Error: l6218e: undefined symbol appears when keil calls lib

1. Recently, when using MDK to generate lib, Keil failed to call lib, resulting in a lot of undefined problems

2. When generating lib with keil for testing, you can’t add the header file to the project.

        Delete all. H files, regenerate the Lib file, and call again. It is found that there will be no more problems such as error: l6218e: undefined symbol

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