1. In the ST Visual Develop development environment, variables cannot be defined in .h files. You need to define the variables in .C files and then declare them in .H files. Supplement: Today I suddenly found another situation. After a variable is defined in a .h file, it can be declared as extern in another .h file. Later, I found that these two .h files do not have their own .c files and are both in the same level path of the project file instead of in the module file.
2. If the ST Visual Develop development environment has problems such as slow entry or exit from DEBUG, or the menu bar disappears, it means that there is something wrong with the project file. You can just create a new project or copy and replace the recently OK project file. However, the latter may not be thorough, so it is recommended to use the former to solve the problem.
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Professor at Beihang University, dedicated to promoting microcontrollers and embedded systems for over 20 years.
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