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"
21 // ensure debug is disconnected
23 mbed_interface_disconnect();
26 // PCON[PD] set to sleep
29 // SRC[SLEEPDEEP] set to 0 = sleep
30 SCB->SCR &= ~SCB_SCR_SLEEPDEEP_Msk;
37 * The mbed lpc1768 does not support the deepsleep mode
38 * as a debugger is connected to it (the mbed interface).
40 * As mentionned in an application note from NXP:
42 * http://www.po-star.com/public/uploads/20120319123122_141.pdf
45 * The user should be aware of certain limitations during debugging.
46 * The most important is that, due to limitations of the Cortex-M3
47 * integration, the LPC17xx cannot wake up in the usual manner from
48 * Deep Sleep and Power-down modes. It is recommended not to use these
49 * modes during debug. Once an application is downloaded via JTAG/SWD
50 * interface, the USB to SWD/JTAG debug adapter (Keil ULINK2 for example)
51 * should be removed from the target board, and thereafter, power cycle
52 * the LPC17xx to allow wake-up from deep sleep and power-down modes
55 * As the interface firmware does not reset the target when a
56 * mbed_interface_disconnect() semihosting call is made, the
57 * core cannot wake-up from deepsleep.
59 * We treat a deepsleep() as a normal sleep().
62 void deepsleep(void) {
63 // ensure debug is disconnected
65 mbed_interface_disconnect();
68 // PCON[PD] set to deepsleep
71 // SRC[SLEEPDEEP] set to 1 = deep sleep
72 SCB->SCR |= SCB_SCR_SLEEPDEEP_Msk;
74 // Power up everything after powerdown
75 LPC_SYSCON->PDAWAKECFG &= 0xFFFFF800;