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Appendix
Sample Code
Included in the ‘/opt/samples/ directory are several files that show just some of the features
available with the dimmPCI platform. The first sample application is a simple hello world pro-
gram. Its sole purpose is to display a line of text that says “Hello World!” Basically it verifies
that your compiler tools and development environment are functioning properly.
// hello.c
//
// A very simple program to demonstrate that the development
// environment is properly configured
#include <stdio.h>
void main() {
printf(“Hello World!\n”);
}
The next sample application demonstrates how file I/O works in a GCC/Linux environment. This
program will create a file and write “Hello World!” to it. If you do not have the JFFS functioning
you can alternately create a file in the /var directory, since that is also writable.
// fileio.c
//
// A program to verify that the flash filesystem works
// properly.
// Upon completion a new file will be created /usr/hello_world
// that contains the text “Hello World!”
#include <stdio.h>
void main ()
{
FILE *file_handle;
// create and open the file
file_handle = fopen (“/usr/hello_world”, “w+”);
// check if an error occured
if (file_handle == NULL) {
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