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Source Browser 'ble stack configure' - undefined Definition/Reference ! 用过STM32，但官方例程有些函数找不到定义，只有声明，我就搞不懂了。 还有user_main就是整个例程的主函数吧。
system_set_clock这个函数我们封起来了，你只需要设置你要的时钟就可以了 user_main就是主循环
