STM32CubeF4/Projects/STM32F410xx-Nucleo/Examples_LL/LPTIM/LPTIM_PulseCounter

/**
  @page LPTIM_PulseCounter LPTIM example
  
  @verbatim
  ******************** (C) COPYRIGHT 2017 STMicroelectronics *******************
  * @file    Examples_LL/LPTIM/LPTIM_PulseCounter/readme.txt 
  * @author  MCD Application Team
  * @brief   Description of the LPTIM_PulseCounter example.
  ******************************************************************************
  * @attention
  *
  * Copyright (c) 2017 STMicroelectronics.
  * All rights reserved.
  *
  * This software is licensed under terms that can be found in the LICENSE file
  * in the root directory of this software component.
  * If no LICENSE file comes with this software, it is provided AS-IS.
  *
  ******************************************************************************
   @endverbatim

@par Example Description

This example describes how to use the LPTIM in counter mode to generate a PWM
output signal and update PWM duty cycle. This example is based on the STM32F4xx
LPTIM LL API; peripheral initialization is done using LL unitary services functions
for optimization purpose (performance and size).

To reduce power consumption, MCU enters stop mode after starting counting. Each
time the counter reaches the maximum value (Period/Autoreload), an interruption
is generated, the MCU is woke up from stop mode and LED2 toggles the last state.
  
In this example Period value is set to 1000, so each time the counter counts
(1000 + 1) rising edges on LPTIM1_IN1 pin, an interrupt is generated and LED2
toggles. If the external function generator is set to provide a square waveform at 1Khz,
the led will toggle each second.

In this example the internal clock provided to the LPTIM1 is LSI (32 kHz),
so the external input is sampled with LSI clock. In order not to miss any event,
the frequency of the changes on the external Input1 signal should never exceed the
frequency of the internal clock provided to the LPTIM1 (LSI for the
present example).

@par Keywords

Timer, Low Power, Pulse Counter, Stop mode, Interrupt

@par Directory contents 

  - LPTIM/LPTIM_PulseCounter/Inc/stm32f4xx_it.h          Interrupt handlers header file
  - LPTIM/LPTIM_PulseCounter/Inc/main.h                  Header for main.c module
  - LPTIM/LPTIM_PulseCounter/Inc/stm32_assert.h          Template file to include assert_failed function
  - LPTIM/LPTIM_PulseCounter/Src/stm32f4xx_it.c          Interrupt handlers
  - LPTIM/LPTIM_PulseCounter/Src/main.c                  Main program
  - LPTIM/LPTIM_PulseCounter/Src/system_stm32f4xx.c      STM32F4xx system source file


@par Hardware and Software environment

  - This example runs on STM32F410xx devices.
    
  - This example has been tested with NUCLEO-F410RB RevC board and can be
    easily tailored to any other supported device and development board.
    
  - Connect a square waveform generator to PC.00 (pin 6 in CN8 connector).
    If the frequency of the signal is 1 kHz, LED2 toggles every second.

@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


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