PIC16F877矩阵键盘的识别
原文地址：http://blog.sina.com.cn/s/blog_4a3946360100mwqh.html
關于矩陣鍵盤的識別方法在51矩陣鍵盤識別中已經說過，現在要說的是PIC單片機與51單片機的區別，主要是PIC單片機的口子的輸入輸出需要TRISn寄存器設置，具體如下：
?
掃描法：
#include<pic.h>
#define uchar unsigned char
#define uint unsigned int
uchar num;
const ucharSSEG[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};
void delay1ms(uint z)
{
?uint x;
?uchar y;
?for(x=z;x>0;x--)
??for(y=110;y>0;y--);
}
void keyscan()
{
?uchar temp;
?TRISB=0x0f;
?PORTB=0x7f;
?temp=PORTB&0x0f;
?if(temp!=0x0f)
?{
??delay1ms(10);
??temp=PORTB&0x0f;
??if(temp!=0x0f)
??{
???num=temp|0x70;?
??}
??temp=PORTB&0x0f;
??while(temp!=0x0f)
??{
???temp=PORTB&0x0f;??
??}
??switch(num)
??{
???case 0x7e:num =12;break;
????case0x7d: num =13;break;
???case 0x7b:num =14;break;
???case 0x77:num =15;break;
??}
?}
?PORTB=0xbf;
?temp=PORTB&0x0f;
?if(temp!=0x0f)
?{
??delay1ms(10);
??temp=PORTB&0x0f;
??if(temp!=0x0f)
??{
???num=temp|0xb0;?
??}
??temp=PORTB&0x0f;
??while(temp!=0x0f)
??{
???temp=PORTB&0x0f;??
??}
??switch(num)
??{
???case 0xbe:num =8;break;
????case0xbd: num =9;break;
???case 0xbb:num =10;break;
???case 0xb7:num =11;break;
??}
?}
?PORTB=0xdf;
?temp=PORTB&0x0f;
?if(temp!=0x0f)
?{
??delay1ms(10);
??temp=PORTB&0x0f;
??if(temp!=0x0f)
??{
???num=temp|0xd0;?
??}
??temp=PORTB&0x0f;
??while(temp!=0x0f)
??{
???temp=PORTB&0x0f;??
??}
??switch(num)
??{
???case 0xde:num =4;break;
????case0xdd: num =5;break;
???case 0xdb:num =6;break;
???case 0xd7:num =7;break;
??}
?}
?PORTB=0xef;
?temp=PORTB&0x0f;
?if(temp!=0x0f)
?{
??delay1ms(10);
??temp=PORTB&0x0f;
??if(temp!=0x0f)
??{
???num=temp|0xe0;?
??}
??temp=PORTB&0x0f;
??while(temp!=0x0f)
??{
???temp=PORTB&0x0f;??
??}
??switch(num)
??{
???case 0xee:num =0;break;
????case0xed: num =1;break;
???case 0xeb:num =2;break;
???case 0xe7:num =3;break;
??}
?}??????
}
void main()
{
?num=0xff;
?TRISD=0;
?PORTD=0;
?while(1)
?{
??keyscan();
??PORTD=~SSEG[num];
?}
}
?
線反轉法：
#include<pic.h>
#define uchar unsigned char
#define uint unsigned int
uchar num;
const ucharSSEG[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};
void delay1ms(uint z)
{
?uint x;
?uchar y;
?for(x=z;x>0;x--)
??for(y=110;y>0;y--);
}
void keyscan()
{
?uchar temp,z,x;
?TRISB=0x0f;
?PORTB=0x0f;
?x=PORTB&0x0f;
?if(x!=0x0f)
?{
??delay1ms(10);
??x=PORTB&0x0f;
??if(x!=0x0f)
??{
???temp=PORTB&0x0f;
???TRISB=0xf0;
???PORTB=0xf0;??
???z=temp|PORTB;
???x=PORTB&0xf0;
???while(x!=0xf0)//松手檢測
???{
????x=PORTB&0xf0;??
???}
???switch(z)
???{
????case0xee: num =0; break;
?????????case 0xde: num =4; break;
?????????case 0xbe: num =8; break;
?????????case 0x7e: num =12; break;
?????????case 0xed: num =1; break;
?????????case 0xdd: num =5; break;
?????????case 0xbd: num =9; break;
?????????case 0x7d: num =13; break;
?????????case 0xeb: num =2; break;
?????????case 0xdb: num =6;break;????
?????????case 0xbb: num =10;break;
?????????case 0x7b: num =14;break;
?????????case 0xe7: num =3;break;
?????????case 0xd7: num =7;break;
?????????case 0xb7: num =11;break;
?????????case 0x77: num =15;break;
???}
??}
?}
}
void main()
{
num=0xff;
?TRISD=0;
?PORTD=0;
?while(1)
?{
??keyscan();
??PORTD=~SSEG[num];
?}
}
轉載于:https://www.cnblogs.com/hnrainll/archive/2010/12/21/1912936.html
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