72 lines
2.8 KiB
Plaintext
72 lines
2.8 KiB
Plaintext
/**
|
|
@page RCC_OutputSystemClockOnMCO RCC example
|
|
|
|
@verbatim
|
|
******************************************************************************
|
|
* @file Examples_LL/RCC/RCC_OutputSystemClockOnMCO/readme.txt
|
|
* @author MCD Application Team
|
|
* @brief Description of the RCC example.
|
|
******************************************************************************
|
|
*
|
|
* Copyright (c) 2020 STMicroelectronics. All rights reserved.
|
|
*
|
|
* This software component is licensed by ST under BSD 3-Clause license,
|
|
* the "License"; You may not use this file except in compliance with the
|
|
* License. You may obtain a copy of the License at:
|
|
* opensource.org/licenses/BSD-3-Clause
|
|
*
|
|
******************************************************************************
|
|
@endverbatim
|
|
|
|
@par Example Description
|
|
|
|
Configuration of MCO pin (PA8) to output the system clock.
|
|
|
|
At start-up, User push-button (B1) and MCO pin are configured. The program configures SYSCLK
|
|
to the max frequency using the PLL with MSI as clock source.
|
|
|
|
The signal on PA8 (or pin 16 of CN10 connector) can be monitored with an oscilloscope
|
|
to check the different MCO configuration set at each User push-button (B1) press.
|
|
Different configuration will be observed
|
|
- SYSCLK frequency with frequency value around @48 MHz.
|
|
- PLLCLK frequency value divided by 4, hence around @12 MHz.
|
|
- MSI frequency value divided by 2, hence around @2 MHz.
|
|
|
|
When user press User push-button, a LED2 toggle is done to indicate a change in MCO config.
|
|
|
|
@par Keywords
|
|
|
|
System, RCC, PLL, HSI, PLLCLK, SYSCLK, HSE, Clock, Oscillator
|
|
|
|
|
|
@par Directory contents
|
|
|
|
- RCC/RCC_OutputSystemClockOnMCO/Inc/stm32wlxx_it.h Interrupt handlers header file
|
|
- RCC/RCC_OutputSystemClockOnMCO/Inc/main.h Header for main.c module
|
|
- RCC/RCC_OutputSystemClockOnMCO/Inc/stm32_assert.h Template file to include assert_failed function
|
|
- RCC/RCC_OutputSystemClockOnMCO/Src/stm32wlxx_it.c Interrupt handlers
|
|
- RCC/RCC_OutputSystemClockOnMCO/Src/main.c Main program
|
|
- RCC/RCC_OutputSystemClockOnMCO/Src/system_stm32wlxx.c STM32WLxx system source file
|
|
|
|
|
|
@par Hardware and Software environment
|
|
|
|
- This example runs on STM32WL55JCIx devices.
|
|
|
|
- This example has been tested with NUCLEO-WL55JC RevC board and can be
|
|
easily tailored to any other supported device and development board.
|
|
|
|
- NUCLEO-WL55JC RevC Set-up
|
|
- Connect the MCO pin to an oscilloscope to monitor the different waveforms:
|
|
- PA.08: connected to pin 16 of CN10 connector for Nucleo-WL55JC1 (MB1389)
|
|
|
|
@par How to use it ?
|
|
|
|
In order to make the program work, you must do the following :
|
|
- Open your preferred toolchain
|
|
- Rebuild all files and load your image into target memory
|
|
- Run the example
|
|
|
|
* <h3><center>© COPYRIGHT STMicroelectronics</center></h3>
|
|
*/
|