Advantech RSB-4221, User Manual

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57 RSB-4221 User Manual
Chapter 4
LinuxBSP
4.9 development guide and reference
4.9.1 Development of C/C++ Programs
This section will guide you how to write a sample application “Hello World”. You can
refer to the following steps:
1. Open "Terminal" on Ubuntu 12.04 LTS and Change to “root”:
Type user password.
2. Create the develop environment using flowing command:
3. Edit the helloworld.c with the following source code:
#include <stdio.h>
void main()
{
printf("Hello World!\n");
}
Save the file and exit.
4. Compile helloworld.c using flowing command:
Then you can see “helloworld” in current directory.
5. Run the executable file helloworld on the RSB-4221.
Insert the Linux system SD card into your development computer.
Note. /media/rootfs is the mounted point of your Linux system SD card
Remove this SD card and insert it to RSB-4221, then open serial console.
On RSB-4221 platform, type #root (Login)
On RSB-4221 platform, type #cd /tool
On RSB-4221 platform, type #./helloworld
Now you should be able to see “Hello World!” shown on RSB-4221.
4.9.2 Development of GUI Programs with QT Library
With the development kit, you can develop a qt-based GUI program. Follow these
steps, you can quickly convert your QT Project to a GUI application for RSB-4221:
1. On your host PC, set up QT Build Environment
$ sudo su
#source /usr/local/cross_compiler/linux-devkit/environment-
setup
# cd /root//4221LBVxxxx_yyyy_mm_dd/source
# mkdirhelloworld
# cd helloworld
# gedithellowrold.c
# $CC -o helloworld helloworld.c
# cp helloworld /media/rootfs/tool
#source /usr/local/cross_compiler/linux-devkit/environment-
setup