71 lines
2.9 KiB
Plaintext
71 lines
2.9 KiB
Plaintext
/**
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@page RCC_UseHSI_PLLasSystemClock RCC example
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@verbatim
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******************************************************************************
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* @file Examples_LL/RCC/RCC_UseHSI_PLLasSystemClock/readme.txt
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* @author MCD Application Team
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* @brief Description of the RCC_UseHSI_PLLasSystemClock 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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Modification of the PLL parameters in run time.
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In this example, the toggling frequency of the green LED2 depends on the system clock
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frequency and, each time the User push-button (B1) is pressed, the PLL switches between two configurations.
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This make the LED2 blinking speed to highlight the system clock frequency changes.
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In this example, after start-up, SYSCLK is configured to the max frequency using the PLL with
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MSI as clock source.
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Then, when pressing User push-button (B1), an automatic switch is done between PLL with HSI as clock source (SYSCLK
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set to 16 MHz) and PLL with HSI as clock source (SYSCLK set to 48 MHz).
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LED2 will toggle differently between the 2 configurations (quick toggle with SYSCLK configuration at 48 MHz).
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To detect a problem with PLL configuration, switch USE_TIMEOUT can be enabled. Then in case of issues,
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LED2 will toggle every 1 second.
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Note: "uwFrequency" variable can be added in LiveWatch to monitor the system clock frequency.
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@par Keywords
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System, RCC, PLL, PLLCLK, SYSCLK, HSE, Clock, Oscillator, HSI
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@par Directory contents
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- RCC/RCC_UseHSI_PLLasSystemClock/Inc/stm32wlxx_it.h Interrupt handlers header file
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- RCC/RCC_UseHSI_PLLasSystemClock/Inc/main.h Header for main.c module
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- RCC/RCC_UseHSI_PLLasSystemClock/Inc/stm32_assert.h Template file to include assert_failed function
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- RCC/RCC_UseHSI_PLLasSystemClock/Src/stm32wlxx_it.c Interrupt handlers
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- RCC/RCC_UseHSI_PLLasSystemClock/Src/main.c Main program
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- RCC/RCC_UseHSI_PLLasSystemClock/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 NUCLEO-WL55JC RevC board and can be
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easily tailored to any other supported device and development board.
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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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