108 lines
4.7 KiB
Plaintext
108 lines
4.7 KiB
Plaintext
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/**
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@page PWR_STOP PWR Stop Mode example
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@verbatim
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******************** (C) COPYRIGHT 2017 STMicroelectronics *******************
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* @file PWR/PWR_STOP/Readme.txt
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* @author MCD Application Team
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* @brief Description of the PWR Stop Mode example.
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******************************************************************************
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* @attention
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*
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* <h2><center>© Copyright (c) 2017 STMicroelectronics.
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* All rights reserved.</center></h2>
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*
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* This software component is licensed by ST under BSD 3-Clause license,
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* the "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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* opensource.org/licenses/BSD-3-Clause
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*
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******************************************************************************
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@endverbatim
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@par Example Description
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How to enter the Stop mode and wake up from this mode by using the RTC wakeup
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timer event or an interrupt.
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This example shows how to enters the system to STOP mode and wake-up from this
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mode using RTC Wake-up Timer Event connected to EXTI Line 22 or Key push button
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EXTI Line 15.
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In the associated software
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- the system clock is set to 120 MHz
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- the EXTI_Line15 is configured to generate interrupt on falling edge
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- the EXTI_Line22 connected internally to the RTC Wake-up event is configured
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to generate an interrupt on rising edge each 4s
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- the SysTick is programmed to generate an interrupt each 1 ms
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In the SysTick interrupt handler, LED2 is toggled, this is used to indicate whether
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the MCU is in STOP or RUN mode.
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The system enters STOP mode and will wait for the RTC Wake-up event to be
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generated each 4s, or Key push button is pressed.
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- If the RTC Wake-up event (EXTI_Line22) is the source of wake-up from STOP, LED1 is toggled.
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- If the Key button (EXTI_Line15) is the source of wake-up from STOP, LED4 is toggled.
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This behavior is repeated in an infinite loop.
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LEDs are used to monitor the system state as following:
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- LED1 toggled: system woken up from STOP using RTC Wake-up Interrupt
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- LED2 toggling: system in RUN mode
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- LED3 Initialization error (RTC, RCC,...)
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- LED4 toggled: system woken up from STOP using EXTI_Line15 (KEY push button)
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@note To measure the current consumption in STOP mode, please refer to
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@subpage PWR_CurrentConsumption example.
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@note This example can not be used in DEBUG mode, this is due to the fact
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that the Cortex-M3 core is no longer clocked during low power mode
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so debugging features are disabled
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@note Care must be taken when using HAL_Delay(), this function provides accurate delay (in milliseconds)
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based on variable incremented in SysTick ISR. This implies that if HAL_Delay() is called from
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a peripheral ISR process, then the SysTick interrupt must have higher priority (numerically lower)
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than the peripheral interrupt. Otherwise the caller ISR process will be blocked.
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To change the SysTick interrupt priority you have to use HAL_NVIC_SetPriority() function.
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@note The application needs to ensure that the SysTick time base is always set to 1 millisecond
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to have correct HAL operation.
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@note Care must be taken when HAL_RCCEx_PeriphCLKConfig() is used to select the RTC clock source; in this
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case the Backup domain will be reset in order to modify the RTC Clock source, as consequence RTC
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registers (including the backup registers) and RCC_BDCR register are set to their reset values.
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@par Directory contents
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- PWR/PWR_STOP/Inc/stm32f2xx_hal_conf.h HAL configuration file
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- PWR/PWR_STOP/Inc/stm32f2xx_it.h Interrupt handlers header file
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- PWR/PWR_STOP/Inc/main.h Main program header file
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- PWR/PWR_STOP/Src/system_stm32f2xx.c STM32F2xx system clock configuration file
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- PWR/PWR_STOP/Src/stm32f2xx_it.c Interrupt handlers
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- PWR/PWR_STOP/Src/main.c Main program
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- PWR/PWR_STOP/Src/stm32f2xx_hal_msp.c HAL MSP module
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@par Hardware and Software environment
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- This example runs on STM32F207xx/217xx device.
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- This example has been tested with STMicroelectronics STM322xG-EVAL
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evaluation boards and can be easily tailored to any other supported device
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and development board.
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- STM322xG-EVAL Set-up
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- Use LED1, LED2, LED3 and LED4 connected respectively to PG.06, PG.08, PI.09 and PC.07 pins
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- Use the Key push-button connected to pin PG15 (EXTI_Line15)
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@par How to use it ?
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In order to make the program work, you must do the following :
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- Open your preferred toolchain
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- Rebuild all files and load your image into target memory
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- Run the example
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* <h3><center>© COPYRIGHT STMicroelectronics</center></h3>
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*/
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