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program error

vishal verma

hi

i am using arm 9 board(samsung s3c2440), and i am doing the simple program to recognize user button from user led . actually there is no error in this program but this program is not working properly....." #include "def.h"
#include "2440addr.h"

void delay(int x)
{ int i,j;
for(i=0;i<=x;i++) {
for(j=0;j<=x;j++) {}}

}

int main (void)
{ rGPGCON=0x000000; rGPGUP=0x000000; rGPBCON=0X0015400; rGPBUP=0x000000;

while(1)
{ while((rGPGDAT)&(0x0800)==0x0800) {rGPBDAT=~0x020;} while((rGPGDAT)&(0x080)==0x080) {rGPBDAT=~0x040;} while((rGPGDAT)&(0x040)==0x040) {rGPBDAT=~0x080;} while((rGPGDAT)&(0x020)==0x020) {rGPBDAT=~0x100;}

}

}"
the problem is that all leds are recognizing with only one user button randomly. and no other buttons are working except 1st.
help me what is the problem?

0