Ermanno Brusadin / mbed-src

mbed library sources

targets/hal/TARGET_NXP/TARGET_LPC408X/sleep.c@0:0a673c671a56, 2016-07-27 (annotated)

Committer:
ebrus
Date:
Wed Jul 27 18:35:32 2016 +0000
Revision:
0:0a673c671a56
4

Who changed what in which revision?

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ebrus 0:0a673c671a56 1 /* mbed Microcontroller Library
ebrus 0:0a673c671a56 2 * Copyright (c) 2006-2013 ARM Limited
ebrus 0:0a673c671a56 3 *
ebrus 0:0a673c671a56 4 * Licensed under the Apache License, Version 2.0 (the "License");
ebrus 0:0a673c671a56 5 * you may not use this file except in compliance with the License.
ebrus 0:0a673c671a56 6 * You may obtain a copy of the License at
ebrus 0:0a673c671a56 7 *
ebrus 0:0a673c671a56 8 * http://www.apache.org/licenses/LICENSE-2.0
ebrus 0:0a673c671a56 9 *
ebrus 0:0a673c671a56 10 * Unless required by applicable law or agreed to in writing, software
ebrus 0:0a673c671a56 11 * distributed under the License is distributed on an "AS IS" BASIS,
ebrus 0:0a673c671a56 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
ebrus 0:0a673c671a56 13 * See the License for the specific language governing permissions and
ebrus 0:0a673c671a56 14 * limitations under the License.
ebrus 0:0a673c671a56 15 */
ebrus 0:0a673c671a56 16 #include "sleep_api.h"
ebrus 0:0a673c671a56 17 #include "cmsis.h"
ebrus 0:0a673c671a56 18 #include "mbed_interface.h"
ebrus 0:0a673c671a56 19
ebrus 0:0a673c671a56 20 void sleep(void) {
ebrus 0:0a673c671a56 21 LPC_SC->PCON = 0x0;
ebrus 0:0a673c671a56 22
ebrus 0:0a673c671a56 23 // SRC[SLEEPDEEP] set to 0 = sleep
ebrus 0:0a673c671a56 24 SCB->SCR &= ~SCB_SCR_SLEEPDEEP_Msk;
ebrus 0:0a673c671a56 25
ebrus 0:0a673c671a56 26 // wait for interrupt
ebrus 0:0a673c671a56 27 __WFI();
ebrus 0:0a673c671a56 28 }
ebrus 0:0a673c671a56 29
ebrus 0:0a673c671a56 30 /*
ebrus 0:0a673c671a56 31 * The mbed lpc1768 does not support the deepsleep mode
ebrus 0:0a673c671a56 32 * as a debugger is connected to it (the mbed interface).
ebrus 0:0a673c671a56 33 *
ebrus 0:0a673c671a56 34 * As mentionned in an application note from NXP:
ebrus 0:0a673c671a56 35 *
ebrus 0:0a673c671a56 36 * http://www.po-star.com/public/uploads/20120319123122_141.pdf
ebrus 0:0a673c671a56 37 *
ebrus 0:0a673c671a56 38 * {{{
ebrus 0:0a673c671a56 39 * The user should be aware of certain limitations during debugging.
ebrus 0:0a673c671a56 40 * The most important is that, due to limitations of the Cortex-M3
ebrus 0:0a673c671a56 41 * integration, the LPC17xx cannot wake up in the usual manner from
ebrus 0:0a673c671a56 42 * Deep Sleep and Power-down modes. It is recommended not to use these
ebrus 0:0a673c671a56 43 * modes during debug. Once an application is downloaded via JTAG/SWD
ebrus 0:0a673c671a56 44 * interface, the USB to SWD/JTAG debug adapter (Keil ULINK2 for example)
ebrus 0:0a673c671a56 45 * should be removed from the target board, and thereafter, power cycle
ebrus 0:0a673c671a56 46 * the LPC17xx to allow wake-up from deep sleep and power-down modes
ebrus 0:0a673c671a56 47 * }}}
ebrus 0:0a673c671a56 48 *
ebrus 0:0a673c671a56 49 * As the interface firmware does not reset the target when a
ebrus 0:0a673c671a56 50 * mbed_interface_disconnect() semihosting call is made, the
ebrus 0:0a673c671a56 51 * core cannot wake-up from deepsleep.
ebrus 0:0a673c671a56 52 *
ebrus 0:0a673c671a56 53 * We treat a deepsleep() as a normal sleep().
ebrus 0:0a673c671a56 54 */
ebrus 0:0a673c671a56 55 void deepsleep(void) {
ebrus 0:0a673c671a56 56 sleep();
ebrus 0:0a673c671a56 57 }