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108 lines
4.9 KiB
Plaintext
108 lines
4.9 KiB
Plaintext
/**
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@page PWR_EnterStandbyMode PWR standby example
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@verbatim
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******************** (C) COPYRIGHT 2017 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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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. Neither the name of STMicroelectronics nor the names of its contributors
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* may be 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 "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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******************************************************************************
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@endverbatim
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@par Example Description
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This example shows how to enter the system in STANDBY mode and wake-up from this
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mode using external RESET or wake-up interrupt.
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In the associated software, the system clock is set to 100 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-M4 core is no longer clocked during low power mode
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so debugging features are disabled.
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@par Keywords
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Power, PWR, Standby mode, Interrupt, EXTI, Wakeup, Low Power, External reset,
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@par Directory contents
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- PWR/PWR_EnterStandbyMode/Inc/stm32f4xx_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/stm32f4xx_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_stm32f4xx.c STM32F4xx system source file
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@par Hardware and Software environment
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- This example runs on STM32F411xx devices.
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- This example has been tested with STMicroelectronics NUCLEO-F411RE
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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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- NUCLEO-F411RE Set-up
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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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* <h3><center>© COPYRIGHT STMicroelectronics</center></h3>
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*/
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