Update Compiling_STM32.md

docs/Compiling_STM32.md

@@ -35,9 +35,20 @@ Flashing precompiled **binaries** is done very simple with the cable setup prese
 
 1. In order to compile successfully you need also to modify a maple library file. In ```....\hardware\Arduino_STM32\STM32F1\cores\maple\libmaple\usart_f1.c``` comment out the 2 functions as shown below. This is required to have low-level access to the USART interrupt. 
 
- > ```//void __irq_usart2(void) { usart_irq(&usart2_rb, USART2_BASE); } ``` 
+/*
+void __irq_usart2(void) 
+ 
+{ usart_irq(&usart2_rb, USART2_BASE);
+
+}
+ 
+ void __irq_usart3(void) {
+ 
+ usart_irq(&usart3_rb, USART3_BASE);
+ 
+ } 
+ */ 
  
- > ```//void __irq_usart3(void) { usart_irq(&usart3_rb, USART3_BASE); } ``` 
  
 1. Run the IDE, and on the **Tools** menu, select **Board** and then **Boards manager**. Click on the Arduino DUE (32 Bits ARM-Cortex M3) from the list of available boards. You must do this step, it installs the arm-none-eabi-g++ toolchain!
 1. Close and reopen the Arduino IDE and load the Multiprotocol project.