usb_led.c

来自「ICKTEK-VC5509-A 实验3.9 USB接口加载程序实验」· C语言 代码 · 共 20 行

#define LED *(int *)0x400001
main()
{
   int i;   
   ioport unsigned int *EBSR =(unsigned int *)0x6c00;
   ioport unsigned int *CE21 =(unsigned int *)0x809;
   i=*EBSR;
   i= i&0xfffc;
   i=i+01;
   *EBSR=i;
   *CE21=0x1fff;
   for(;;){
  
   for(i=0;i<10000;i++)
   LED =0x55;
   for(i=0;i<10000;i++)
   LED =0xaa;
  }
}