Accessing GPIO pins

hello friends,

Iam new to CE 5.0 and Iam using intelPXA270 processor. I want to write 
bytes to processor GPIO control register. it is possible to write 
directly, for example I defined
 
#define GAFR2 (*((volatile unsigned long *) 0x40E00068))
GAFR2 = 0x64000000;

unfortunetely I cannot see my GPIO pins acts accordingly. It is 
possible to write directly or there are some functions in Windows CE 
5.0 to control processor registers. I appreciate if someone just pass 
hints on how to access processor register under CE 5.0

thanks






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