Goal

This tutorial will show you how to use the cross-compile chain provided by the preinstalled SDK on the virtual machine.

This tutorial will only use the command line and not any IDE.

Preconditions

The PHYTEC VM is on the host system and boots correctly:Get the Phytec VM and start it

Tutorial

The Hello World Program in C

The following small program is a standard Hello World program written in C:

Simple hello World program

#include <stdio.h>

int main ()
{
	printf("Hello World.\n");
	return 0;
}

Feel free to copy the content into a file.

For this tutorial, we will use a file named hello.c located in a folder named "test". This folder is created on the desktop of the user phyvm in the virtual machine.

Create the Folder and the File

Create folder and file

$ cd Desktop
$ mkdir test
$ cd test
$ touch hello.c
$ cat > hello.c << EOF
#include <stdio.h>

int main ()
{
	printf("Hello World.\n");
	return 0;
}

EOF

If the code above is done correctly, you can see that you have navigated to the "test" folder and created a file with the contents of the hello-world program shown above.

Compile the File for the Host

This step is optional and is only used to see if there are any errors in the hello.c file.

Compile for host

$ gcc hello.c -o hello

If there are no errors displayed by this command, everything is correctly compiled into a runnable program for the virtual machine.

Warning

The output of the compiler is only for this processor architecture and cannot be started on the board.

Start the compiled program

$ ./hello
# the output should be: Hello World and the prompt should be shown in a new line

If everything is correct, you can delete the compiled file from the virtual machine.

Delete file

$ rm hello # This command will delete the compiled program, be sure that you will not delete the hello.c file

Use the Preinstalled SDK to Compile the File for the Board

Open a new terminal

You will need to add the SDK to our environment

Add SDK to environment

$ source /opt/environment-setup-* # this command will source the sdk to the actual environment
# e.g.: source /opt/environment-setup-cortexa53-crypto-phytec-linux
$ echo ${CC} 
# expected output: 
# aarch64-phytec-linux-gcc -mcpu=cortex-a53 -march=armv8-a+crc+crypto -fstack-protector-strong -O2 -D_FORTIFY_SOURCE=2 -Wformat -Wformat-security -Werror=format-security --sysroot=/opt/sysroots/cortexa53-crypto-phytec-linux

Navigate to the desktop/test folder:
navigate and compile
```
$ cd /home/phyvm/Desktop/test
$ ${CC} hello.c -o hello-board
```
If the command does not create any errors, the program is compiled for the board.
Now you can copy the "hello_board" file to the board via SCP and run it there (Copy Software to the Board via SSH and SCP)

Compile a C program for the board using SDK