1 /* mbed Microcontroller Library
2 * Copyright (c) 2006-2013 ARM Limited
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
16 #include "sleep_api.h"
18 #include "mbed_interface.h"
22 #if (DEVICE_SEMIHOST == 1)
23 // ensure debug is disconnected
24 mbed_interface_disconnect();
27 // PCON[PD] set to sleep
30 // SRC[SLEEPDEEP] set to 0 = sleep
31 SCB->SCR &= ~SCB_SCR_SLEEPDEEP_Msk;
38 * The mbed lpc1768 does not support the deepsleep mode
39 * as a debugger is connected to it (the mbed interface).
41 * As mentionned in an application note from NXP:
43 * http://www.po-star.com/public/uploads/20120319123122_141.pdf
46 * The user should be aware of certain limitations during debugging.
47 * The most important is that, due to limitations of the Cortex-M3
48 * integration, the LPC17xx cannot wake up in the usual manner from
49 * Deep Sleep and Power-down modes. It is recommended not to use these
50 * modes during debug. Once an application is downloaded via JTAG/SWD
51 * interface, the USB to SWD/JTAG debug adapter (Keil ULINK2 for example)
52 * should be removed from the target board, and thereafter, power cycle
53 * the LPC17xx to allow wake-up from deep sleep and power-down modes
56 * As the interface firmware does not reset the target when a
57 * mbed_interface_disconnect() semihosting call is made, the
58 * core cannot wake-up from deepsleep.
60 * We treat a deepsleep() as a normal sleep().
63 void deepsleep(void) {
65 #if (DEVICE_SEMIHOST == 1)
66 // ensure debug is disconnected
67 mbed_interface_disconnect();
70 // PCON[PD] set to deepsleep