why the touch point and the displayed position are exactly opposite?

[LLiao.1]

Hello, 

I used the SMT32F429i-DISC1 and TouchGFX follow the user guide

coding, why the touch point and the displayed position are exactly opposite?

For example, if my button is on the far left, I have to press the far right position of panel to respond?

Thanks

[Martin KJELDSEN]

I'm not 100% clear on how you created the project. If you're using the application template from the designer then you shouldn't be having those issues.

Is this a brand new board? There have been cases where touch ics have been replaced on newer models (causing weird behavior).

/Martin

[Romain DIELEMAN]

Hi,

Did you start your project from TouchGFX Designer by using the Application Template for the STM32F429I discovery board? This will generate a project with all the necessary configuration.

By user guide did you mean the online TouchGFX documentation? I believe you might have inverted some position settings within CubeMX at some point.

Could you share your project by any chance ?

/Romain

[LLiao.1]

Hello,

I made it into a video, it might be easier for you to understand

​

https://youtu.be/G6UlKjft8jo

​

https://youtu.be/gFLBeQiGvd8

​

Leo Liao

Thanks ​& Best Regards

[LLiao.1]

Yes, This is a new board , When I got it, its function was correct, after I download the demo code from web it started work abnormal. I am guessing it may be a problem with Touch IC. but I don't know what touch chips it used. 

[LLiao.1]

Hello,

I tried to modify the BSP_TS_GetState() for Touch calibration, it seems works normal, but I am not sure is it make sense.

Thanks & Best Regards

Leo Liao

[Martin KJELDSEN]

​That does look weird, and especially because the issue is also there using the ST out-of-the-box demo for the disc1.

I will see if we have a very new 429-disc1 board at the office

/Martin

[OHenr.1]

Hello, I got the exact same issue with a new 429-disc1 board. Touch was working correct when the board arrived. After upload from TouchGFXdesigner the screen touch was verticaly mirrored. Example, when a button was at the top of the display I had to press at the bottom to selct this button. It shows also the same behavior when I upload the binary file form STM.com page with the original program.

Is there any solution? How to calibrate the touch positions at program start?

Oliver

[OHenr.1]

To LLiao,

hello, how did you modify the BSP_TS_GetState() ?

Did it finaly solve your problem?

regards Oliver

[OHenr.1]

Hello,

I investigated quite deep into this issue and my case is still open at ST.

For now I also modified the code in BSP_TS_GetState.

Modification y = 320 - y;

I subtract the y coordinate from pixelheight to invert y.

Now it works...

/Oliver

[Martin KJELDSEN]

Which application template are you using from TouchGFX Designer?