CC2640，进入睡眠后，按键无法唤醒

如题，调用Power_shutdown(NULL)函数后，点动按键无法唤醒，哪里不对？请指点，谢谢！

//Enable wakeup
PIN_setConfig(hKeyPins, PINCC26XX_BM_WAKEUP, Board_KEY_SELECT | (PINCC26XX_WAKEUP_POSEDGE));
PIN_setConfig(hKeyPins, PINCC26XX_BM_WAKEUP, Board_KEY_UP | (PINCC26XX_WAKEUP_POSEDGE));
PIN_setConfig(hKeyPins, PINCC26XX_BM_WAKEUP, Board_KEY_DOWN | (PINCC26XX_WAKEUP_POSEDGE));
PIN_setConfig(hKeyPins, PINCC26XX_BM_WAKEUP, Board_KEY_LEFT | (PINCC26XX_WAKEUP_POSEDGE));
PIN_setConfig(hKeyPins, PINCC26XX_BM_WAKEUP, Board_KEY_RIGHT | (PINCC26XX_WAKEUP_POSEDGE));