/*C語言函數(shù)
*/

/*PORT B寄存器預(yù)定義*/
#define rGPBCON		(*(volatile unsigned *)0x56000010)
#define rGPBDAT		(*(volatile unsigned *)0x56000014)
#define rGPBUP		(*(volatile unsigned *)0x56000018)	

/*PORT F寄存器預(yù)定義*/
#define rGPFCON		(*(volatile unsigned *)0x56000050)
#define rGPFDAT		(*(volatile unsigned *)0x56000054)
#define rGPFUP		(*(volatile unsigned *)0x56000058)
	  
extern int delay(int time); /*聲明匯編函數(shù)*/

void Main()
{
	rGPFCON=0x0;        /*設(shè)置I/O口的GPF1為輸入*/
	rGPFUP=0xffff;      /*禁止GPF端口的上拉*/
	
	rGPBCON=0x0005;		/*設(shè)置I/O口GPB0,GPB1為輸出屬性*/
	rGPBUP=0xffff;			/*禁止GPB端口的上拉*/
	while(1)				/*不斷的循環(huán)*/
 	{
 	    if((rGPFDAT&0x0002)==0)      /*檢測(cè)按鍵S4是否按下*/
 	    {
 	        rGPBDAT=0xfc;				/*使GPB0輸出高電平，GPB1輸出低電平，LED3燈會(huì)滅,LED4燈會(huì)亮*/
		    delay(0xffff);				/*調(diào)用匯編延遲函數(shù)*/
		    rGPBDAT=0x03;				/*使GPB0輸出低電平，GPB1輸出高電平