91 lines
3.5 KiB
Plaintext
91 lines
3.5 KiB
Plaintext
/**
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@page PWR_EnterStandbyMode PWR standby example
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@verbatim
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******************** (C) COPYRIGHT 2016 STMicroelectronics *******************
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* @file Examples_LL/PWR/PWR_EnterStandbyMode/readme.txt
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* @author MCD Application Team
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* @brief Description of the PWR STANDBY mode 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 Standby mode and wake up from this mode by using an external
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reset or a wakeup interrupt.
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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 thru PC.13 and configured to generate an
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interrupt on rising edge upon key press.
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LED2 is toggled each 200 ms in order to indicate that MCU is in RUN mode.
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When a rising edge is detected on the EXTI line, an interrupt is generated.
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In the EXTI handler routine, the wake-up pin LL_PWR_WAKEUP_PIN1 is enabled and the
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corresponding wake-up flag cleared. Then, the system enters STANDBY mode causing
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LED2 to stop toggling.
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Next, a rising edge on PA.00 (connected to LL_PWR_WAKEUP_PIN1) will
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wake-up the system from STANDBY.
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Alternatively, an external RESET of the board will lead to a system wake-up as well.
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After wake-up from STANDBY mode, program execution restarts in the same way as
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after a RESET and LED2 restarts toggling.
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LED2 is used to monitor the system state as follows:
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- LED2 fast toggling: system in RUN mode
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- LED2 slow toggling: system in RUN mode after exiting from standby mode
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- LED2 off : system in STANDBY mode
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These steps are repeated in an infinite loop.
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@note To measure the current consumption in STANDBY mode, remove JP6 jumper
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and connect an ampere meter to JP6 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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@par Directory contents
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- PWR/PWR_EnterStandbyMode/Inc/stm32f1xx_it.h Interrupt handlers header file
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- PWR/PWR_EnterStandbyMode/Inc/main.h Header for main.c module
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- PWR/PWR_EnterStandbyMode/Inc/stm32_assert.h Template file to include assert_failed function
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- PWR/PWR_EnterStandbyMode/Src/stm32f1xx_it.c Interrupt handlers
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- PWR/PWR_EnterStandbyMode/Src/main.c Main program
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- PWR/PWR_EnterStandbyMode/Src/system_stm32f1xx.c STM32F1xx system source file
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@par Hardware and Software environment
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- This example runs on STM32F103xB 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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- Put a wire between PA.00 (connected to pin 28 on CN7 connector) and
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3.3V pin (pin 5 on CN7) to generate a rising edge on LL_PWR_WAKEUP_PIN1.
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- WakeUp Pin LL_PWR_WAKEUP_PIN1 connected to PA.00
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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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