123 lines
4.3 KiB
C
123 lines
4.3 KiB
C
/****************************************************************************
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* arch/arm/src/stm32/stm32_pmstop.c
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*
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* Copyright (C) 2012 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <stdbool.h>
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#include "up_arch.h"
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#include "nvic.h"
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#include "stm32_pwr.h"
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#include "stm32_pm.h"
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/****************************************************************************
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* Private Data
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****************************************************************************/
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: stm32_pmstop
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*
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* Description:
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* Enter STOP mode.
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*
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* Input Parameters:
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* lpds - true: To further reduce power consumption in Stop mode, put the
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* internal voltage regulator in low-power mode using the LPDS bit
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* of the Power control register (PWR_CR).
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*
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* Returned Value:
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* Zero means that the STOP was successfully entered and the system has
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* been re-awakened. The internal volatage regulator is back to its
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* original state. Otherwise, STOP mode did not occur and a negated
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* errno value is returned to indicate the cause of the failure.
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*
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****************************************************************************/
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int stm32_pmstop(bool lpds)
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{
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uint32_t regval;
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/* Clear the Power Down Deep Sleep (PDDS) and the Low Power Deep Sleep
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* (LPDS)) bits in the power control register.
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*/
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regval = getreg32(STM32_PWR_CR);
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regval &= ~(PWR_CR_LPDS | PWR_CR_PDDS);
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/* Set the Low Power Deep Sleep (LPDS) bit if so requested */
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if (lpds)
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{
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regval |= PWR_CR_LPDS;
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}
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putreg32(regval, STM32_PWR_CR);
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/* Set SLEEPDEEP bit of Cortex System Control Register */
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regval = getreg32(NVIC_SYSCON);
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regval |= NVIC_SYSCON_SLEEPDEEP;
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putreg32(regval, NVIC_SYSCON);
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/* Sleep until the wakeup interrupt or event occurs */
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#ifdef CONFIG_PM_WFE
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/* Mode: SLEEP + Entry with WFE */
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asm("wfe");
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#else
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/* Mode: SLEEP + Entry with WFI */
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asm("wfi");
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#endif
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return OK;
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}
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