The USB interface may interfere with the QVGA display on the STM32F429I-DISC1

[balaji_s]

In my program code, I select an STM32F429I-DISC1 example code through the TouchGFX IDE, which runs successfully in STM32F429I-DISC1 dev board. The displays work fine without any issues. However, I need to configure the USB CDC. Since the USB_OTG_FS pins are connected to the display, I enabled USB_OTG_HS with the following settings:

              1.PB14 set to USB_OTG_HS_DM

              2.PB15 set to USB_OTG_HS_DP

              3.Internal FS PHY set to "device only."

              4.USB device class set to "communication device class" for HS IP.

The output is received, but the display screens appear half-filled and continuously blink. The USB pins are not configured for any other operation, so why is there a conflict between the USB and the display?

[waclawek.jan]

Maybe bandwidth exhaustion?

JW

[GaetanGodart]

Hello @balaji_s ,

I have created a a project using the STM32F429I-Dk rev E01.
It worked fine.

Then I went on the IOC and enabled the USB_OTG_HS like you did but I did not find where to set USB device class to "communication device class" for HS IP.
It also worked fine.

I am not sure how to help you since I am unable to replicate the issue.

Have you selected the right TouchGFX Board Setup (TBS)? There is 2 TBS for this board, you have to take the correct one based on your board revision :

Regards,