STM32CubeF3

/**
  @page TIM_OCActive TIM_OCActive example
  
  @verbatim
  ******************** (C) COPYRIGHT 2016 STMicroelectronics *******************
  * @file    TIM/TIM_OCActive/readme.txt 
  * @author  MCD Application Team
  * @brief   This example shows how to configure the Timer to generate four 
  *          delayed signals.
  ******************************************************************************
  *
  * 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
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  * 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 the TIM peripheral in Output Compare Active 
  mode (when the counter matches the capture/compare register, the concerned output
  pin is set to its active state).

  The TIM1 frequency is set to SystemCoreClock, and the objective is
  to get TIM1 counter clock at 10 kHz so the Prescaler is computed as following:
     - Prescaler = (TIM1CLK /TIM1 counter clock) - 1
   
  SystemCoreClock is set to 64 MHz for STM32F3xx Devices.

  The TIM1 CCR1 register value is equal to 10000:
  TIM1_CH1 delay = CCR1_Val/TIM1 counter clock  = 1s
  so the TIM1 Channel 1 generates a signal with a delay equal to 1s.

  The TIM1 CCR2 register value is equal to 5000:
  TIM1_CH2 delay = CCR2_Val/TIM1 counter clock = 500 ms
  so the TIM1 Channel 2 generates a signal with a delay equal to 500 ms.

  The TIM1 CCR3 register value is equal to 2500:
  TIM1_CH3 delay = CCR3_Val/TIM1 counter clock = 250 ms
  so the TIM1 Channel 3 generates a signal with a delay equal to 250 ms.

  The TIM1 CCR4 register value is equal to 1250:
  TIM1_CH4 delay = CCR4_Val/TIM1 counter clock = 125 ms
  so the TIM1 Channel 4 generates a signal with a delay equal to 125 ms.

  The delay correspond to the time difference between PB.00 rising edge and
  TIM1_CHx signal rising edges.
  STM32 board LED can be used to monitor the example status:
  - LED1 turns ON if example is OK.
  - LED2 toggles slowly in case of error.   


@note Delay values mentioned above are theoretical (obtained when the system clock frequency 
      is exactly 64 MHz). Since the generated system clock frequency may vary from one board to another observed
      delay might be slightly different.
	  
@note Care must be taken when using HAL_Delay(), this function provides accurate delay (in milliseconds)
      based on variable incremented in SysTick ISR. This implies that if HAL_Delay() is called from
      a peripheral ISR process, then the SysTick interrupt must have higher priority (numerically lower)
      than the peripheral interrupt. Otherwise the caller ISR process will be blocked.
      To change the SysTick interrupt priority you have to use HAL_NVIC_SetPriority() function.
      
@note The application need to ensure that the SysTick time base is always set to 1 millisecond
      to have correct HAL operation.


@par Directory contents 

  - TIM/TIM_OCActive/Inc/stm32f3xx_hal_conf.h    HAL configuration file
  - TIM/TIM_OCActive/Inc/stm32f3xx_it.h          Interrupt handlers header file
  - TIM/TIM_OCActive/Inc/main.h                  Header for main.c module  
  - TIM/TIM_OCActive/Src/stm32f3xx_it.c          Interrupt handlers
  - TIM/TIM_OCActive/Src/main.c                  Main program
  - TIM/TIM_OCActive/Src/stm32f3xx_hal_msp.c     HAL MSP file
  - TIM/TIM_OCActive/Src/system_stm32f3xx.c      STM32F3xx system source file


@par Hardware and Software environment

  - This example runs on STM32F303ZE devices.
    
  - This example has been tested with STMicroelectronics STM32F303ZE-Nucleo Rev B 
    board and can be easily tailored to any other supported device 
    and development board.      

  - STM32F303ZE-Nucleo Rev B Set-up
   Connect the following pins to an oscilloscope to monitor the different waveforms:
      - Use LED1 connected to PB.00 (Reference) (connected to pin 31 on CN10 Connector)
      - PE.09: (TIM1_CH1) (Arduino D6 - connected to pin 4 on CN10 Connector)
      - PE.11: (TIM1_CH2) (Arduino D5 - connected to pin 6 on CN10 Connector)
      - PE.13: (TIM1_CH3) (Arduino D3 - connected to pin 10 on CN10 Connector)
      - PE.14: (TIM1_CH4) (connected to pin 28 on CN10 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>
 */