ledtest.c

来自「包含s3c2440几乎所有测试程序代码」· C语言 代码 · 共 31 行

/*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 xmain()
{
       GPFCON=(GPFCON|0xFF00)&0xFFFF55FF;//GPF4--GPF7设置为output
       GPFUP|=0xF0;   //disable GPF pull up
   while(1)
    {
    
       GPFDAT=(GPFDAT&0x0F)|0xE0;//GPF4 output 0
       delay(0x5fffff);//调用汇编语言编写的延时程序
       
       GPFDAT=(GPFDAT&0x0F)|0xD0;//GPF5 output 0
       delay(0x5fffff);//调用汇编语言编写的延时程序
       
       GPFDAT=(GPFDAT&0x0F)|0x70;//GPF7 output 0
       delay(0x5fffff);//调用汇编语言编写的延时程序       
      
       GPFDAT=(GPFDAT&0x0F)|0xB0;//GPF6 output 0
       delay(0x5fffff);//调用汇编语言编写的延时程序
       

    }
 }