Step 4 : Compile and Run
========================

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   .. tab-item:: Compile and Run

        * In this program, you are going to learn


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                * How to ?


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        Topics in this section,

                * :ref:`Steps for Compilation and Run <Rt-Thread_qemu_ARM-vexpress-A9_step3_0>`


.. _Rt-Thread_qemu_ARM-vexpress-A9_step3_0:

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   .. tab-item:: Steps for Compilation and Run

        * Perform compilation using below command:

        .. code-block:: c
            
                $ scons

        * Note: For clean compilation, you can use following command:

        .. code-block:: c

                $ scons --clean

        * If the compilation is correct, the "rtthread.elf" file will be generated in the BSP directory, which is a target file required for QEMU to run.

        .. code-block:: c

                qemu-vexpress-a9$ ls -lrt rtthread.elf 
	            -rwxrwxr-x 1 test test 1866252 Apr 12 16:40 rtthread.elf

        * Use the ./qemu.sh command to run the Project.

        .. code-block:: c

                $ ./qemu.sh
                
        * The above command will start the virtual machine and BSP project.

        * The initialization information is displayed and version number information is printed during the start-up of RT-Thread system. 
          
        * The QEMU virtual machine also starts running as shown below:

        .. code-block:: c

                test:qemu-vexpress-a9$ ./qemu.sh
	            QEMU emulator version 6.2.0 (Debian 1:6.2+dfsg-2ubuntu6.18)
	            Copyright (c) 2003-2021 Fabrice Bellard and the QEMU Project developers

            	  | 
            	- RT -     Thread Operating System
            	  |      5.1.0 build Apr 12 2024 16:40:27
            	 2006 - 2024 Copyright by RT-Thread team
            	[I/SDIO] SD card capacity 65536 KB.
            	[I/FileSystem] file system initialization done!

            	Hello RT-Thread!
            	msh />

        * Enter below command to check the list of commands which can be used:

        .. code-block:: c

                msh />help

        * Run "ls" command to list the contents as shown below:

        .. code-block:: c

                msh />ls
                Directory /:
                dev                 <DIR>

        * Now run below commands to print "hello RT-Thread":

        .. code-block:: c
                
                msh />echo "hello RT-Thread" hello.txt

                msh />ls
                Directory /:
                dev                 <DIR>
                hello.txt           15

                msh />cat hello.txt
                hello RT-thread


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