/**
  @page NVIC_IRQ_Channels NVIC_IRQ_Channels
  
  @verbatim
  ******************** (C) COPYRIGHT 2009 STMicroelectronics *******************
  * @file    NVIC/IRQ_Channels/readme.txt 
  * @author  MCD Application Team
  * @version V3.1.2
  * @date    09/28/2009
  * @brief   Description of the NVIC IRQ Channels Example.
  ******************************************************************************
  * THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
  * WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE
  * TIME. AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY
  * DIRECT, INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING
  * FROM THE CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE
  * CODING INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
  ******************************************************************************
   @endverbatim

@par Example Description 

This example demontrates the use of the Nested Vectored Interrupt Controller (NVIC)
IRQ Channels configuration: 

- Configuration of 3 TIM (TIM2..TIM4)timers to generate an interrupt on each 
  counter update event.
- The three timers are linked to their correspondant Update IRQ channel.
- Assignment of a ascendant IRQ priority for each IRQ channel :
  TIM2 has a preemption priority of 0 and TIM4 has a preemption priority of 2.
- In each interrupt routine: 
   - TIM2 toggles a LED1 each 1s 
   - TIM3 toggles a LED2 each 2s 
   - TIM4 toggles a LED3 each 3s 

@par Directory contents 

  - NVIC/IRQ_Channels/stm32f10x_conf.h  Library Configuration file
  - NVIC/IRQ_Channels/stm32f10x_it.c    Interrupt handlers
  - NVIC/IRQ_Channels/stm32f10x_it.h    Interrupt handlers header file
  - NVIC/IRQ_Channels/main.c            Main program

@par Hardware and Software environment 

  - This example runs on STM32F10x Connectivity line, High-Density, Medium-Density 
    and Low-Density Devices.
  
  - This example has been tested with STMicroelectronics STM3210C-EVAL (STM32F10x 
    Connectivity line), STM3210E-EVAL (STM32F10x High-Density) and STM3210B-EVAL
    (STM32F10x Medium-Density) evaluation boards and can be easily tailored to
    any other supported device and development board.
    To select the STMicroelectronics evaluation board used to run the example, 
    uncomment the corresponding line in stm32_eval.h file (under Utilities\STM32_EVAL)

  - STM3210C-EVAL Set-up 
    - Use LED1, LED2 and LED3 connected respectively to PD.07, PD.13 and PF.03 
      pins
    
  - STM3210E-EVAL Set-up 
    - Use LED1, LED2 and LED3 leds connected respectively to PF.06, PF0.7 and PF.08

  - STM3210B-EVAL Set-up  
    - Use LED1, LED2 and LED3 leds connected respectively to PC.06, PC.07 and PC.08
 
@par How to use it ? 

In order to make the program work, you must do the following :
- Create a project and setup all project configuration
- Add the required Library files :
  - stm32f10x_gpio.c 
  - stm32f10x_rcc.c 
  - stm32f10x_exti.c  
  - misc.c 
  - stm32f10x_tim.c 
  - stm32f10x_usart.c
  - system_stm32f10x.c (under Libraries\CMSIS\Core\CM3)
  - stm32_eval.c (under Utilities\STM32_EVAL)
    
- Edit stm32f10x.h file to select the device you are working on.
- Edit stm32_eval.h file to select the evaluation board you will use.
  
@b Tip: You can tailor the provided project template to run this example, for 
        more details please refer to "stm32f10x_stdperiph_lib_um.chm" user 
        manual; select "Peripheral Examples" then follow the instructions 
        provided in "How to proceed" section.   
- Link all compiled files and load your image into target memory
- Run the example

@note
 - Low-density devices are STM32F101xx and STM32F103xx microcontrollers where
   the Flash memory density ranges between 16 and 32 Kbytes.
 - Medium-density devices are STM32F101xx and STM32F103xx microcontrollers where
   the Flash memory density ranges between 32 and 128 Kbytes.
 - High-density devices are STM32F101xx and STM32F103xx microcontrollers where
   the Flash memory density ranges between 256 and 512 Kbytes.
 - Connectivity line devices are STM32F105xx and STM32F107xx microcontrollers.
    
 * <h3><center>&copy; COPYRIGHT 2009 STMicroelectronics</center></h3>
 */
