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I need an example to understand NVIC with stm32f4-Discovery

Question asked by ashraf.salahuddin on Apr 9, 2014
Latest reply on Apr 10, 2014 by Clive One
Hi guys
I'm trying to understand NVIC with STM32F4-Discovery, I've read the user manual and programming manual (the partition related with NVIC and Exceptions) and I've searched the web for a full simple example that help me understanding
-how NVIC works
-how to write a simple handler
-what is the difference between event and interrupt 
-what is the difference between NVIC and EXTI ?

either I found a complex example with USART for example, or a snippet of code, not full one
I hope some example, with comments wherever possible, that toggle LEDs to make it clearer for me

I hope I'm not asking too much.. thanks in advance