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Error: L6200E: Symbol keyflag multiply defined (by main.o and key.o).

2022-07-22 08:27:00 【Crazy Alex】

The main reason for the above error is very simple

stay key.h The following two variables are defined in the file

uint8_t keyflag=0;
KEY_STATE keystate=KEY_DETECTED_STATE;

And initialize these two variables

This is not allowed ,

belong key.c Define these two variables in and initialize , And in key.h in

extern uint8_t keyflag;
extern KEY_STATE keystate;

So that we don't make a mistake

Of course, the above wrong English means to repeat the definition , It is also possible that the definition is indeed repeated

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