mirror of https://github.com/ARMmbed/mbed-os.git
58 lines
2.0 KiB
C
58 lines
2.0 KiB
C
/* mbed Microcontroller Library
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* Copyright (c) 2006-2013 ARM Limited
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "sleep_api.h"
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#include "cmsis.h"
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#include "mbed_interface.h"
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void hal_sleep(void) {
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LPC_SC->PCON = 0x0;
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// SRC[SLEEPDEEP] set to 0 = sleep
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SCB->SCR &= ~SCB_SCR_SLEEPDEEP_Msk;
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// wait for interrupt
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__WFI();
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}
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/*
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* The mbed lpc1768 does not support the deepsleep mode
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* as a debugger is connected to it (the mbed interface).
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*
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* As mentionned in an application note from NXP:
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*
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* http://www.po-star.com/public/uploads/20120319123122_141.pdf
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*
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* {{{
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* The user should be aware of certain limitations during debugging.
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* The most important is that, due to limitations of the Cortex-M3
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* integration, the LPC17xx cannot wake up in the usual manner from
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* Deep Sleep and Power-down modes. It is recommended not to use these
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* modes during debug. Once an application is downloaded via JTAG/SWD
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* interface, the USB to SWD/JTAG debug adapter (Keil ULINK2 for example)
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* should be removed from the target board, and thereafter, power cycle
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* the LPC17xx to allow wake-up from deep sleep and power-down modes
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* }}}
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*
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* As the interface firmware does not reset the target when a
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* mbed_interface_disconnect() semihosting call is made, the
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* core cannot wake-up from deepsleep.
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*
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* We treat a deepsleep() as a normal sleep().
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*/
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void hal_deepsleep(void) {
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hal_sleep();
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}
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