gpftest.c

C和汇编语言的混合编程实验基于S3C2410的

/*C语言函数*/
/*端口F寄存器预定义*/
#define GPFCON    (*(volatile unsigned *)0x56000050) //Port F control
#define GPFDAT    (*(volatile unsigned *)0x56000054) //Port F data
#define GPFUP     (*(volatile unsigned *)0x56000058) //Pull-up control F	
	  
extern int delay(int time); /*声明汇编函数*/

int Main()
{
       GPFCON=(GPFCON|0xFF00)&0xFFFF55FF;//GPF4--GPF7设置为output
       GPFUP|=0xFF00;   //disable GPF pull up
   while(1)
    {
       int i=0;
       GPFDAT=(GPFDAT&0xFFFFFF0F)|0xE0;
       delay(0x1ffff);
       
       GPFDAT=(GPFDAT&0xFFFFFF0F)|0xD0;
       delay(0x1ffff);
       
       GPFDAT=(GPFDAT&0xFFFFFF0F)|0xB0;
       delay(0x1ffff);
       
       GPFDAT=(GPFDAT&0xFFFFFF0F)|0x70;
       delay(0x1ffff);
    }
 }