nrf51822低功耗睡眠模式的软件应用？

       

                Waits for an application event.
       

       

                An application event is either an application interrupt or a pended
interrupt when the interrupt is disabled. When the interrupt is enabled
it will be taken immediately since this function will wait in thread
mode, then the execution will return in the application's main thread.
When an interrupt is disabled and gets pended it will return to the
application's thread main. The application must ensure that the pended
flag is cleared using sd_nvic_ClearPendingIRQ in order to sleep using this function. This is only necessary for
disabled interrupts, as the interrupt handler will clear the pending
flag automatically for enabled interrupts.
       

       

                In order to wake up from disabled interrupts, the SEVONPEND flag has to be set in the Cortex-M0 System Control Register (SCR).
       

See AlsoCMSIS_SCBNoteIf an application interrupt
has happened since the last time sd_app_evt_wait was called this
function will return immediately and not go to sleep. This is to avoid
race conditions that can occur when a flag is updated in the interrupt
handler and processed in the main loop.PostconditionAn application interrupt has happened or a interrupt pending flag is set.Return values
       
               
                       
                               
                               
                       
               
       

NRF_SUCCESS

小弟英文水平有限，看了几遍也没看明白这个函数到底有什么作用？如何用？ 哪位大哥大姐大神，百忙中能抽点空，帮看看讨论讨论，拜谢哪。