main.c

来自「ARMs3c2410的ADS应用代码.对ARM开发人员很有用。」· C语言 代码 · 共 34 行

/********************************************************
*file name:main.c
*description:gpio
*********************************************************/
#define rGPFCON    (*(volatile unsigned *)0x56000050) //Port F control
#define rGPFDAT    (*(volatile unsigned *)0x56000054) //Port F data
#define rGPFUP     (*(volatile unsigned *)0x56000058) //Pull-up control 
void delay(unsigned int);
int main()
{
 unsigned int led;
 rGPFCON=0x5500;
 rGPFUP=0xff;
 rGPFDAT=0x10;
 while(1)
 {
  led=rGPFDAT;
  led=(led<<1);
  rGPFDAT=led;
  delay(10);
  if(rGPFDAT&0x80)
     rGPFDAT=0x10;
  }
  return(0);
}

void delay(unsigned int x)
{
 unsigned int i,j,k;
 for(i=0;i<x;i++)
    for(j=0;j<200;j++)
      for(k=0;k<200;k++);
 }