/************************************************
程序名稱：跑馬燈
簡要說明：P1-P6口發光二極管左移右移顯示
編寫：江肖
時間地點：2008-07-18湖北工業大學暑期電賽培訓基地
************************************************/
#include <msp430x14x.h>
void delay();
void main (void)
{
  WDTCTL = WDTPW + WDTHOLD;  //關閉看門狗;
  P1DIR |=0xff;
  P2DIR |=0xff;
  P3DIR |=0xff;
  P4DIR |=0xff;
  P5DIR |=0xff;
  P6DIR |=0xff;
  unsigned char j,a,b; 
  unsigned char k;
  while(1)
  {
    k =0x01;          //賦初值
   for(j=0;j<8;j++)   //從左到右
    {
     a =k<<j;         //在移位后K的值不變
     b =k>>(8-j);
     P1OUT = a|b;
     P2OUT = a|b;
     P3OUT = a|b;
     P4OUT = a|b;
     P5OUT = a|b;
     P6OUT = a|b;
     delay();
    }
   for(j=2;j<8;j++)  //從右到左
    {
     a =k>>j;
     b =k<<(8-j);
     P1OUT = a|b;
     P2OUT = a|b;
     P3OUT = a|b;
     P4OUT = a|b;
     P5OUT = a|b;
     P6OUT = a|b;
     delay();
    }
  }
}

/*****************************************
延時子程序
*****************************************/

void delay()
{
  unsigned long i=20000;
  do (i--);
  while (i !=0);
}