How can I wake up cpu when I use sd_app_event_wait() to manage power?

Question

When I use ble_app_hids_mouse demo to test my mouse sensor, it seems that mouse arrow will delay about 300ms to start send data ,at the beginning of movement. 
 When I cut the function "power_manage()", delay phenomenon is solved but the arrow will not smooth anymore. 
 How can I do to keep it move smooth and solve the delay problem cause by "sd_app_event_wait()" ? 
 Is there any func to wake up the cpu from "sd_app_event_wait()"?

gootoomoon · Accepted Answer

That's very kind of you. 
 /**@brief Function for the Power manager.
*/
static void power_manage(void)
{
uint32_t err_code = sd_app_event_wait();
APP_ERROR_CHECK(err_code);
} 
 /**@brief Function for application main entry.
 */
int main(void)
{
 timers_init();
 gpiote_init();
 buttons_init();
	sensor_init();
 bond_manager_init();
 ble_stack_init();
 scheduler_init();
 gap_params_init();
 advertising_init(BLE_GAP_ADV_FLAGS_LE_ONLY_LIMITED_DISC_MODE);
 services_init();
 sensor_sim_init();
 conn_params_init();
 sec_params_init();
 radio_notification_init();
 
	//NRF_POWER->TASKS_CONSTLAT = 1; //try to get in to CONSTLAT mode

 timers_start();
 advertising_start();
 
 // Enter main loop.
 for (;;)
 {	

 if(button_pressed == true)
 button_check(); 

 mouse_sensor_send();
 app_sched_execute();
 power_manage();
 }
}
 
 I can tell by logic analyzer that it always take about 300ms to wake up from "sd_app_event_wait()", this will cause problem that I can't move mouse smoothly at the start. Sensor date will accumulate during this 300ms. 
 I must short the wake up time. 
 And I try to enable constant latency mode by "NRF_POWER->TASKS_CONSTLAT = 1;" , but after I add this code, I can't even find my BLE device by Android 4.4 or win8.1 PC. 
 The hole project as attachment. 
 OS : Win8.1 / Nexus 7 II (Android 4.4.2)
SD: s110_nrf51822_5.2.1_softdevice
SDK: nrf51_sdk_v4_4_2_33551 
 HW: nrf51822 DK