PS3 controller multiple axis with same usage reports wrong value

[sonik-br]

Hi.
I'm interfacing with a game controller and it have two "Slider" axis.
The report is correct on windows (joy.cpl)
In the HID Demo one of the sliders report is duplicate on the other. The second one don't generate any report.

The descriptor: (I added the "DataIndex" property on the list).

And the event log.

Here it's possible to see that the Sliders both are sharing the same values.

I try to debug but could not find the problem. Looks like it ignores the DataIndex if the axis is duplicate?

If you can at least point me in the right direction so I can try to fix.

Thanks.

[Slion]

Been a while since I had a look at that code but if I had to take a guess it probably does a look-up for the Slider and take the first one it finds, not expecting you can have multiple of them. It could be tricky to fix too. Can you not reassign one of the Sliders to another axis somehow? Do you mind me asking what kind of device is that?

[sonik-br]

I'm interfacing with some gamepads and gamepad adapters.
This one is not an adapter, but an Playstation 3 controller directly connected to windows using the driver provided by Sony (maker of the device).
It's not really required to fix for this device but would be good to have it working for others.
I understand if it's something hard to track down and not worth to fix.

[Slion]

I'm just now starting to understand that issue. I don't have a PS3 controller but I do have a PS4 controller so I guess I'll try to reproduce it with that one. Thanks again for taking the time to report it.

The thing is I don't think I'm myself using that DataIndex to fetch the values. It's done in HidEvent.GetUsageValues using HidP_GetUsageValue. I wonder if that could be a Windows bug. Need to take a closer look though.

I can't reproduce the issue with the PS4 controller cause it does not have multiple axis with the same usage…

[Slion]

I have the means to test that here apparently by configuring my Virpil joystick. However when I try to configure it with multiple axes having the same name it gives out a warning message:

Just saying it looks like this is something to be avoided in general.

[Slion]

It does work in the control panel, it's showing two sliders, both are working nicely.

[Slion]

And I can reproduce the issue in HID Demo. I'll try to debug that later today.

[Slion]

The issue it seems is indeed due to HidP_GetUsageValue. It looks like they even describe the problem in the docs remarks section.

Basically to support that we should use HidP_GetUsageValueArray instead off HidP_GetUsageValue.

[Slion]

We should switch to Microsoft.Windows.CsWin32 to gain access to HidP_GetUsageValueArray

[Slion]

Except that our ReportCount is not above one so that array function might not be what we need here. I'm still missing a piece of the puzzle.

I'm guessing I still need to experiment with HidP_GetUsageValueArray to see if I can get it to work somehow.

[sonik-br]

Nice! Thanks for taking a shot at it.

The PS3 controller have some unique features... It's buttons are "pressure sensitive"!
So the driver them as button bits and also as sliders. That's why it does have a bunch of sliders.

[Slion]

As feared using HidP_GetUsageValueArray does not work it returns HIDP_STATUS_NOT_VALUE_ARRAY. More investigation is needed to work that one out. I'll put on the ice for now however.