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mbed SDK library sources

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Development branch of the mbed library sources. This library is kept in synch with the latest changes from the mbed SDK and it is not guaranteed to work.

If you are looking for a stable and tested release, please import one of the official mbed library releases:

Import librarymbed

The official Mbed 2 C/C++ SDK provides the software platform and libraries to build your applications.

Last commit 20 Feb 2019 by mbed official

targets/hal/TARGET_NXP/TARGET_LPC11XX_11CXX/sleep.c@30:91c1d09ada54, 2013-09-25 (annotated)

Committer:
mbed_official
Date:
Wed Sep 25 10:30:04 2013 +0100
Revision:
30:91c1d09ada54
Synchronized with git revision 8f57c1e84759991fa81ede0da2b4aabe8530fa09

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 30:91c1d09ada54 1 /* mbed Microcontroller Library
mbed_official 30:91c1d09ada54 2 * Copyright (c) 2006-2013 ARM Limited
mbed_official 30:91c1d09ada54 3 *
mbed_official 30:91c1d09ada54 4 * Licensed under the Apache License, Version 2.0 (the "License");
mbed_official 30:91c1d09ada54 5 * you may not use this file except in compliance with the License.
mbed_official 30:91c1d09ada54 6 * You may obtain a copy of the License at
mbed_official 30:91c1d09ada54 7 *
mbed_official 30:91c1d09ada54 8 * http://www.apache.org/licenses/LICENSE-2.0
mbed_official 30:91c1d09ada54 9 *
mbed_official 30:91c1d09ada54 10 * Unless required by applicable law or agreed to in writing, software
mbed_official 30:91c1d09ada54 11 * distributed under the License is distributed on an "AS IS" BASIS,
mbed_official 30:91c1d09ada54 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
mbed_official 30:91c1d09ada54 13 * See the License for the specific language governing permissions and
mbed_official 30:91c1d09ada54 14 * limitations under the License.
mbed_official 30:91c1d09ada54 15 */
mbed_official 30:91c1d09ada54 16 #include "sleep_api.h"
mbed_official 30:91c1d09ada54 17 #include "cmsis.h"
mbed_official 30:91c1d09ada54 18 #include "mbed_interface.h"
mbed_official 30:91c1d09ada54 19
mbed_official 30:91c1d09ada54 20 void sleep(void) {
mbed_official 30:91c1d09ada54 21 #if DEVICE_SEMIHOST
mbed_official 30:91c1d09ada54 22 // ensure debug is disconnected
mbed_official 30:91c1d09ada54 23 mbed_interface_disconnect();
mbed_official 30:91c1d09ada54 24 #endif
mbed_official 30:91c1d09ada54 25
mbed_official 30:91c1d09ada54 26 // PCON[DPDEN] set to sleep
mbed_official 30:91c1d09ada54 27 LPC_PMU->PCON = 0x0;
mbed_official 30:91c1d09ada54 28
mbed_official 30:91c1d09ada54 29 // SRC[SLEEPDEEP] set to 0 = sleep
mbed_official 30:91c1d09ada54 30 SCB->SCR &= ~SCB_SCR_SLEEPDEEP_Msk;
mbed_official 30:91c1d09ada54 31
mbed_official 30:91c1d09ada54 32 // wait for interrupt
mbed_official 30:91c1d09ada54 33 __WFI();
mbed_official 30:91c1d09ada54 34 }
mbed_official 30:91c1d09ada54 35
mbed_official 30:91c1d09ada54 36 /*
mbed_official 30:91c1d09ada54 37 * The mbed lpc1768 does not support the deepsleep mode
mbed_official 30:91c1d09ada54 38 * as a debugger is connected to it (the mbed interface).
mbed_official 30:91c1d09ada54 39 *
mbed_official 30:91c1d09ada54 40 * As mentionned in an application note from NXP:
mbed_official 30:91c1d09ada54 41 *
mbed_official 30:91c1d09ada54 42 * http://www.po-star.com/public/uploads/20120319123122_141.pdf
mbed_official 30:91c1d09ada54 43 *
mbed_official 30:91c1d09ada54 44 * {{{
mbed_official 30:91c1d09ada54 45 * The user should be aware of certain limitations during debugging.
mbed_official 30:91c1d09ada54 46 * The most important is that, due to limitations of the Cortex-M3
mbed_official 30:91c1d09ada54 47 * integration, the LPC17xx cannot wake up in the usual manner from
mbed_official 30:91c1d09ada54 48 * Deep Sleep and Power-down modes. It is recommended not to use these
mbed_official 30:91c1d09ada54 49 * modes during debug. Once an application is downloaded via JTAG/SWD
mbed_official 30:91c1d09ada54 50 * interface, the USB to SWD/JTAG debug adapter (Keil ULINK2 for example)
mbed_official 30:91c1d09ada54 51 * should be removed from the target board, and thereafter, power cycle
mbed_official 30:91c1d09ada54 52 * the LPC17xx to allow wake-up from deep sleep and power-down modes
mbed_official 30:91c1d09ada54 53 * }}}
mbed_official 30:91c1d09ada54 54 *
mbed_official 30:91c1d09ada54 55 * As the interface firmware does not reset the target when a
mbed_official 30:91c1d09ada54 56 * mbed_interface_disconnect() semihosting call is made, the
mbed_official 30:91c1d09ada54 57 * core cannot wake-up from deepsleep.
mbed_official 30:91c1d09ada54 58 *
mbed_official 30:91c1d09ada54 59 * We treat a deepsleep() as a normal sleep().
mbed_official 30:91c1d09ada54 60 */
mbed_official 30:91c1d09ada54 61
mbed_official 30:91c1d09ada54 62 void deepsleep(void) {
mbed_official 30:91c1d09ada54 63 #if DEVICE_SEMIHOST
mbed_official 30:91c1d09ada54 64 // ensure debug is disconnected
mbed_official 30:91c1d09ada54 65 mbed_interface_disconnect();
mbed_official 30:91c1d09ada54 66 #endif
mbed_official 30:91c1d09ada54 67
mbed_official 30:91c1d09ada54 68 // PCON[DPDEN] set to deepsleep
mbed_official 30:91c1d09ada54 69 LPC_PMU->PCON = 0x2;
mbed_official 30:91c1d09ada54 70
mbed_official 30:91c1d09ada54 71 // SRC[SLEEPDEEP] set to 1 = deep sleep
mbed_official 30:91c1d09ada54 72 SCB->SCR |= SCB_SCR_SLEEPDEEP_Msk;
mbed_official 30:91c1d09ada54 73
mbed_official 30:91c1d09ada54 74 // Power up everything after powerdown
mbed_official 30:91c1d09ada54 75 LPC_SYSCON->PDAWAKECFG &= 0xFFFFF800;
mbed_official 30:91c1d09ada54 76
mbed_official 30:91c1d09ada54 77 // wait for interrupt
mbed_official 30:91c1d09ada54 78 __WFI();
mbed_official 30:91c1d09ada54 79 }