超声波数码管测距程序的疑问？

[复制链接]

电梯直达

楼主

ID:102056 发表于 2016-12-13 14:02 | 只看该作者 |只看大图回帖奖励

|倒序浏览 |阅读模式

      #include <AT89x51.H> //器件配置文件
   #include <intrins.h>
   #define  RX  P0_1
   #define  TX  P0_2
   unsigned int  time=0;
   unsigned int  timer=0;
   unsigned char posit=0;
   unsigned long S=0;
   bit    flag =0;
   unsigned char const discode[] ={ 0xC0,0xF9,0xA4,0xB0,0x99,0x92,0x82,0xF8,0x80,0x90,0xBF,0xff/*-*/};
   unsigned char const positon[3]={ 0xdf,0xef,0xf7};
   unsigned char disbuff[4]    ={ 0,0,0,0,};
/********************************************************/
void Display(void)    //扫描数码管
{
   if(posit==0)
   {P1=(discode[disbuff[posit]])&0x7f;}
   else
   {P1=discode[disbuff[posit]];}
   P2=positon[posit];
   if(++posit>=3)
   posit=0;
}
/********************************************************/