GT911 stucks/freezes in multitouch.

[KAgga.1]

Hello Community,

I'm using GT911 with STM32F746 over I2C. I have noticed some time it stucks when multi touch is used (very few times in single touch as well). Upon debugging I noticed a change of voltage level of Interrupt pin.

In working state, INT pin stays High ideally but after the touch freezes, it stays Low with spikes.

Please find the attached screenshot of waveforms.

1. INT pin when GT911 stucks
2. INT pin when GT911 works fine

Also Find the attached GT911 code.

Regards,

Keshav Aggarwal

[TechE]

Hi,

 

I am facing a similar issue with my board using the GT911 touch IC. What did you do to solve this issue?

Thanks.

[snnzdmr1]

- You should use pullup resistors

- Activate 5 point touch in gt911 settings