Simple Digital Oscilloscope

This is a simple oscilloscope practice project from the LCSC training camp.
 
This project has a few issues and is for reference only. Please do not use it directly.
 
The core board is from https://oshwhub.com/micespring/stm32h750vb-CoreBoard_copy. It uses a few components that you may have on hand. Please refer directly to the original project for more information.
 
This extended version is based on the Hardwood Classroom oscilloscope expansion board (https://oshwhub.com/damihuang/AFE03).
 
The screen uses an ili9341 screen module. Modifying the initialization code in the example program allows it to light up.
 
It has been prototyped and soldered for verification. A few issues exist, listed below for reference only
: 1. The screen uses an SPI3, but the PB3 pin does not light up. It lights up when connected via a jumper wire from PC10. Due to limited resources, the cause is unknown
. 2. One less 5V LDO was used compared to the standard range, resulting in slight interference.
3. During self-testing, the errors for square waves, triangle waves, and sine waves are relatively large. It's unclear whether this is due to improper soldering or interference from the above reasons. Further investigation is needed (the cause has been found).
 
I plan to release this project today. Before releasing, I wanted to check for any problems, and then I noticed that the Schmitt trigger was strange. A simulation confirmed it was incorrect; it was drawn backwards.