This article describes the matters that should be paid attention to when porting ANSIC programs to KeilC51. Based on the author\'s experience of using KeilC51 to write and port programs, the article describes the matters that need to be paid attention to when porting, such as storage type, pointer type, reentrant function, segment positioning and simulation stack settings according to the distribution of the target system RAM, function pointer, NULL pointer problem, byte order, cross assembly, etc. The impact of storage type, pointer type, and reentrant function on program efficiency is analyzed, thus providing guidance on how to perform efficient porting. Finally, the article takes the porting of ucosii to the small mode of KeilC51 as an example, and describes the general steps of porting, hoping to provide readers with a reference for correctly and efficiently porting ANSIC programs to KeilC51.
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