超声波数码管测距程序的疑问？ -

标题: 超声波数码管测距程序的疑问？ [打印本页]

作者: king@ 时间: 2016-12-13 14:02
标题: 超声波数码管测距程序的疑问？
      #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;
}
/********************************************************/

谁能帮我解释一下扫描数码管这段程序的意思？

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