需要一份详细的程序解释

ID:310270 · 发表于 2018-5-10 20:24

#include <reg52.h>
#define uchar unsigned char
#define uint unsigned int
sbit BEEP = P3^0;
sbit K1 = P3^7;

uchar code DSY_CODE[]=
{
0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0x88,0x80,0xc6,0xc0,0x86,0x8e
};
uchar Pre_KeyNO = 16,KeyNO = 16;

void DelayMS(uint ms)//延时函数
{
uchar t;
while(ms--)
{
     for(t=0;t<120;t++);
}
}

void Keys_Scan()
{
uchar Tmp;
P1 = 0x0f;
DelayMS(1); //利用短延时来消抖
Tmp = P1 ^ 0x0f;
switch(Tmp)
{
     case 1: KeyNO = 0; break;//列检测
case 2: KeyNO = 1; break;
case 4: KeyNO = 2; break;
case 8: KeyNO = 3; break;
default: KeyNO = 16;
}
P1 = 0xf0;
DelayMS(1);
Tmp = P1 >> 4 ^ 0x0f;//向后移4位，求出P1的值
switch(Tmp)
{
     case 1: KeyNO += 0; break;//行检测
case 2: KeyNO += 4; break;
case 4: KeyNO += 8; break;
case 8: KeyNO += 12;
}
}

void Beep()
{
uchar i;
for(i=0;i<50;i++)
{
     DelayMS(1);
BEEP = ~BEEP;
}
BEEP = 0;
}

void main()
{
P0 = 0x00;
      P2 = 0x00;
while(1)
{
     P1 = 0xf0;
if(P1 != 0xf0)
{
   Keys_Scan();
         P0 = 0x3f;//0
         P2 = ~DSY_CODE[KeyNO];//0~f
Beep();
         DelayMS(100);
}
if(K1==0)
{
      while(K1==0);
      while(1)
      {
         P1 = 0xf0;
         if(P1 != 0xf0)
         if(KeyNO<10)
         {
   Keys_Scan();
            P0 = 0x3f;
            P2 = ~DSY_CODE[KeyNO];
   Beep();
            DelayMS(100);
         }
         else
         {
   Keys_Scan();
            P0 = 0x06;//1
            P2 = ~DSY_CODE[KeyNO-10];//0~6
   Beep();
            DelayMS(100);
         }
         if(K1==0)
         {
            while(K1==0);
      break;
         }
      }
}

}
}

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