3. Create a "Hello world" application

This tutorial demonstrates how to create and launch your first application on your device using Eclipse and Digi plug-ins.

Before starting development for your ConnectCore platform, make sure your device is correctly connected, powered, and running. See Step 2: Set up the hardware and Step 3: Program the Yocto firmware.

Once your device is ready for development, follow these steps:

3.1. Create the project
3.2. Build the project
3.3. Launch the application

3.1. Create the project

Select File > New > Project to open the New Project wizard
Select C Project under the C/C++ category.
Click Next. The C Project wizard opens.

Type hello_world in the Project name text box.
In the Project type list, expand the Executable category.
Select the Hello World ANSI C Project.
Select DEY Cross GCC from the Toolchains list.
Click Finish to create the project.
The hello_world project appears in the Project Explorer view.

3.2. Build the project

Select the hello_world project in the Project Explorer view.
Click the Build Active Configuration toolbar button .
The build output appears in the Console view. The application binary is generated inside the Debug project directory.

3.3. Launch the application

Select the hello_world project in the Project Explorer view.
Right click and select Run As > DEY C/C++ Remote Application from the context menu. The Connection dialog opens.

Select a connection to your device:

Click New Connection. The New Connection wizard opens.
Select Generic Connection. Click Next.
Click Browse to look for devices. The Select Target dialog opens. It lists all the targets in the neighborhood with their corresponding IP.

How to find the IP of your device

Find the IP of your device with the ifconfig command:

root@ccimx6ulsbc:~# ifconfig
eth0      Link encap:Ethernet  HWaddr 00:40:9D:98:A6:37  
          UP BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)
 
eth1      Link encap:Ethernet  HWaddr 00:40:9D:98:A6:36  
          inet addr:192.168.42.30  Bcast:10.101.2.255  Mask:255.255.255.0
          inet6 addr: fe80::240:9dff:fe98:a636%lo/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:1360759 errors:0 dropped:0 overruns:0 frame:0
          TX packets:172594 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:163158464 (155.5 MiB)  TX bytes:29408643 (28.0 MiB)
 
lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1%1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:22 errors:0 dropped:0 overruns:0 frame:0
          TX packets:22 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1 
          RX bytes:1581 (1.5 KiB)  TX bytes:1581 (1.5 KiB)
 
wlan0     Link encap:Ethernet  HWaddr 00:40:9D:98:A6:38  
          UP BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)
 
wlan1     Link encap:Ethernet  HWaddr 02:03:7F:D7:00:01  
          inet addr:192.168.46.30  Bcast:192.168.46.255  Mask:255.255.255.0
          inet6 addr: fe80::3:7fff:fed7:1%lo/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:21770 errors:0 dropped:3 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:0 (0.0 B)  TX bytes:6312817 (6.0 MiB)

In this example, the target IP address is 192.168.42.30.

Note Your device and your host machine must be in the same network.

Select your device. Click OK.
You can also change the default connection name in the Connection Name text box.
Click Finish to create the connection.

Select the new created connection and click OK.
The application is automatically transferred to the device and executed.
When the application is launched, the Terminal view displays the "Hello world" message.

You have successfully created and executed a Hello World application in your ConnectCore device. Follow the next steps to create another application to interact with your hardware.