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mbed library sources

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targets/hal/TARGET_NXP/TARGET_LPC408X/sleep.c@636:b0d178e9fa10, 2016-07-07 (annotated)

Committer:
lzbpli
Date:
Thu Jul 07 06:48:59 2016 +0000
Revision:
636:b0d178e9fa10
Parent:
15:4892fe388435 
l053

Who changed what in which revision?

UserRevisionLine numberNew contents of line
bogdanm 15:4892fe388435 1 /* mbed Microcontroller Library
bogdanm 15:4892fe388435 2 * Copyright (c) 2006-2013 ARM Limited
bogdanm 15:4892fe388435 3 *
bogdanm 15:4892fe388435 4 * Licensed under the Apache License, Version 2.0 (the "License");
bogdanm 15:4892fe388435 5 * you may not use this file except in compliance with the License.
bogdanm 15:4892fe388435 6 * You may obtain a copy of the License at
bogdanm 15:4892fe388435 7 *
bogdanm 15:4892fe388435 8 * http://www.apache.org/licenses/LICENSE-2.0
bogdanm 15:4892fe388435 9 *
bogdanm 15:4892fe388435 10 * Unless required by applicable law or agreed to in writing, software
bogdanm 15:4892fe388435 11 * distributed under the License is distributed on an "AS IS" BASIS,
bogdanm 15:4892fe388435 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
bogdanm 15:4892fe388435 13 * See the License for the specific language governing permissions and
bogdanm 15:4892fe388435 14 * limitations under the License.
bogdanm 15:4892fe388435 15 */
bogdanm 15:4892fe388435 16 #include "sleep_api.h"
bogdanm 15:4892fe388435 17 #include "cmsis.h"
bogdanm 15:4892fe388435 18 #include "mbed_interface.h"
bogdanm 15:4892fe388435 19
bogdanm 15:4892fe388435 20 void sleep(void) {
bogdanm 15:4892fe388435 21 LPC_SC->PCON = 0x0;
bogdanm 15:4892fe388435 22
bogdanm 15:4892fe388435 23 // SRC[SLEEPDEEP] set to 0 = sleep
bogdanm 15:4892fe388435 24 SCB->SCR &= ~SCB_SCR_SLEEPDEEP_Msk;
bogdanm 15:4892fe388435 25
bogdanm 15:4892fe388435 26 // wait for interrupt
bogdanm 15:4892fe388435 27 __WFI();
bogdanm 15:4892fe388435 28 }
bogdanm 15:4892fe388435 29
bogdanm 15:4892fe388435 30 /*
bogdanm 15:4892fe388435 31 * The mbed lpc1768 does not support the deepsleep mode
bogdanm 15:4892fe388435 32 * as a debugger is connected to it (the mbed interface).
bogdanm 15:4892fe388435 33 *
bogdanm 15:4892fe388435 34 * As mentionned in an application note from NXP:
bogdanm 15:4892fe388435 35 *
bogdanm 15:4892fe388435 36 * http://www.po-star.com/public/uploads/20120319123122_141.pdf
bogdanm 15:4892fe388435 37 *
bogdanm 15:4892fe388435 38 * {{{
bogdanm 15:4892fe388435 39 * The user should be aware of certain limitations during debugging.
bogdanm 15:4892fe388435 40 * The most important is that, due to limitations of the Cortex-M3
bogdanm 15:4892fe388435 41 * integration, the LPC17xx cannot wake up in the usual manner from
bogdanm 15:4892fe388435 42 * Deep Sleep and Power-down modes. It is recommended not to use these
bogdanm 15:4892fe388435 43 * modes during debug. Once an application is downloaded via JTAG/SWD
bogdanm 15:4892fe388435 44 * interface, the USB to SWD/JTAG debug adapter (Keil ULINK2 for example)
bogdanm 15:4892fe388435 45 * should be removed from the target board, and thereafter, power cycle
bogdanm 15:4892fe388435 46 * the LPC17xx to allow wake-up from deep sleep and power-down modes
bogdanm 15:4892fe388435 47 * }}}
bogdanm 15:4892fe388435 48 *
bogdanm 15:4892fe388435 49 * As the interface firmware does not reset the target when a
bogdanm 15:4892fe388435 50 * mbed_interface_disconnect() semihosting call is made, the
bogdanm 15:4892fe388435 51 * core cannot wake-up from deepsleep.
bogdanm 15:4892fe388435 52 *
bogdanm 15:4892fe388435 53 * We treat a deepsleep() as a normal sleep().
bogdanm 15:4892fe388435 54 */
bogdanm 15:4892fe388435 55 void deepsleep(void) {
bogdanm 15:4892fe388435 56 sleep();
bogdanm 15:4892fe388435 57 }