main.c

ARM9的串口开发实例

//#include  "inc.c"

#define rGPFCON   (*(volatile unsigned *) 0x56000050)
#define rGPFDAT   (*(volatile unsigned *) 0x56000054) 
#define rGPFUP   (*(volatile unsigned *) 0x56000058)     
 extern delay (int time); 
 void Main () 
 {  rGPFCON=0x4000;   /*设置I/O口GPF7为输出属性*/  
 rGPFUP=0xffff;    /*禁止GPF端口的上拉*/  
 while(1)    /*不断的循环，D14将不停的闪烁*/    
 {     rGPFDAT=0xff;    /*使GPF7输出高电平，D14灯会灭*/   
 delay(0xbffff);     /*调用汇编延迟函数*/   
 rGPFDAT=0x0;    /*使GPE7输出低电平　D14灯亮*/   
 delay(0xbffff);     /*调用汇编延迟函数*/  
 }
 }