Lee Kai Xuan / mbed-os

mbed-os

Fork of mbed-os by erkin yucel

targets/TARGET_STM/TARGET_STM32L4/sleep.c@1:3deb71413561, 2017-07-20 (annotated)

Committer:
xuaner
Date:
Thu Jul 20 14:26:57 2017 +0000
Revision:
1:3deb71413561
Parent:
0:f269e3021894 
mbed_os

Who changed what in which revision?

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elessair 0:f269e3021894 1 /* mbed Microcontroller Library
elessair 0:f269e3021894 2 *******************************************************************************
elessair 0:f269e3021894 3 * Copyright (c) 2015, STMicroelectronics
elessair 0:f269e3021894 4 * All rights reserved.
elessair 0:f269e3021894 5 *
elessair 0:f269e3021894 6 * Redistribution and use in source and binary forms, with or without
elessair 0:f269e3021894 7 * modification, are permitted provided that the following conditions are met:
elessair 0:f269e3021894 8 *
elessair 0:f269e3021894 9 * 1. Redistributions of source code must retain the above copyright notice,
elessair 0:f269e3021894 10 * this list of conditions and the following disclaimer.
elessair 0:f269e3021894 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
elessair 0:f269e3021894 12 * this list of conditions and the following disclaimer in the documentation
elessair 0:f269e3021894 13 * and/or other materials provided with the distribution.
elessair 0:f269e3021894 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
elessair 0:f269e3021894 15 * may be used to endorse or promote products derived from this software
elessair 0:f269e3021894 16 * without specific prior written permission.
elessair 0:f269e3021894 17 *
elessair 0:f269e3021894 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
elessair 0:f269e3021894 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
elessair 0:f269e3021894 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
elessair 0:f269e3021894 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
elessair 0:f269e3021894 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
elessair 0:f269e3021894 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
elessair 0:f269e3021894 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
elessair 0:f269e3021894 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
elessair 0:f269e3021894 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
elessair 0:f269e3021894 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
elessair 0:f269e3021894 28 *******************************************************************************
elessair 0:f269e3021894 29 */
elessair 0:f269e3021894 30 #include "sleep_api.h"
elessair 0:f269e3021894 31 #include "rtc_api_hal.h"
elessair 0:f269e3021894 32
elessair 0:f269e3021894 33 #if DEVICE_SLEEP
elessair 0:f269e3021894 34
elessair 0:f269e3021894 35 #include "cmsis.h"
elessair 0:f269e3021894 36
elessair 0:f269e3021894 37 void sleep(void) {
elessair 0:f269e3021894 38 // Stop HAL systick
elessair 0:f269e3021894 39 HAL_SuspendTick();
elessair 0:f269e3021894 40 // Request to enter SLEEP mode
elessair 0:f269e3021894 41 HAL_PWR_EnterSLEEPMode(PWR_MAINREGULATOR_ON, PWR_SLEEPENTRY_WFI);
elessair 0:f269e3021894 42 // Restart HAL systick
elessair 0:f269e3021894 43 HAL_ResumeTick();
elessair 0:f269e3021894 44 }
elessair 0:f269e3021894 45
elessair 0:f269e3021894 46 void deepsleep(void)
elessair 0:f269e3021894 47 {
elessair 0:f269e3021894 48 // Stop HAL systick
elessair 0:f269e3021894 49 HAL_SuspendTick();
elessair 0:f269e3021894 50
elessair 0:f269e3021894 51 // Request to enter STOP mode 1 with regulator in low power mode
elessair 0:f269e3021894 52 if (__HAL_RCC_PWR_IS_CLK_ENABLED()) {
elessair 0:f269e3021894 53 HAL_PWREx_EnableLowPowerRunMode();
elessair 0:f269e3021894 54 HAL_PWR_EnterSTOPMode(PWR_LOWPOWERREGULATOR_ON, PWR_STOPENTRY_WFI);
elessair 0:f269e3021894 55 HAL_PWREx_DisableLowPowerRunMode();
elessair 0:f269e3021894 56 } else {
elessair 0:f269e3021894 57 __HAL_RCC_PWR_CLK_ENABLE();
elessair 0:f269e3021894 58 HAL_PWREx_EnableLowPowerRunMode();
elessair 0:f269e3021894 59 HAL_PWR_EnterSTOPMode(PWR_LOWPOWERREGULATOR_ON, PWR_STOPENTRY_WFI);
elessair 0:f269e3021894 60 HAL_PWREx_DisableLowPowerRunMode();
elessair 0:f269e3021894 61 __HAL_RCC_PWR_CLK_DISABLE();
elessair 0:f269e3021894 62 }
elessair 0:f269e3021894 63
elessair 0:f269e3021894 64 // After wake-up from STOP reconfigure the PLL
elessair 0:f269e3021894 65 SetSysClock();
elessair 0:f269e3021894 66
elessair 0:f269e3021894 67 // Restart HAL systick
elessair 0:f269e3021894 68 HAL_ResumeTick();
elessair 0:f269e3021894 69
elessair 0:f269e3021894 70 #if DEVICE_LOWPOWERTIMER
elessair 0:f269e3021894 71 rtc_synchronize();
elessair 0:f269e3021894 72 #endif
elessair 0:f269e3021894 73 }
elessair 0:f269e3021894 74
elessair 0:f269e3021894 75 #endif