FFB values in report seems to be incorrect

nj
Guest

FFB values in report seems to be incorrect Jan 9, 2020 23:24:02 GMT

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Post by nj on Jan 9, 2020 23:24:02 GMT

Hello Shaun,

I am trying to use vJoy to receive FFB values from either a test program or from a third party tool.
I tried both vJoy 2.1.8 and 2.1.9.1 versions with their respective C++ SDK example of vJoy, but got same behavior.

When using a FFB effect generator like github.com/erik-smit/FFBInspector, I receive correctly the FFB command and effect type, but internal data seems to be always corrupted, giving absurd values.
For exemple, playing a constant force effect with gain 10000 in FFBInspector and dumping the FFB values using vJoy SDK sample give a data field with the same value repeating : 6FBC48 6FBC48
... whatever effect/values is given.
Seems like a bug somewhere, but where ?
Regards

============= FFB Packet size Size 10 =============

> Device ID: 1

> Packet Type: Device Gain Report

>> Global Device Gain: 100

FFB Size 10

Cmd:000B000F ID:1D Size:02 - 6FBC48 6FBC48

====================================================

============= FFB Packet size Size 12 =============

> Device ID: 1

> Packet Type: Create New Effect Report

>> Effect Type: Constant Force

FFB Size 12

Cmd:000B0191 ID:11 Size:04 - 6FBC48 6FBC48 6FBC48 6FBC48

====================================================

============= FFB Packet size Size 12 =============

> Device ID: 1

> Packet Type: Constant Force Report

> Effect Block Index: 1

FFB Size 12

Cmd:000B000F ID:15 Size:04 - 6FBC48 6FBC48 6FBC48 6FBC48

====================================================

============= FFB Packet size Size 26 =============

> Device ID: 1

> Packet Type: Effect Report

> Effect Block Index: 1

>> Effect Report: Constant Force

>> Direction: 88 deg (3f)

>> Duration: Infinit

>> Trigger Repeat: 0

>> Sample Period: 0

>> Gain: 100%

FFB Size 26

Cmd:000B000F ID:11 Size:18 - 6FBC48 6FBC48 6FBC48 6FBC48 6FBC48 6FBC48 6FBC48 6FBC48 6FBC48 6FBC48 6FBC48 6FBC48 6FBC48 6FBC48 6FBC48 6FBC48 6FBC48 6FBC48

====================================================

nj
Guest

FFB values in report seems to be incorrect Jan 10, 2020 12:22:12 GMT

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Post by nj on Jan 10, 2020 12:22:12 GMT

Ok, I found the issue. It is in the sample of the SDK.
The function void CALLBACK FfbFunction(PVOID data) prints the values without referencing the correct byte:
for (UINT i = 0; i < FfbData->size - 8; i++)
_tprintf(" %02.2X", (UINT)FfbData->data);

This should be FfbData->data instead.

I fixed that and also migrated the solution/project to VS2019. I also updated the vJoyInterface dlls to match driver version 2.1.9. Please see github.com/njz3/vJoy
Regards

nj Guest	FFB values in report seems to be incorrect Jan 10, 2020 12:24:19 GMT Quote Select Post Deselect Post Link to Post Back to Top Post by nj on Jan 10, 2020 12:24:19 GMT Wrong formatting of my previous post. This should be`FfbData->data[i]` instead.

marco999
New Member

Posts: 5

FFB values in report seems to be incorrect Jan 10, 2020 17:32:16 GMT

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Post by marco999 on Jan 10, 2020 17:32:16 GMT

Hi nj,

For my experience in the last version 2.1.9.1 the FFB was never work.

I have writed a post some mounts ago:

vjoy.freeforums.net/thread/138/force-feedback-work-first-time

To test it I use both: 'FFB Inspectior' and 'FS force'.

I'm interested to test your fix.

Can you please build your project and upload it to your repositiry ?

nj
Guest

FFB values in report seems to be incorrect Mar 1, 2020 20:02:25 GMT

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Post by nj on Mar 1, 2020 20:02:25 GMT

Jan 10, 2020 17:32:16 GMT marco999 said:

Hi marco,

The FFB works all the time in my case, but only for one effect at a time.

It seems like vJoy driver does not permits to use simultaneous effects, which explains that some games do not run correctly with vJoy.

I discovered that by playing with fedit.exe and setting it to send multiple effects : spring, damper, sine.

In the case of vJoy, the blockindex is always 1, which means one effects override the previous one.

Sadly, some games start an initial effect with infinite duration, like for exemple a spring effect, then they add small effects with limited duration, like constant torque or sine (rumble). In the case of vJoy, this small effect simply replace the spring effect, which means that the feedback is not good.

I bet the issue is within the driver sie. I tried to recompile the driver side of vJoy but without success.

FFB values in report seems to be incorrect

Post by nj on Jan 9, 2020 23:24:02 GMT

Post by nj on Jan 10, 2020 12:22:12 GMT

Post by nj on Jan 10, 2020 12:24:19 GMT

Post by marco999 on Jan 10, 2020 17:32:16 GMT

Post by nj on Mar 1, 2020 20:02:25 GMT

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