用这个代码写出来矩阵键盘完全控制不了LED,想知道为什么。
矩阵键盘肯定没坏,已经试验过了。
#include "reg52.h"
sfr P4 = 0xc0;
sbit R1 = P3^0;
sbit R2 = P3^1;
sbit R3 = P3^2;
sbit R4 = P3^3;
unsigned char code SMG_duanma[18]=
{0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,
0x80,0x90,0x88,0x80,0xc6,0xc0,0x86,0x8e,0xbf,0x7f};
sbit C4 = P3^4;
sbit C3 = P3^5;
sbit C2 = P4^2;
sbit C1 = P4^4;
void SelectHC573(unsigned char channel)
{
switch(channel)
{
case 4:
P2=(P2 & 0x1f) | 0x80;
break;
case 5:
P2=(P2 & 0x1f) | 0xa0;
break;
case 6:
P2=(P2 & 0x1f) | 0xc0;
break;
case 7:
P2=(P2 & 0x1f) | 0xe0;
break;
}
}
void DisplayKeyNum(unsigned char value)
{
SelectHC573(6);
P0 = 0x01;
SelectHC573(6);
P0 = value;
}
unsigned char key_num;
void ScanKeyMulti()
{
R1 = 0;
R2 = R3 = R4 = 1;
C1 = C2 = C3 = C4 = 1;
if(C1 == 0)
{
while(C1 == 0);
key_num = 0;
DisplayKeyNum(SMG_duanma[key_num]);
}
else if(C2 == 0)
{
while(C2 == 0);
key_num = 1;
DisplayKeyNum(SMG_duanma[key_num]);
}
else if(C3 == 0)
{
while(C3 == 0);
key_num = 2;
DisplayKeyNum(SMG_duanma[key_num]);
}
else if(C4 == 0)
{
while(C4 == 0);
key_num = 3;
DisplayKeyNum(SMG_duanma[key_num]);
}
R2 = 0;
R1 = R3 = R4 = 1;
C1 = C2 = C3 = C4 = 1;
if(C1 == 0)
{
while(C1 == 0);
key_num = 4;
DisplayKeyNum(SMG_duanma[key_num]);
}
else if(C2 == 0)
{
while(C2 == 0);
key_num = 5;
DisplayKeyNum(SMG_duanma[key_num]);
}
else if(C3 == 0)
{
while(C3 == 0);
key_num = 6;
DisplayKeyNum(SMG_duanma[key_num]);
}
else if(C4 == 0)
{
while(C4 == 7);
key_num = 3;
DisplayKeyNum(SMG_duanma[key_num]);
}
R3 = 0;
R2 = R1 = R4 = 1;
C1 = C2 = C3 = C4 = 1;
if(C1 == 0)
{
while(C1 == 0);
key_num = 8;
DisplayKeyNum(SMG_duanma[key_num]);
}
else if(C2 == 0)
{
while(C2 == 0);
key_num = 9;
DisplayKeyNum(SMG_duanma[key_num]);
}
else if(C3 == 0)
{
while(C3 == 0);
key_num = 10;
DisplayKeyNum(SMG_duanma[key_num]);
}
else if(C4 == 0)
{
while(C4 == 0);
key_num = 11;
DisplayKeyNum(SMG_duanma[key_num]);
}
R4 = 0;
R2 = R3 = R1 = 1;
C1 = C2 = C3 = C4 = 1;
if(C1 == 0)
{
while(C1 == 0);
key_num = 12;
DisplayKeyNum(SMG_duanma[key_num]);
}
else if(C2 == 0)
{
while(C2 == 0);
key_num = 13;
DisplayKeyNum(SMG_duanma[key_num]);
}
else if(C3 == 0)
{
while(C3 == 0);
key_num = 14;
DisplayKeyNum(SMG_duanma[key_num]);
}
else if(C4 == 0)
{
while(C4 == 0);
key_num = 15;
DisplayKeyNum(SMG_duanma[key_num]);
}
}
void main()
{
while(1)
{
ScanKeyMulti();
}
}
```