一般下载的keil中不带stm32芯片，新建工程的时候没有stm32选项，自动更新 太慢且没必要的东西太多。从官网更新找不到对应资源。找了很久的资源，从这里手动下载，直接运行自动导入，新建项目时，下拉框选择调用附加库即可(In general, downloaded keil does not have STM32 chip, new projects do not have the option of stm32, automatic updates are too slow and there are too many unnecessary things. No corresponding resources were found from the official website update. For a long time, you can download the resources manually from here, run the automatic import directly. When you create a new project, the drop-down box chooses to call the additional library.)