通用輸入輸出介面的簡稱，
s2440一共有130個gpio口，分為a~j共9組：gpa,gpb,gpc……gpj;通過設定相應的暫存器，可以選擇某個gpio口是用於輸入，輸出還是特定其他特殊功能。例如可以設定gph6口用於輸入輸出，或者是串列埠；
每組gpio(gpa-gpj),都可以通過3個暫存器來控制與訪問，這三個暫存器分別是
程式：
#include
"def.h"
#include
"option.h"
#include
"2440addr.h"
#include
"2440lib.h"
#include
"2440slib.h"
//******************************==
//延時函式
void
dely
(u32 tt)}}
intmain
(int argc,
char
**ar**)
return0;
}
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