led_asm_c.c

来自「广嵌GEC2410开发板学习教材源码」· C语言 代码 · 共 26 行

#define rGPFCON    (*(volatile unsigned *)0x56000050) //Port F control
#define rGPFDAT    (*(volatile unsigned *)0x56000054) //Port F data
#define rGPFUP     (*(volatile unsigned *)0x56000058) //Pull-up control F

extern void delay(int times);
void xmain(void)
{
	rGPFCON=(rGPFCON|0xFF00)&0x55FF;//GPF4--GPF7设置为output
    rGPFUP|=0xF0;   //disable GPF pull up
   while(1)
    {
       rGPFDAT=(rGPFDAT&0x0F)|0xE0;//GPF4 output 0
       delay(500000);//delay
       
       rGPFDAT=(rGPFDAT&0x0F)|0xD0;//GPF5 output 0
       delay(500000);//delay
       
       rGPFDAT=(rGPFDAT&0x0F)|0xB0;//GPF6 output 0
       delay(500000);//delay
       
       rGPFDAT=(rGPFDAT&0x0F)|0x70;//GPF7 output 0
       delay(500000);//delay
    }
 }