As an introduction to learning, 5 1 is indeed the most basic, but at least it can make a novice understand what is control and feedback, how to download and run programs, how to control io input and output, how to access registers, and master a set of basic development methods and learning ideas in embedded understanding. If you are interested in this part, it is suggested that the study time should not exceed two months.

1.c language and some assembly codes.

2. I studied in Guo Tianxiang for ten days and learned 5 1 MCU in one month.

Buy a development board

4. Learn to read and understand the schematic diagram.

5. Master the ability to collect data, find and read English manuals on data sheets.

6. Do a simple function yourself.

Finally, I don't actually recommend 5 1 entry, but you can go directly to stm32, although he is still a single chip microcomputer. But ten years ago, I started with 5 1, and I enjoyed it. As for the protocol and kernel I lied to you about, I think there is no doubt that a freshman embedded novice wants to build a high-rise building without foundation, so start from the foundation. Universities pay attention to foundation and learning ability!