Ermanno Brusadin / mbed-src

mbed library sources

targets/hal/TARGET_NXP/TARGET_LPC11UXX/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 // ensure debug is disconnected
ebrus 0:0a673c671a56 22 #if DEVICE_SEMIHOST
ebrus 0:0a673c671a56 23 mbed_interface_disconnect();
ebrus 0:0a673c671a56 24 #endif
ebrus 0:0a673c671a56 25
ebrus 0:0a673c671a56 26 // PCON[PD] set to sleep
ebrus 0:0a673c671a56 27 LPC_PMU->PCON = 0x0;
ebrus 0:0a673c671a56 28
ebrus 0:0a673c671a56 29 // SRC[SLEEPDEEP] set to 0 = sleep
ebrus 0:0a673c671a56 30 SCB->SCR &= ~SCB_SCR_SLEEPDEEP_Msk;
ebrus 0:0a673c671a56 31
ebrus 0:0a673c671a56 32 // wait for interrupt
ebrus 0:0a673c671a56 33 __WFI();
ebrus 0:0a673c671a56 34 }
ebrus 0:0a673c671a56 35
ebrus 0:0a673c671a56 36 /*
ebrus 0:0a673c671a56 37 * The mbed lpc1768 does not support the deepsleep mode
ebrus 0:0a673c671a56 38 * as a debugger is connected to it (the mbed interface).
ebrus 0:0a673c671a56 39 *
ebrus 0:0a673c671a56 40 * As mentionned in an application note from NXP:
ebrus 0:0a673c671a56 41 *
ebrus 0:0a673c671a56 42 * http://www.po-star.com/public/uploads/20120319123122_141.pdf
ebrus 0:0a673c671a56 43 *
ebrus 0:0a673c671a56 44 * {{{
ebrus 0:0a673c671a56 45 * The user should be aware of certain limitations during debugging.
ebrus 0:0a673c671a56 46 * The most important is that, due to limitations of the Cortex-M3
ebrus 0:0a673c671a56 47 * integration, the LPC17xx cannot wake up in the usual manner from
ebrus 0:0a673c671a56 48 * Deep Sleep and Power-down modes. It is recommended not to use these
ebrus 0:0a673c671a56 49 * modes during debug. Once an application is downloaded via JTAG/SWD
ebrus 0:0a673c671a56 50 * interface, the USB to SWD/JTAG debug adapter (Keil ULINK2 for example)
ebrus 0:0a673c671a56 51 * should be removed from the target board, and thereafter, power cycle
ebrus 0:0a673c671a56 52 * the LPC17xx to allow wake-up from deep sleep and power-down modes
ebrus 0:0a673c671a56 53 * }}}
ebrus 0:0a673c671a56 54 *
ebrus 0:0a673c671a56 55 * As the interface firmware does not reset the target when a
ebrus 0:0a673c671a56 56 * mbed_interface_disconnect() semihosting call is made, the
ebrus 0:0a673c671a56 57 * core cannot wake-up from deepsleep.
ebrus 0:0a673c671a56 58 *
ebrus 0:0a673c671a56 59 * We treat a deepsleep() as a normal sleep().
ebrus 0:0a673c671a56 60 */
ebrus 0:0a673c671a56 61
ebrus 0:0a673c671a56 62 void deepsleep(void) {
ebrus 0:0a673c671a56 63 // ensure debug is disconnected
ebrus 0:0a673c671a56 64 #if DEVICE_SEMIHOST
ebrus 0:0a673c671a56 65 mbed_interface_disconnect();
ebrus 0:0a673c671a56 66 #endif
ebrus 0:0a673c671a56 67
ebrus 0:0a673c671a56 68 // PCON[PD] set to deepsleep
ebrus 0:0a673c671a56 69 LPC_PMU->PCON = 0x1;
ebrus 0:0a673c671a56 70
ebrus 0:0a673c671a56 71 // SRC[SLEEPDEEP] set to 1 = deep sleep
ebrus 0:0a673c671a56 72 SCB->SCR |= SCB_SCR_SLEEPDEEP_Msk;
ebrus 0:0a673c671a56 73
ebrus 0:0a673c671a56 74 // Power up everything after powerdown
ebrus 0:0a673c671a56 75 LPC_SYSCON->PDAWAKECFG &= 0xFFFFF800;
ebrus 0:0a673c671a56 76
ebrus 0:0a673c671a56 77 // wait for interrupt
ebrus 0:0a673c671a56 78 __WFI();
ebrus 0:0a673c671a56 79 }