VFD clock based on STM32G0

Features:
High-precision clock chip,
Type-C external power supply,
VFD display module. Stylish colors.
Regarding the VFD display module:
The VFD uses a driver-equipped module [8-bit standard module], link:
[Taobao] https://m.tb.cn/h.gRSBszRKSWjYMjH?tk=ynoH3c7G65H HU9196 "Arduino C51 STM32 VFD display module 8-bit dot matrix display module VFD fluorescent screen serial port"
Click the link to open directly or search on Taobao.
　The advantage of using the module is that you don't need to write your own VFD driver; SPI can be used.
Power-off timekeeping
uses a CR2032 button battery to power the clock chip, ensuring normal timekeeping even after power loss.
Board connections
use dual-channel M210 copper pillars and PM24MM screws connected through mounting holes. The main controller and module are connected using pin headers and sockets. The height of the pin headers and sockets is slightly higher than the copper pillars, but the impact is not significant; if you mind, handle it yourself. There was
a hardware bug
: the I/O panel didn't show pull-up resistors. I'm not sure if the built-in pull-up resistors on the STM32G0's I/O pins are even useful, so I added two jumper wires. (This was a project I did a long time ago, and I haven't looked into it in detail.)