STM32F103ZET6 core board compatible with Zhengdian Atom Elite Edition V2

1. Double-layer board design:
1) To save costs, the board size is strictly limited to 10*10cm, with a double-layer board design and reasonable layout.
2) Most of the modules from the Zhengdian Atomic Elite Edition V2 are retained, ensuring good compatibility. (Polypotentiometers, capacitive touch buttons, and ATK modules are placed on my designed baseboard.)
2. Modifications:
1) The pin headers used for switching between boot0 and boot1 have been replaced with toggle switches for easier switching.
2) The potentiometers, capacitive touch buttons, and ATK modules have been removed and placed on my designed baseboard.
3) The CH340C has been replaced with the smaller CH340K package.
3. Shortcomings:
1) A few wires in the JATG interface were overlooked, requiring the use of SWD mode. (Fixed)
2) Differential routing was not used in the high-speed circuit section; the wires were too dense and difficult to route. I'm not very experienced, but so far there haven't been any major problems. (Trace lengths have been maximized.)
Acknowledgements:
This project referenced the schematics and packages of the STM32F103ZET6 development board core board - JLCPCB EDA open-source hardware platform (oshwhub.com), as well as the open-source materials provided by Zhengdian Atom. Special thanks to them.
This is the second version of the project, fixing JTAG interface issues.
For any questions or suggestions, please contact me via email: hhss30804981@163.com.
Thank you.