大神帮我看下我这个C51单片机4*4矩阵键盘扫描，在keil变量窗口查看键入值。

#include#includevoid delay(unsigned long i ) { unsigned int a; unsigned int b; for(a=i;a>0;a--) for(b=255;b>0;b--);} unsigned char Key_scan(void){ char m,i,k; while(P1!=0xf0) { k=0xfe; for(i=0;i<4;i++){ P1=k; delay(1000); m=P1&0xf0; P0=k&0x0f; switch(m) { case 0xe0:return i; case 0xd0:return i+4; case 0xb0:return i+8; case 0x70:return i+12; default:break; } k=_crol_(k,1); //P1=_crol_(P1,1); } } }void main(){ while(1) { P2=Key_scan(); }}

uchar scan() //扫描键值的子程序
{
P1=0xf0;
scan0=P1;
delay1ms(20);

if(scan0!=0xf0) //判键是否按下
{
scan0=P1;
if(scan0!=0xf0) //二次判键是否按下
{
P1=0x0f; //线反转法的核心
delay1ms(20);
scan1=P1;
keycode=scan0|scan1; //组合成键编码
for(m=0;m<16;m++)
{
if(keycode==x[m]) //查表得键值
{
key=m;

}

}
}
}
return(key);
}
给你一个可以用的

uchar keyscan() { P3=0xfe; temp=P3; temp=temp&0xf0; while(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; } } } P3=0xfd; temp=P3; temp=temp&0xf0; while(temp!=0xf0) { delay(5); temp=P3; temp=temp&0xf0; while(temp!=0xf0) { temp=P3; switch(temp) { case 0xed:num=5; break; case 0xdd:num=6; break; case 0xbd:num=7; break; case 0x7d:num=8; break; } while(temp!=0xf0) { temp=P3; temp=temp&0xf0; } } } P3=0xfb; temp=P3; temp=temp&0xf0; while(temp!=0xf0) { delay(5); temp=P3; temp=temp&0xf0; while(temp!=0xf0) { temp=P3; switch(temp) { case 0xeb:num=9; break; case 0xdb:num=10; break; case 0xbb:num=11; break; case 0x7b:num=12; break; } while(temp!=0xf0) { temp=P3; temp=temp&0xf0; } } } P3=0xf7; temp=P3; temp=temp&0xf0; while(temp!=0xf0) { delay(5); temp=P3; temp=temp&0xf0; while(temp!=0xf0) { temp=P3; switch(temp) { case 0xe7:num=13; break; case 0xd7:num=14; break; case 0xb7:num=15; break; case 0x77:num=16; break; } while(temp!=0xf0) { temp=P3; temp=temp&0xf0; } } } return num; }

#include<reg52.h> #include <intrins.h> void delay(unsigned long i ) { unsigned int a, b; for(a = i; a > 0; a--) for(b = 255; b > 0; b--); } unsigned char Key_scan(void) { unsigned char m, i, k; P1 = 0xf0; if (P1 != 0xf0) { delay(10); if (P1 != 0xf0) { k = 0xfe; for(i = 0; i < 4; i++) { P1 = k; m = P1 & 0xf0; switch(m) { case 0xe0: return i + 0; case 0xd0: return i + 4; case 0xb0: return i + 8; case 0x70: return i + 12; } k = _crol_(k, 1); } } } return 255; } void main() { while(1) { P2 = Key_scan(); } }

if (P1 ; case 0xb0; m = P1 & 0xf0; #include P1 = 0xf0, b; for(a = i; a >, i, k#include 4; i++) { P1 = k: return i + 8; case 0x70: return i + 12; } k = _crol_(k, 1); } } } return 255; } void main() { while(1) {

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