110 lines
4.0 KiB
Plaintext
110 lines
4.0 KiB
Plaintext
/**
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@page PWR_OptimizedRunMode PWR PWR_OptimizedRunMode
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@verbatim
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******************************************************************************
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* @file Examples_LL/PWR/PWR_OptimizedRunMode/readme.txt
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* @author MCD Application Team
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* @brief Description of the PWR Optimized Run Mode example.
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******************************************************************************
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*
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* Copyright (c) 2020 STMicroelectronics. All rights reserved.
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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 increase/decrease frequency and VCORE and how to enter/exit the
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Low-power run mode.
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In the associated software, the system clock is set to 48MHz, an EXTI line
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is connected to the User push-button (B1) through PA.00 and configured to generate an
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interrupt on falling edge upon key press.
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After start-up LED2 is toggling FAST (100ms blinking period), indicates that device
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is running at 48MHz.
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LED2 toggling speed is controlled by variable "uhLedBlinkSpeed".
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The User push-button (B1) can be pressed at any time to change Frequency, VCore(VOS)
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and Low Power Run mode.
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Initial STATE:
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--> Freq: 48MHz, VCore 1.2V, Core in Run Mode
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--> LED2 toggling FAST (100ms) - wait User push-button (B1) action
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STATE 2:
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User push-button (B1) pressed:
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--> Freq: 16MHz, VCore 1.0V, Core in Run Mode
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--> LED2 toggling MEDIUM (200ms) - wait User push-button (B1) action
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STATE 3:
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User push-button (B1) pressed:
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--> Freq: 100KHz, VCore 1.0V, Core in Low Power Run Mode
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--> LED2 toggling SLOW (400ms) - wait User push-button (B1) action
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STATE 4:
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User push-button (B1) pressed:
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--> Freq: 16MHz, VCore 1.0V, Core in Run Mode
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--> LED2 toggling MEDIUM (200ms) - wait User push-button (B1) action
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Final STATE:
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User push-button (B1) pressed:
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--> Freq: 48MHz, VCore 1.2V, Core in Run Mode
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--> LED2 toggling FAST (100ms) in infinite loop
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@note To measure MCU current consumption on board STM32WL Nucleo,
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board configuration must be applied:
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- remove all jumpers on connector JP8 to avoid leakages between ST-Link circuitry and STM32WL device.
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- remove jumper JP1 and connect an amperemeter to measure current between the 2 connectors of the jumper.
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NB: LED2 has an impact on power consumption.
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Remove LED2 blinking to have a constant power consumption,
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comment line "#define USE_LED" in main.c file
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@note This example may not be used in debug mode depending on IDE and debugger
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configuration selected, due to stsem low frequency and low power mode
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constraints.
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@par Keywords
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Power, PWR, Low-power run mode, Interrupt, VCORE, Low Power
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@par Directory contents
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- PWR/PWR_OptimizedRunMode/Inc/stm32wlxx_it.h Interrupt handlers header file
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- PWR/PWR_OptimizedRunMode/Inc/main.h Header for main.c module
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- PWR/PWR_OptimizedRunMode/Inc/stm32_assert.h Template file to include assert_failed function
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- PWR/PWR_OptimizedRunMode/Src/stm32wlxx_it.c Interrupt handlers
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- PWR/PWR_OptimizedRunMode/Src/main.c Main program
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- PWR/PWR_OptimizedRunMode/Src/system_stm32wlxx.c STM32WLxx system source file
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@par Hardware and Software environment
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- This example runs on STM32WL55JCIx devices.
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- This example has been tested with STMicroelectronics NUCLEO-WL55JC RevC
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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-WL55JC RevC Set-up
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- LED2 connected to pin PB.09
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- User push-button connected to pin 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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