View Full Version : USB 2.0 Game controllers

07-14-2010, 01:15 PM
Does anyone know if game controllers actually benefit from USB 2.0? I see the term being thrown around a lot like "USB 2.0 compatable" but are devices like joysticks and gamepads REALLY moving that much data that they need 480 MBs transfer rate? The reason I am axing is because I am working on a flightsim controller setup where I many be using 3 or even 4 seperate USB devices. I have a USB 1.1 hub that I can integrate into the design so I will only have to plug 1 USB cable into my PC but I am wondering if the 3 input devices (Analog joystick, gamepad, and keyboard) will see a performance drop or lag. The gamepad is a Dualshock style with force feedback. I just can't see the need for more then 12 MBs and the real issue would probably be if the device polling lower with USB 1.1 as the transfer rate will probably not even come close to being exceeded by 3 input devices. I am reading that the default polling rate is 125Mhz so every 8 milliseconds the device in question is updated. I assume this drops as you add many more devices. i am also reading that it seems you can increase the polling rate with software up to at least 250Mhz. That might be something for everyone to think about. Read this http://www.nextlevelgamer.com/...b-mouse-polling-rate (http://www.nextlevelgamer.com/tweaks/optimizing-your-usb-mouse-polling-rate)

07-14-2010, 01:25 PM
It's more important for USB drives and suchlike, I don't think you really need to worry about it.

07-14-2010, 01:38 PM
Koolz, yeah I figured but just wanted a second opinion to check my though process. I'll post pics of what I'm up to when I get almost done with it. Suffice it to say, it's not THE most elaborate mod and the construction time and cost play into it. I basically wanted to come up with something anyone could do in a short amount of time with minimal $$$ and still have sweet setup.

07-15-2010, 04:21 PM
Just be aware that you will need to use a self-powered hub if you want to plug in joysticks and trackIR etc, as these use more power than just a regular mouse or keyboard and if the hub is not self powered it will be trying to draw all that power from the one port it's plugged into.

07-16-2010, 12:46 AM
It's is probably better to get faster USB devices, and a lot depends on how the developers read info off the device.

1) If they use what is called 'Polling', a Slow device will/could slow up the game.
2) If they use 'Event/Interrupt' type programming methods, it'll make no difference how slow the device is, except for for game that is.