为何矩阵按键扫描不可以这样写，按按键时没反应

ID:91274 · 发表于 2015-10-23 22:33

#include<pic.h>
#define uchar unsigned char
#define uint  unsigned int
__CONFIG(0x3B31);
const uchar table1[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};
const uchar table[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0x88,0x83, 0xc6,0xa1,0x86,0x8e};
uchar key_num,sum,HL,kk;
void delay(uint x);
void init();
uchar scan();
void didi(uchar sum);
void shumaguan();

void main()
{
init();
while(1)
{
kk=scan();
      shumaguan();
}
}
void delay(uint z)
{
uint i,j;
for(i=z;i>0;i--)
for(j=110;j>0;j--);
}
void init()
{
// CMCON=0x07; //比较器关闭,RA0-RA3为IO
// CVRCON=0x00; //比较器电源关闭
// ADCON1=0x06; //AD转换关闭,AN0-AN7配置为数字IO
// TRISA=0xff;  //PORTA定义为输入
TRISB=0Xf0;  //定义RB0为输出  1111输入 0000输出
TRISC=0X00;  //PORTC定义为输出
// RB0=1;
// TRISD=0x00;  //PORTD定义为输出
PORTC=0xFF;
}

uchar scan()
{
PORTB=0xf0;    //1111 0000
key_num=PORTB;
key_num=key_num&0xf0;
if(key_num!=0xf0)
{
delay(5);
key_num=PORTB;       //1110 0000
      key_num=key_num&0xf0;//1110 0000
      if(key_num!=0xf0)
{
key_num=PORTB&0XF0;  //1110 0000
key_num=key_num|0X0F; //1110 1111
PORTB=key_num;
sum=PORTB;
key_num=key_num&0x0f;
sum=sum&0xf0;
HL=key_num+sum;
}
}
   return HL;
}

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

}C:\Users\root\Desktop\QQ截图20151023223500.png

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