4x4按键密码锁，帮看看为什么数码管没有数据变化。
P0是数码管控制口
P1是矩形按键
#include "reg52.h"
#include "DELAY.h"
typedef unsigned int u16;
typedef unsigned char u8;
u8 key_matrix_ranks_scan()
{
u8 key_value=0;
Delay1ms(10);
switch(P1)//保存第一列按键按下后的键值
{
case 0x77: key_value=1;break;
case 0x7b: key_value=2;break;
case 0x7d: key_value=3;break;
case 0x7e: key_value=4;break;
case 0xb7: key_value=5;break;
case 0xbb: key_value=6;break;
case 0xbd: key_value=7;break;
case 0xbe: key_value=8;break;
case 0xd7: key_value=9;break;
case 0xdb: key_value=10;break;
case 0xdd: key_value=11;break;
case 0xde: key_value=12;break;
case 0xe7: key_value=13;break;
case 0xeb: key_value=14;break;
case 0xed: key_value=15;break;
case 0xee: key_value=16;break;
}
while(P1==0xff);
return key_value;
}
u8 gsmg_code[16]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,
0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};
#define SMG P0
int key=0;
int main()
{
P1=0xff;
while(1)
{
key=key_matrix_ranks_scan();
if(key!=0)
SMG=gsmg_code[key-1];
}
}