98 lines
4.1 KiB
Plaintext
98 lines
4.1 KiB
Plaintext
/**
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@page PWR_STOP PWR Example
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@verbatim
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******************** (C) COPYRIGHT 2016 STMicroelectronics *******************
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* @file Examples_MIX/PWR/PWR_STOP/readme.txt
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* @author MCD Application Team
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* @brief Description of the PWR_STOP example.
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******************************************************************************
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* @attention
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*
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* Copyright (c) 2016 STMicroelectronics.
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* All rights reserved.
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*
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* This software is licensed under terms that can be found in the LICENSE file
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* in the root directory of this software component.
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* If no LICENSE file comes with this software, it is provided AS-IS.
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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 with Low power regulator mode and wake up from this mode by using external
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reset or wakeup interrupt (all the RCC function calls use RCC LL API
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for minimizing footprint and maximizing performance).
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In the associated software, the system clock is set to 72 MHz, an EXTI line
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is connected to the user button through PC.13 and configured to generate an
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interrupt on falling edge upon key press.
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The SysTick is programmed to generate an interrupt each 1 ms and in the SysTick
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interrupt handler, LED2 is toggled in order to indicate whether the MCU is in STOP with Low power regulator mode
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or RUN mode.
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5 seconds after start-up, the system automatically enters STOP with Low power regulator mode and
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LED2 stops toggling.
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The User push-button can be pressed at any time to wake-up the system.
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The software then comes back in RUN mode for 5 sec. before automatically entering STOP with Low power regulator mode again.
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LED2 is used to monitor the system state as follows:
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- LED2 ON: configuration failed (system will go to an infinite loop)
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- LED2 toggling: system in RUN mode
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- LED2 off : system in STOP with Low power regulator mode
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These steps are repeated in an infinite loop.
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@note To measure the current consumption in STOP with Low power regulator mode, remove JP5 jumper
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and connect an amperemeter to JP5 to measure IDD current.
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@note This example can not be used in DEBUG mode 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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@par Directory contents
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- Examples_MIX/PWR/PWR_STOP/Inc/stm32f1xx_conf.h HAL Configuration file
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- Examples_MIX/PWR/PWR_STOP/Inc/stm32f1xx_it.h Header for stm32f1xx_it.c
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- Examples_MIX/PWR/PWR_STOP/Inc/main.h Header file for main.c
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- Examples_MIX/PWR/PWR_STOP/Src/system_stm32f1xx.c STM32F1xx system clock configuration file
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- Examples_MIX/PWR/PWR_STOP/Src/stm32f1xx_it.c Interrupt handlers
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- Examples_MIX/PWR/PWR_STOP/Src/main.c Main program
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- Examples_MIX/PWR/PWR_STOP/Src/stm32f1xx_hal_msp.c HAL MSP module
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@par Hardware and Software environment
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- This example runs on STM32F1xx devices
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- This example has been tested with STMicroelectronics STM32F103RB-Nucleo
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board and can be easily tailored to any other supported device
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and development board.
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- STM32F103RB-Nucleo set-up:
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- LED2 connected to PA.05 pin
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- User push-button connected to pin PC.13 (External lines 10 to 15)
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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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*/
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