/**
  @page RTC_TimeStamp RTC Time Stamp example
  
  @verbatim
  ******************** (C) COPYRIGHT 2012 STMicroelectronics *******************
  * @file    RTC/TimeStamp/readme.txt 
  * @author  MCD Application Team
  * @version V1.1.1
  * @date    13-April-2012
  * @brief   Description of the RTC Time Stamp 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 provides a short description of how to use the RTC peripheral and 
the Time Stamp feature.

One from the following clock can be used as RTC clock source (uncomment the
corresponding define in main.c):
  - LSE oscillator clock usually delivered by a 32.768 kHz quartz.
  - LSI oscillator clock

The program behaves as follows:

1. After startup the user is asked to set the time and date (entered on HyperTerminal).

2. When an External Reset occurs the BKP domain is not reset and the RTC configuration
   is not lost.

3. When power on reset occurs, the BKP domain is reset and the RTC configuration is lost.

4. It configures the RTC_AF1 pin TimeStamp to be falling edge and enables the
TimeStamp detection.

5. On applying a low level on the RTC_AF1 pin (PC.13), the calendar is saved in 
the time-stamp registers thanks to the timestamp event detection.

   
The example uses HyperTerminal to configure the RTC clock, display the current 
time and timestamp registers contents:

 - When pressing Joystick SEL button, the current time and date are saved in RTC TSTR
   and TSDR registers.
 - When pressing Joystick UP button, the TimeStamp Calendar is cleared.
 - When pressing KEY push button, the current RTC Calendar (Time and date) and
   RTC TimeStamp Calendar (Time and date) are displayed.

@note  The RTC_Year member in the TimeStamp Date is always 00 (no years in the RTC_TSDR register)
 

@par Directory contents 

  - RTC/TimeStamp/stm32l1xx_conf.h    Library Configuration file
  - RTC/TimeStamp/stm32l1xx_it.c      Interrupt handlers
  - RTC/TimeStamp/stm32l1xx_it.h      Interrupt handlers header file
  - RTC/TimeStamp/main.c              Main program
  - RTC/TimeStamp/system_stm32l1xx.c  STM32L1xx system source file
  

@note The "system_stm32l1xx.c" is generated by an automatic clock configuration 
      system and can be easily customized to your own configuration. 
      To select different clock setup, use the "STM32L1xx_Clock_Configuration_V1.1.0.xls" 
      provided with the AN3309 package available on <a href="http://www.st.com/internet/mcu/family/141.jsp">  ST Microcontrollers </a>
         

@par Hardware and Software environment

  - This example runs on STM32L1xx Ultra Low Power High-, Medium-Density and Medium-Density Plus Devices.
  
  - This example has been tested with STMicroelectronics STM32L152D-EVAL (STM32L1xx 
    Ultra Low Power High-Density) and STM32L152-EVAL (STM32L1xx Ultra Low 
    Power Medium-Density) evaluation board and can be easily tailored to any 
    other supported device and development board.


  - STM32L152-EVAL Set-up
    - SEL button connected to PE.08 pin
    - Connect PC.13 to SEL buttons using a wire     
    - Use LED1 connected to PD.00 pin.
    - Use the KEY push button connected to PA.00 pin (EXTI Line0).
    - Use the Joystick UP button connected to PG.11 pin (EXTI Line09).
    - Connect a null-modem female/female RS232 cable between the DB9 connector 
      CN2 (USART2) and PC serial port to display data on the HyperTerminal.
    - LCD Glass pins is shared with USART2 via jumpers, so make sure that
         Jumper 7 (JP7) is in position 1<-->2.
         Jumper 8 (JP8) is in position 1<-->2.
     - Make sure that JP4 is in position (vdd) 1<->2.
  
  - STM32L152D-EVAL Set-up
    - SEL button connected to PG.13 pin.
    - Connect PC.13 to PG.13 pin using a wire.
    - Use LED1 led connected to PD.03 pin.
    - Use the KEY push button connected to PA.00 pin (EXTI Line0).
    - Use the Joystick UP button connected to PG.11 pin (EXTI Line11).
    - Connect a null-modem female/female RS232 cable between the DB9 connector 
      CN1 (USART1) and PC serial port to display data on the HyperTerminal.
    - Make sure that jumper JP4 is in position 2-3

    @note Make sure that the LCD glass module is mounted on “IO” position.

    @note Make sure that jumper JP10 is in (vdd) position.     
      
  - Hyperterminal configuration:
    - Word Length = 8 Bits
    - One Stop Bit
    - No parity
    - BaudRate = 115200 baud
    - flow control: None

@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\STM32L1xx_StdPeriph_Templates
 - Open your preferred toolchain 
 - Rebuild all files and load your image into target memory
 - Run the example

@note
- Ultra Low Power Medium-density devices are STM32L151xx and STM32L152xx 
  microcontrollers where the Flash memory density ranges between 64 and 128 Kbytes.
- Ultra Low Power Medium-density Plus devices are STM32L151xx, STM32L152xx and 
  STM32L162xx microcontrollers where the Flash memory density is 256 Kbytes.
- Ultra Low Power High-density devices are STM32L151xx, STM32L152xx and STM32L162xx 
  microcontrollers where the Flash memory density is 384 Kbytes.
    
 * <h3><center>&copy; COPYRIGHT STMicroelectronics</center></h3>
 */


