mpc5200btiny linux quickstart l-679e

phyCORE-MPC5200B tiny/IO QuickStart Instructions

3.5 Changing the Demo

Now we will extend the myHelloWorld application. The extended myHelloWorld application will write an output on the serial interface ttyPSC0 and the standard output.

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Open Eclipse if is not opened yet.

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Double-Click HelloWorld.c in the myHelloWorld project.

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First include two additional header files:

#include <unistd.h>

#include <fcntl.h>

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Then add the function write_tty to write n bytes to the serial interface /dev/ttyPSC0.

void write_tty(char *buffer, int count)

{

int out;

out=open("/dev/ttyPSC0",O_RDWR);

write(out,buffer,count);

close(out);

}

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Enter the following two lines in the main function to declare the buffer und call the write_ttyS0() function.

char buf[]={"Welcome to the World of the phyCORE-

MPC5200

(ttyPSC0)\n"}; write_tty(buf,sizeof(buf)-1);

On the next screenshot you can see the complete program.

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© PHYTEC Messtechnik GmbH 2007 L-679e_5

Getting More Involved

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Save your program after changing the code.

The Application will be compiled, built, copied to the target and executed.

Executing the program on the target with Komport:

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Click on the Komport icon on the desktop

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If your are not logged in, enter root and press enter.

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Type ./myHelloWorld to start the application.

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You will see the following output:

Welcome to the world of the phyCORE-MPC5200! (ttyPSC0)

Welcome to the world of the phyCORE-MPC5200!

© PHYTEC Messtechnik GmbH 2006 L-679e_5

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