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Today I will share two points:
1. A code formatting plugin [AStyle] — recommended by a friend who follows me!
2. STM32 Clock and Precautions;
1AStyle Plugin
A few days ago, a friend who follows me (*inbun Yi*) recommended this AStyle plugin. I checked it out and thought it was quite good. So, I downloaded it and added it to MDK-ARM for a trial, and it works well. Therefore, I also recommend it to everyone.
A code formatting plugin, as the name suggests, formats the code, which simply means it’s a plugin for code layout. For example: code indentation.
Plugin download link:
http://astyle.sourceforge.net/
I won’t go into detail about the installation process; you can refer to:
https://zhuanlan.zhihu.com/p/23012907
(Note: The official account does not support external links; please copy the link to your browser to download.)
I recorded a simple animation of adding the plugin:
Of course, everyone has different preferences for editors, so I won’t make recommendations. Personally, I usually use popular software like Source Insight and VS Code, but just choose what you like.
2STM32 Clock and Precautions
I often get asked by friends: Why is my timer counting inaccurately and similar questions. I encountered many such issues when I was a beginner, and even later in my work.
In fact, most issues with inaccurate timer counting are due to the timer clock: the actual clock is 84M, but it is programmed as 168M.
Some attentive friends have noticed the problem: the clock is half off, but they just don’t know where the issue lies.
In the Standard Peripheral Library (SPL), I habitually use the prescaler macro definition shown in the figure below:
Question: How do I know when to divide by 2 and when not to?
Answer: Check the RCC Clock Tree in the Reference Manual for the answer.
If you still can’t understand the clock tree in the Reference Manual, I suggest using STM32CubeMX to help.
Configuring Clock with STM32CubeMX
1. Select RCC to use an external clock (Crystal Ceramic Resonator), as shown below:
2. Configure the Clock Tree (taking 407 as an example, the principle is the same for other chips)
Pay attention to the red-marked position in the image above; I believe you will understand after looking at it.
Recommended Reading:
1. Precautions for the Macro Definition “Interrupt Function Interface”
2. Key Points for STM32 IAP Application Programming
3Conclusion
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