/**
  @page TIM_TIM9OCToggle TIM TIM9 OC Toggle example
  
  @verbatim
  ******************** (C) COPYRIGHT 2013 STMicroelectronics *******************
  * @file    TIM/TIM_TIM9OCToggle/readme.txt 
  * @author  MCD Application Team
  * @version V1.3.0
  * @date    13-November-2013
  * @brief   Description of the TIM TIM9 OC Toggle 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 TIM9 peripheral to generate four different 
signals with Two different frequencies.

The TIM9CLK frequency is set to SystemCoreClock (Hz), and we want to get TIM9
counter clock at 15 MHz so the Prescaler is computed as following:
   - Prescaler = (TIM9CLK / TIM9 counter clock) - 1
   
SystemCoreClock is set to 168 MHz for STM32F4xx devices

The TIM9 CCR1 register value is equal to 40961: 
CC1 update rate = TIM9 counter clock / CCR1_Val = 366.2 Hz,
so the TIM9 Channel 1 generates a periodic signal with a frequency equal to 183.1 Hz.

The TIM9 CCR2 register is equal to 20480:
CC2 update rate = TIM9 counter clock / CCR2_Val = 732.4 Hz
so the TIM9 channel 2 generates a periodic signal with a frequency equal to 366.3 Hz.


@par Directory contents 
  
  - TIM/TIM_TIM9OCToggle/system_stm32f4xx.c   STM32F4xx system clock configuration file
  - TIM/TIM_TIM9OCToggle/stm32f4xx_conf.h     Library Configuration file
  - TIM/TIM_TIM9OCToggle/stm32f4xx_it.c       Interrupt handlers
  - TIM/TIM_TIM9OCToggle/stm32f4xx_it.h       Interrupt handlers header file
  - TIM/TIM_TIM9OCToggle/main.c               Main program


@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 TIM9 pins to an oscilloscope to monitor the different waveforms:
       - TIM9_CH1 (PA.02)
       - TIM9_CH2 (PA.03)
       

@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>
 */
