GPIO-Usage-&-Used-Pins.md

-### Usage
+### Code implementation
 
+To use a pin in your board you can simply:
 ```cpp
 typedef <GPIOA, 9> somePin; //Define pin PA9 as somePin
 ```
@@ -65,3 +66,11 @@ Where are the stm32 pins which are used in miosix? (all paths are referred to `/
    | SERVO1  | SERVO2  | SERVO3   |   SERVO4 |
    |---------|---------|----------|----------|
    | PB6     | PB7     | PB8      | PB9      |
+
+Extra
+---------------
+
+### STM32F429ZI Discovery Pins
+
+![alt-img](https://os.mbed.com/media/uploads/bcostm/disco_f429zi_2017-07-25_slide1.png)
+![alt-img](https://os.mbed.com/media/uploads/bcostm/disco_f429zi_2017-07-25_slide2.png)
\ No newline at end of file