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有的话，函数名是什么呢？例如DELAY_US(100*1000); 之类的
// assembly fileextern void usDelay(uint32_t Count);
// **************************************************************************// the function prototypes
//! \brief Provides a prescribes micro-second delay//! \param[in] delay_usec The delay, usecextern void usDelay(const uint_least32_t delay_usec);
