/**
  @page TIM_6Steps TIM 6 Steps example
  
  @verbatim
  ******************** (C) COPYRIGHT 2013 STMicroelectronics *******************
  * @file    TIM/TIM_6Steps/readme.txt 
  * @author  MCD Application Team
  * @version V1.3.0
  * @date    13-November-2013
  * @brief   Description of the TIM 6 Steps example.
  ******************************************************************************
  *
  * Licensed under MCD-ST Liberty SW License Agreement V2, (the "License");
  * You may not use this file except in compliance with the License.
  * You may obtain a copy of the License at:
  *
  *        http://www.st.com/software_license_agreement_liberty_v2
  *
  * Unless required by applicable law or agreed to in writing, software 
  * distributed under the License is distributed on an "AS IS" BASIS, 
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  *
  ******************************************************************************
  @endverbatim

@par Example Description 

This example shows how to configure the TIM1 peripheral to generate 6 Steps.
The STM32F4xx 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 100 ms: using the SysTick 
interrupt.

In order to have a software COM event generated each 100 ms using Systick, the 
SystemCoreClock must be 168 Mhz.

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

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   |   0   |   0   |   0   |   0   |   1   |
   ----------------------------------------------------------
  |Channel1N |   0   |   0   |   1   |   1   |   0   |   0   |
   ----------------------------------------------------------
  |Channel2  |   0   |   0   |   0   |   1   |   1   |   0   |
   ----------------------------------------------------------
  |Channel2N |   1   |   1   |   0   |   0   |   0   |   0   |
   ----------------------------------------------------------
  |Channel3  |   0   |   1   |   1   |   0   |   0   |   0   |
   ----------------------------------------------------------
  |Channel3N |   0   |   0   |   0   |   0   |   1   |   1   |
   ----------------------------------------------------------
@endverbatim


@par Directory contents 
  
  - TIM/TIM_6Steps/system_stm32f4xx.c   STM32F4xx system clock configuration file
  - TIM/TIM_6Steps/stm32f4xx_conf.h     Library Configuration file
  - TIM/TIM_6Steps/stm32f4xx_it.c       Interrupt handlers
  - TIM/TIM_6Steps/stm32f4xx_it.h       Interrupt handlers header file
  - TIM/TIM_6Steps/main.c               Main program
  - TIM/TIM_6Steps/main.h               Main program header file


@par Hardware and Software environment 

  - This example runs on STM32F405xx/407xx, STM32F415xx/417xx, STM32F427xx/437xx and 
    STM32F429xx/439xx devices.
    
  - This example has been tested with STMicroelectronics STM324xG-EVAL (STM32F40xx/
    STM32F41xx Devices), STM32437I-EVAL (STM32F427xx/STM32F437xx Devices) and 
    STM324x9I-EVAL RevB (STM32F429xx/STM32F439xx Devices) evaluation boards and 
    can be easily tailored to any other supported device and development board.   

  - STM324xG-EVAL/STM32437I-EVAL and STM324x9I-EVAL RevB Set-up 
    - Connect the TIM1 pins to an oscilloscope to monitor the different waveforms:
      - TIM1_CH3  (PA.10)
      - TIM1_CH1N (PB.13)  
      - TIM1_CH2  (PE.11)  
      - TIM1_CH3N (PB.15)
      - TIM1_CH1  (PA.08)  
      - TIM1_CH2N (PB.14)    
    - 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:
 - Copy all source files from this example folder to the template folder under
   Project\STM32F4xx_StdPeriph_Templates
 - Open your preferred toolchain 
 - Select the project workspace related to the used device 
   - If "STM32F40_41xxx" is selected as default project Add the following files in the project source list:
     - Utilities\STM32_EVAL\STM3240_41_G_EVAL\stm324xg_eval.c
           
   - If "STM32F427_437xx" is selected as default project Add the following files in the project source list:
     - Utilities\STM32_EVAL\STM324x7I_EVAL\stm324x7i_eval.c
          
   - If "STM32F429_439xx" is selected as default project Add the following files in the project source list:
     - Utilities\STM32_EVAL\STM324x9I_EVAL\stm324x9i_eval.c
                 
 - Rebuild all files and load your image into target memory
 - Run the example
   
 * <h3><center>&copy; COPYRIGHT STMicroelectronics</center></h3>
 */
