ARM9 S3C2440 -- Tutorial - 1

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here, first we have to read S3C2440A datasheet.. link is

http://www.ziddu.com/download/18096491/s3c2440a_um_rev014_040712.pdf.html

Each port has configuration for selection port action such as input , output, pin functionality,reserved..

In this mini2440 development board , four led is connected to GPB^5,GPB^4,GPB^6,GPB^5

here,  i have done simple blinking via loading inverting data ,

#include <S3C2440.h>  
int main (void)
{
    int i;                
    GPBCON |= 0X155555;
    GPBDAT |= 0X000007FF;        
    while (1)
    {
        GPBDAT |= 0X000007ff;
        for (i = 0; i < 200000; i++);
        GPBDAT &= ~0X000007ff;
        for (i = 0; i < 200000; i++);
    }
}

i have attached that source code link ::

http://www.ziddu.com/download/18096659/Test.rar.html

that code work as in KEIL compiler..

under this development board this code only working in NOR mode only..Using command 'd' in BIOS setting..