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+/******************** (C) COPYRIGHT 2008 STMicroelectronics ********************
+* File Name          : readme.txt
+* Author             : MCD Application Team
+* Version            : V2.0.1
+* Date               : 06/13/2008
+* Description        : Description of the NVIC Priority 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.
+*******************************************************************************/
+
+Example description
+===================
+This example demontrates the use of the Nested Vectored Interrupt Controller (NVIC): 
+
+- Configuration of 2 EXTI Lines (Wakeup button EXTI Line & Key button EXTI Line)
+  to generate an interrupt on each falling edge and use the SysTick interrupt.
+- These interrupts are configured with the following parameters:
+  Wakeup button EXTI Line: o PreemptionPriority = PreemptionPriorityValue
+                           o SubPriority = 0
+  Key button EXTI Line:    o PreemptionPriority = 0
+                           o SubPriority = 1           
+  SysTick Handler: o PreemptionPriority = !PreemptionPriorityValue
+                   o SubPriority = 0             
+First, the PreemptionPriorityValue is equal to 0, the Wakeup button EXTI Line 
+has higher preemption priority than the SysTick handler. 
+
+In the key button EXTI Line interrupt routine the Wakeup button EXTI Line and 
+SysTick preemption priorities are inverted. 
+In the Wakeup button EXTI Line interrupt routine the pending bit of the SysTick 
+interrupt is set this will cause SysTick ISR to preempt the Wakeup button EXTI 
+Line ISR only if it has higher preemption priority.
+
+The system behaves as following: 
+1) The first time Key button EXTI Line interrupt occurs the SysTick preemption 
+become higher than Wakeup button EXTI Line one. So when the Wakeup button EXTI 
+Line interrupt occurs, the SysTick ISR is executed and the PreemptionOccured 
+variable become TRUE and the four leds (LD1, LD2, LD3, LD4) start toggling.
+
+2) When the next Key button EXTI Line interrupt occurs the SysTick preemption
+become lower than Wakeup button EXTI Line one. So when the Wakeup button EXTI Line
+interrupt occurs, the PreemptionOccured variable became FALSE and the four leds
+(LD1, LD2, LD3, LD4) stop toggling.
+
+Then this behavior is repeated from point 1) in an infinite loop.
+
+
+Directory contents
+==================
+platform_config.h    Evaluation board specific configuration file
+stm32f10x_conf.h     Library Configuration file
+stm32f10x_it.c       Interrupt handlers
+stm32f10x_it.h       Interrupt handlers header file
+main.c               Main program
+
+
+Hardware environment
+====================
+This example runs on STMicroelectronics STM3210B-EVAL and STM3210E-EVAL evaluation
+boards and can be easily tailored to any other hardware.
+To select the STMicroelectronics evaluation board used to run the example, uncomment
+the corresponding line in platform_config.h file.
+
+ + STM3210B-EVAL 
+    - Use LD1, LD2, LD3 and LD4 leds connected respectively to PC.06, PC.07, PC.08
+      and PC.09 pins
+    - Use the Key push-button connected to pin PB.09 (EXTI Line9).
+    - Use the Wakeup push-button connected to pin PA.00 (EXTI Line0).         
+ 
+ + STM3210E-EVAL
+    - Use LD1, LD2, LD3 and LD4 leds connected respectively to PF.06, PF0.7, PF.08
+      and PF.09 pins
+    - Use the Key push-button connected to pin PG.08 (EXTI Line8).
+    - Use the Wakeup push-button connected to pin PA.00 (EXTI Line0).
+ 
+    
+How to use it
+=============
+In order to make the program work, you must do the following :
+- Create a project and setup all your toolchain's start-up files
+- Compile the directory content files and required Library files :
+  + stm32f10x_lib.c
+  + stm32f10x_exti.c
+  + stm32f10x_gpio.c
+  + stm32f10x_rcc.c
+  + stm32f10x_nvic.c
+  + stm32f10x_flash.c
+    
+- Link all compiled files and load your image into target memory
+- Run the example
+
+
+******************* (C) COPYRIGHT 2008 STMicroelectronics *****END OF FILE******