/**
  @page TIM_OnePulse TIM example
  
  @verbatim
  ******************** (C) COPYRIGHT 2016 STMicroelectronics *******************
  * @file    Examples_LL/TIM/TIM_OnePulse/readme.txt 
  * @author  MCD Application Team
  * @version V1.0.0
  * @date    14-April-2017
  * @brief   Description of the TIM_OnePulse example.
  ******************************************************************************
  *
  * Redistribution and use in source and binary forms, with or without modification,
  * are permitted provided that the following conditions are met:
  *   1. Redistributions of source code must retain the above copyright notice,
  *      this list of conditions and the following disclaimer.
  *   2. Redistributions in binary form must reproduce the above copyright notice,
  *      this list of conditions and the following disclaimer in the documentation
  *      and/or other materials provided with the distribution.
  *   3. Neither the name of STMicroelectronics nor the names of its contributors
  *      may be used to endorse or promote products derived from this software
  *      without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
  ******************************************************************************
  @endverbatim

@par Example Description

This example shows how to configure a timer to generate
a positive pulse in Output Compare mode with a length of
tPULSE and after a delay of tDELAY. This example is based
on the STM32F1xx TIM LL API. The peripheral
initialization is done using LL unitary services functions for
optimization purpose (performance and size).

The pulse is generated on OC1.

This example uses 2 timer instances:

  - TIM3 generates a positive pulse of 50 us after a delay of 50 us. User push-button
    is used to start TIM3 counter. 
                                              ___ 
                                             |   |
    User push-button ________________________|   |________________________________
                                                            ___________
                                                           |           |
    OC1              ______________________________________|           |________
    (TIM3_CH1)                                <---50 us---><---50 us--->
                                                |            |_ uwMeasuredPulseLength
                                                |_ uwMeasuredDelay

  TIM3_CH1 delay and pulse length are measured every time a pulse is generated. 
  Both can be observed through the debugger by monitoring the variables uwMeasuredDelay and
  uwMeasuredPulseLength respectively.

  - TIM2 generates a positive pulse of 3 s after a delay of 2 s. TIM2 counter start
    is controlled through the slave mode controller. TI2FP2 signals is selected as
    trigger input meaning that TIM2 counter starts when a rising edge is detected on
    TI2FP2. The TIM2 output channel is mapped on the pin PA.00.
                                  ___
                                 |   |
    TI2 _________________________|   |_________________________________________
    (TIM2_CH2)
                                               ___________________________
                                              |                           |
    OC1 ______________________________________|                           |____
    (TIM2_CH1)                   <-----2s-----><----------3 s------------->
   


Both TIM3 and TIM2 are configured to generate a single pulse (timer counter 
stops automatically at the next update event (UEV).

Connecting TIM3 OC1 to TIM2 TI2 allows to trigger TIM2 counter by pressing
the User push-button.

@par Directory contents 

  - TIM/TIM_OnePulse/Inc/stm32f1xx_it.h          Interrupt handlers header file
  - TIM/TIM_OnePulse/Inc/main.h                  Header for main.c module
  - TIM/TIM_OnePulse/Inc/stm32_assert.h          Template file to include assert_failed function
  - TIM/TIM_OnePulse/Src/stm32f1xx_it.c          Interrupt handlers
  - TIM/TIM_OnePulse/Src/main.c                  Main program
  - TIM/TIM_OnePulse/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:
      - TIM3_CH1  PA.06: connected to pin 5 of CN5 connector  
      - TIM2_CH1  PA.00: connected to pin 1 of CN8 connector 
      - TIM2_CH2  PA.01: connected to pin 2 of CN8 connector 

@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>&copy; COPYRIGHT STMicroelectronics</center></h3>
 */
