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请教CC2540/CC2541中有关函数定义的问题?



1、在协议栈代码中经常看到,有些函数只有定义,没有函数体,但还能实现功能,这是怎么回事

2、我知道TI自带的有些函数是只开放API,而不开放源代码

3、我看到的这些,没开放源代码的函数,方案公司的人写的,也可以封装起来不开放源代码吗?这是怎么做到的