PIC:矩陣鍵盤(pán)掃描（if()else嵌套方式）

 /*
為自已寫(xiě)的矩陣鍵盤(pán)檢測(cè)+數(shù)碼管顯示+蜂鳴器響
采用if().....else嵌套方式；編譯通過(guò)，卻后二列顯示不出來(lái)（你找出來(lái)了嗎？一個(gè)不算問(wèn)題的問(wèn)題）
*/
//----------------------------------------------------------------

#include <pic.h>
#define uint unsigned int
#define uchar unsigned char
__CONFIG(0x3B31);
const unsigned char table[] = {0x3f,0x6,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};  //數(shù)碼管數(shù)組
//--------------------變量定義------------------------------------
uint keynum,keytem,num;  //定義變量,//keynum按鍵端口讀回值，keytem為松手檢測(cè)值（以示區(qū)分）,num數(shù)碼管 
//--------------------函數(shù)調(diào)用 聲明-------------------------------
void init();    //初始化函數(shù)
void keyscan();    //矩陣鍵盤(pán)掃描
void didi(uchar dinum);  //蜂鳴器
void disp();  //數(shù)碼管顯示
//-------------------主函數(shù)---------------------------------------
void delay(x)  //延時(shí)函數(shù)，幾乎每個(gè)程序都要用到，所以放在了主函數(shù)分界線內(nèi)
{
uchar a,b;
for (a=x;a>0;a--)
 for(b=110;b>0;b--);
}

void main()
{
init();  //初始化
while(1)
 {
 keyscan(); //矩陣鍵盤(pán)掃描
 disp();  //數(shù)碼管顯示
 }
}
//------------初始化函數(shù)-------------------------------------------
void init() 
{
TRISA=0;PORTA=0x02; //38譯碼器

TRISB=1;                       //矩陣鍵盤(pán)

TRISC=0;PORTC=0x01;; //38使能
TRISD=0;PORTD=0x00;  //LED燈(數(shù)碼管)
TRISE=0;PORTE=0x00;  //蜂鳴器
}
//----------要調(diào)用的函數(shù)--------------------------------------------
void keyscan()
{                           //第一列掃描

PORTB=0xef;     //送出RB4=1110  1111
 keynum=PORTB;    

 keynum=keynum&0x0f; 

 if(keynum!=0xef)   

 {
  delay(5);   

  keynum=PORTB;   

  keynum=keynum&0x0f;
  if(keynum!=0x0f)  

  {
   keytem=keynum; 

   didi(1);
   while(keytem!=0x0f)

    {
    keytem=PORTB;
    keytem=keytem&0x0f; 

    }
  keynum=keynum|0xe0;  

  }
 
 else       //第二列掃描
  {
  PORTB=0xdf;     

  keynum=PORTB;    

  keynum=keynum&0x0f; 

  if(keynum!=0xdf)  

   {
   delay(5);  

   keynum=PORTB;  

   keynum=keynum&0x0f;
   if(keynum!=0x0f)  

    {
    keytem=keynum;  

    didi(1);
    while(keytem!=0x0f) 

     {
     keytem=PORTB;
     keytem=keytem&0x0f;

     }
   keynum=keynum|0xd0;  

    }
   }
  else       

     {
   PORTB=0xbf;     

   keynum=PORTB;    

   keynum=keynum&0x0f; 

   if(keynum!=0xbf)  

   {
    delay(5);  

    keynum=PORTB;   

    keynum=keynum&0x0f;
    if(keynum!=0x0f)

     {
     keytem=keynum;  

     didi(1);
     while(keytem!=0x0f)

      {
      keytem=PORTB;
      keytem=keytem&0x0f;

      }
    keynum=keynum|0xb0;  

     }
    
    else       //第四列掃描
     {
     PORTB=0x7f;   

     keynum=PORTB;   

     keynum=keynum&0x0f;

     if(keynum!=0x7f)

      {
      delay(5);    

      keynum=PORTB;  

      keynum=keynum&0x0f;
      if(keynum!=0x0f) 

       {
       keytem=keynum;  

       didi(1);
       while(keytem!=0x0f) 

        {
        keytem=PORTB;
        keytem=keytem&0x0f;

        }
      keynum=keynum|0x70;   

       }
      }
     } //////// 

   }
  }
 }
  }
}

void didi(uchar dinum)
{
uchar di_num;
for(di_num=dinum;di_num>0;di_num--)
 {
 RE0=1;
 delay(100);
 RE0=0;
 delay(50);
 }
}

void disp()
{
switch(keynum)
 {
 case 0xee:PORTD=table[1];break;
 case 0xed:PORTD=table[2];break;
 case 0xeb:PORTD=table[3];break;
 case 0xe7:PORTD=table[4];break;
 case 0xde:PORTD=table[5];break;
 case 0xdd:PORTD=table[6];break;
 case 0xdb:PORTD=table[7];break;
 case 0xd7:PORTD=table[8];break;
 case 0xbe:PORTD=table[9];break;
 case 0xbd:PORTD=table[10];break;
 case 0xbb:PORTD=table[11];break;
 case 0xb7:PORTD=table[12];break;
 case 0x7e:PORTD=table[13];break;
 case 0x7d:PORTD=table[14];break;
 case 0x7b:PORTD=table[15];break;
 case 0x77:PORTD=table[0];break;
 } 
}