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CCS5.5 有些函数可以open declaration 有些不可以



大家好,我用的ccs5.5。有些文件里面的函数可以右键打开open declaration,有些右键打不开,而且有的函数字体成紫色,有的正常颜色,是因为打不开的函数是自己定义的,不是库函数才这样的吗,但是无论函数是在lib里面还是在.c文件里面,在使用之前,都应该有声明才可以用啊,为什么会打不开呢?