70 lines
2.8 KiB
Plaintext
70 lines
2.8 KiB
Plaintext
/**
|
|
@page RCC_OutputSystemClockOnMCO RCC example
|
|
|
|
@verbatim
|
|
******************** (C) COPYRIGHT 2016 STMicroelectronics *******************
|
|
* @file Examples_LL/RCC/RCC_OutputSystemClockOnMCO/readme.txt
|
|
* @author MCD Application Team
|
|
* @brief Description of the RCC example.
|
|
******************************************************************************
|
|
* @attention
|
|
*
|
|
* <h2><center>© Copyright (c) 2016 STMicroelectronics.
|
|
* All rights reserved.</center></h2>
|
|
*
|
|
* 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
|
|
|
|
This example describes how to configure MCO pin (PA8) to output the system clock.
|
|
|
|
At start-up, USER button and MCO pin are configured. The program configures SYSCLK
|
|
to the max frequency using the PLL with HSE as clock source.
|
|
|
|
The signal on PA8 (or pin 23 of CN10 connector) can be monitored with an oscilloscope
|
|
to check the different MCO configuration set at each button press.
|
|
Different configuration will be observed
|
|
- SYSCLK frequency with frequency value around @72MHz.
|
|
- PLLCLK frequency value divided by 2, hence around @36MHz.
|
|
- HSE frequency with frequency value around @8MHz.
|
|
|
|
When user press User push-button, a LED2 toggle is done to indicate a change in MCO config.
|
|
|
|
|
|
@par Directory contents
|
|
|
|
- RCC/RCC_OutputSystemClockOnMCO/Inc/stm32f1xx_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/stm32f1xx_it.c Interrupt handlers
|
|
- RCC/RCC_OutputSystemClockOnMCO/Src/main.c Main program
|
|
- RCC/RCC_OutputSystemClockOnMCO/Src/system_stm32f1xx.c STM32F1xx system source file
|
|
|
|
|
|
@par Hardware and Software environment
|
|
|
|
- This example runs on STM32F103xB devices.
|
|
|
|
- This example has been tested with STM32F103RB-Nucleo board and can be
|
|
easily tailored to any other supported device and development board.
|
|
|
|
- STM32F103RB-Nucleo Set-up
|
|
- Connect the MCO pin to an oscilloscope to monitor the different waveforms:
|
|
- PA.08: connected to pin 23 of CN10 connector for Nucleo-64 (MB1136)
|
|
|
|
@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>
|
|
*/
|