GPIO-Usage-&-Used-Pins.md

@@ -3,7 +3,7 @@ A GPIO is a software-controllable peripheral used to configure the device IO por
 GPIOs are grouped in ports and so each GPIO has an identifier.  
 The identifiers have the following format: PXY, where X is the port name and Y is the pin number.
 
-### Configuration
+## Configuration
 > :warning: **WARNING: Before using a GPIO it has to be correctly configured. A lot of times you can experience non-working code or drivers due to not initialized or configured GPIOs.**  
   
 Examples of possible configurations for a GPIO are:
@@ -18,7 +18,7 @@ The available pin modes and speeds can be found in the
   
 If you want to know more about GPIOs, check out the [GPIO Tutorial - Miosix Wiki](https://miosix.org/wiki/index.php?title=GPIO_tutorial) page.
 
-### Examples
+## Examples
 
 #### 1. Template API
 To use a pin in your board you can simply do:
@@ -69,7 +69,7 @@ somePin.alternateFunction(5);
 > }
 > ```
 
-### Discovery Board Pins
+## Discovery Board Pins
 These are some commonly used pins that you'll need when writing software for **Discovery boards**.
 
 - STM32F429ZI_DISCO
@@ -95,7 +95,7 @@ You can find a complete pin usage description
 
 You can find more in the [datasheet](http://www.st.com/content/ccc/resource/technical/document/user_manual/70/fe/4a/3f/e7/e1/4f/7d/DM00039084.pdf/files/DM00039084.pdf/jcr:content/translations/en.DM00039084.pdf) for more.
 
-### Miosix Used Pins
+## Miosix Used Pins
 These are some pins that are used by default from the kernel when running on **STM32 micros** (all paths are referred to `/libs/miosix-kernel/miosix`):
 
 - SD memory: `arch/common/drivers/sd_stm32f2_f4.cpp`
@@ -121,7 +121,7 @@ These are some pins that are used by default from the kernel when running on **S
 Extra
 ---------------
 
-### STM32F429ZI Discovery Pins
+## 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)
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