall.

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Reply 4 of 8, by dr_st

Posted on 2015-07-25, 17:39

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Well, the F310 has, in addition to the gamepad, 2 analog sticks, and two analog triggers. Altogether it's probably not less complex than the Extreme 3D.

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Reply 5 of 8, by Davros

Posted on 2015-07-25, 20:00

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joystick is usb 1.0, gamepad is usb 2.0

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Reply 6 of 8, by smeezekitty

Posted on 2015-07-25, 20:55

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Even USB 1.0 is much faster than a human on a joystick. People are rather slow

Reply 7 of 8, by DracoNihil

Posted on 2015-07-25, 21:57

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Has anyone got the Logitech Extreme 3D to work on, say... a Windows 9x machine? Since it's USB 1.0

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Reply 8 of 8, by Matth79

Posted on 2015-07-26, 22:35

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Full speed is not "super fast".

USB1 defined "low speed" 1.5Mb/s and "full speed" 12Mb/s
USB2 added "high speed" 480Mb/s - not sure if there is any difference at all between a device claiming to be USB 2 full speed and one that is USB1

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