Display with dual serial input

Display with Dual Serial input

To follow the communication in a system (Wifi, Lora radio etc.) on both send and receive side
in real time, I built this one. It has two independent STM32F103 microcontrollers and two ST7789
TFT-s built together, one for each serial channel. The user can adjust baud rate, font size, scroll
in a selected STM32.
Each side can display 300 or 1200 characters from a 8192 byte buffer. If new characters are received,
the display will be refreshed.

The 3D printed parts are made for the 1.3" IPS display with 12 pin FPC connector, two of these are mounted
tight to each other. The same 3D part holds two STM32 microcontrollers on the back side. I have used
STM32 chips soldered on 48 pin adapter PCB, this is much compacter than the Blue Pill. For a minimal
system only a crystal,a few capacitors, resistors are necessary. I use a fine tip soldering iron at 310C
to solder the chip (0.5mm between pins) on the adapter PCB as well as soldering 0.25mm enam