97 lines
3.1 KiB
C
97 lines
3.1 KiB
C
/****************************************************************************
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* arch/arm/src/stm32/stm32_pmstandby.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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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 "arm_internal.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_pmstandby
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*
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* Description:
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* Enter STANDBY mode.
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*
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* Input Parameters:
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* None
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*
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* Returned Value:
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* On success, this function will not return (STANDBY mode can only be
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* terminated with a reset event). Otherwise, STANDBY mode did not occur
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* and a negated errno value is returned to indicate the cause of the
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* failure.
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*
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****************************************************************************/
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int stm32_pmstandby(void)
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{
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uint32_t regval;
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/* Clear the Wake-Up Flag by setting the CWUF bit in the power control
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* register.
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*/
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regval = getreg32(STM32_PWR_CR);
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regval |= PWR_CR_CWUF;
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putreg32(regval, STM32_PWR_CR);
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/* Set the Power Down Deep Sleep (PDDS) bit in the power control
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* register.
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*/
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regval |= PWR_CR_PDDS;
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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 reset occurs */
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asm("wfi");
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return OK; /* Won't get here */
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}
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