STM32CubeF4

/**
  @page TIM_6steps Timers Synchronization example
  
  @verbatim
  ******************** (C) COPYRIGHT 2017 STMicroelectronics *******************
  * @file    TIM/TIM_6steps/readme.txt 
  * @author  MCD Application Team
  * @brief   Description of the TIM 6 Steps 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 shows how to configure the TIM1 peripheral to generate 6 Steps.
The STM32F446xx TIM1 peripheral offers the possibility to program in advance the 
configuration for the next TIM1 outputs behaviour (step) and change the configuration
of all the channels at the same time. This operation is possible when the COM 
(commutation) event is used.

The COM event can be generated by software by setting the COM bit in the TIM1_EGR
register or by hardware (on TRC rising edge).
In this example, a software COM event is generated each 1 ms: using the SysTick 
interrupt.

The TIM1 is configured in Timing Mode, each time a COM event occurs, a new TIM1
configuration will be set in advance. Only changed states are programmed. 

The break Polarity is used at High level.

The following Table describes the TIM1 Channels states:

@verbatim
                     -----------------------------------------------
                    | Step1 | Step2 | Step3 | Step4 | Step5 | Step6 |
          ----------------------------------------------------------
         |Channel1  | 1(PWM)|   0   |   0   |   0   |   0   |1(PWM) |
          ----------------------------------------------------------
         |Channel1N |   0   |   0   |1(PWM) |1(PWM) |   0   |   0   |
          ----------------------------------------------------------
         |Channel2  |   0   |   0   |   0   |1(PWM) |1(PWM) |   0   |
          ----------------------------------------------------------
         |Channel2N |1(PWM) |1(PWM) |   0   |   0   |   0   |   0   |
          ----------------------------------------------------------
         |Channel3  |   0   |1(PWM) |1(PWM) |   0   |   0   |   0   |
          ----------------------------------------------------------
         |Channel3N |   0   |   0   |   0   |   0   |1(PWM) |1(PWM) |
          -----------------------------------------------------------
   
   
 Channel1  (PA.08)   |||||||_________________________________||||||||||||||_________________________________|||||||
 Channel1N (PB.13)   _______________||||||||||||||||_______________________________||||||||||||||||________________
                                                    
 Channel2  (PA.09)   _______________________||||||||||||||||_______________________________||||||||||||||||________
 Channel2N (PB.14)   |||||||||||||||________________________________|||||||||||||||________________________________
                                                    
 Channel3  (PA.10)   _______||||||||||||||||_______________________________||||||||||||||||________________________
 Channel3N (PB.15)   ________________________________|||||||||||||||________________________________|||||||||||||||
   
@endverbatim

@par Keywords

Timers, 6 steps, PWM, Duty Cycle, Waveform, Oscilloscope, Output, Signal, commutation, timing mode

@par Directory contents 

  - TIM/TIM_6steps/Inc/stm32f4xx_hal_conf.h    HAL configuration file
  - TIM/TIM_6steps/Inc/stm32f4xx_it.h          Interrupt handlers header file
  - TIM/TIM_6steps/Inc/main.h                  Header for main.c module  
  - TIM/TIM_6steps/Src/stm32f4xx_it.c          Interrupt handlers
  - TIM/TIM_6steps/Src/main.c                  Main program
  - TIM/TIM_6steps/Src/stm32f4xx_hal_msp.c     HAL MSP file
  - TIM/TIM_6steps/Src/system_stm32f4xx.c      STM32F4xx system source file

@par Hardware and Software environment

  - This example runs on STM32F446xx devices.
    
  - This example has been tested with STM32446E-EVAL board and can be
    easily tailored to any other supported device and development board.      

  - STM32446E-EVAL Set-up
   Connect the following pins to an oscilloscope to monitor the different waveforms:
      - TIM1_CH1  pin  PA.08(pin 1 in CN6 connector)  
      - TIM1_CH1N pin  PB.13  
      - TIM1_CH2  pin  PA.09   
      - TIM1_CH2N pin  PB.14(Pin 7 in CN6 connector)   
      - TIM1_CH3  pin  PA.10  
      - TIM1_CH3N pin  PB.15(pin 5 in CN6 connector)

    - Connect the TIM1 break pin TIM1_BKIN pin (PB.12) to the GND. To generate a 
      break event, switch this pin level from 0V to 3.3V.  


@par How to use it ? 

In order to make the program work, you must do the following :
 - Open your preferred toolchain
 - Rebuild all files: Project->Rebuild all
 - Load project image: Project->Download and Debug
 - Run program: Debug->Go(F5) 


 */