File content as of revision 162:16168a1438f3:

/* mbed Microcontroller Library
 * Copyright (c) 2006-2013 ARM Limited
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
#include "sleep_api.h"
#include "cmsis.h"
#include "mbed_interface.h"
#include "mbed_toolchain.h"

MBED_WEAK void hal_sleep(void)
{
    // ensure debug is disconnected if semihost is enabled....
    NRF_POWER->TASKS_LOWPWR = 1;
    // wait for interrupt
    __WFE();
}

MBED_WEAK void hal_deepsleep(void)
{
    hal_sleep();
    //   NRF_POWER->SYSTEMOFF=1;
}