F429 TouchGFX not working on own PCB
- October 27, 2020
- 1 reply
- 1299 views
Hi! I have a program with TOUCHGFX running on F429-DISC1. It works fine and display correctly both on the disc1 original touch screen and an external screen with RGB666 interface i connected to the header.
As it look alright on the DISC1 board, i move forward to fabricate my own PCB. But then the same software that display normally on disc1 could never display correctly on my own PCB. At first i though it was the SDRAM problem because i wasn't using the same model, so i change it to the exact model as the DISC1 and it still the same problem.
I tried to recreate the problem on the DISC1 and found that if i comment out the BSD Init Sequence of SDRAM, the same INCORRECT content will be displayed.
The PCB i made had 6mil width track and the length of 500 - 2000mil for all SDRAM connection.
Now, i am not sure what my next step should be. Length Matching?
I followed this official sch .
https://www.st.com/resource/en/schematic_pack/mb1075-f429i-e01_schematic.pdf
Thank you very much!!!