單片機(jī)矩陣鍵盤C語言程序不運行不用return,不寫成函數(shù),在while大循環(huán)里可以

ID:994128 · 發(fā)表于 2022-1-2 10:38

#include<reg52.h>
#define uchar unsigned char
#define uint unsigned int
sbit wela=P2^7;
sbit dula=P2^6;
uchar temp,num;
uchar code table[]={
0x3f,0x06,0x5b,0x4f,
0x66,0x6d,0x7d,0x07,
0x7f,0x6f,0x77,0x7c,
0x39,0x5e,0x79,0x71,0};
void delay(uchar z);
uchar keyscan();
void display(uchar aa);
void main()
{
      num=17;
      dula=1;
      P0=0;
      dula=0;
      wela=1;
      P0=0xc0;
      wela=0;
      while(1)
      {
                  display(keyscan());

      }
}
void display(uchar aa)
{
      dula=1;
      P0=table[aa-1];
      dula=0;
}
uchar keyscan()
{
      P3=0xfe;
      temp=P3;
      temp=temp&0xf0;
      if(temp!=0xf0)
      {
            delay(5);
            temp=P3;
         temp=temp&0xf0;
            while(temp!=0xf0)
            {
               temp=P3;
               switch(temp)
               {
                     case 0xee:num=1;
                              break;
                     case 0xde:num=2;
                              break;
                     case 0xbe:num=3;
                              break;
                     case 0x7e:num=4;
                              break;
                  }
               while(temp!=0xf0);
               {
               temp=P3;
               temp=temp&0xf0;
               }
               }
      }
      return num;
}
void delay(uchar z)
{
      uint x,y;
      for(x=z;x>0;x--)
            for(y=110;y>0;y--);
}
代碼是先寫，后照范例改