单片机4*4矩阵键盘扫描Proteus仿真程序（含松手检测消抖处理） -

#include<reg52.h>
#define uint unsigned int
#define uchar unsigned char
sbit wela = P2^7; //位选端口
sbit dula = P2^6; //段选端口
sbit beep = P2^3; //蜂鸣器端口
uchar temp, num;
void keyscan();
void delay(uchar num);
void display(uchar num);
void initialization();
uchar code Table[] = //数码管段码数组
{
0x3F,0x06,0x5B,0x4F,0x66,0x6D, //共阴极段码 0 1 2 3 4 5
0x7D,0x07,0x7F,0x6F,0x77,0x7C, //共阴极段码 6 7 8 9 A b
0x39,0x5E,0x79,0x71,0x73,0x3E, //共阴极段码 C d E F P U
0x31,0x6E,0x76,0x38,0x00 //共阴极段码 T y H L 灭灯
};
void main()
{
initialization();
while (1)
{
beep = 0;
keyscan();
}
}
/************延时函数*************/
void delay(uchar num) //延时 num ms
{
uint x, y;
for(x = num; x > 0; x--)
{
for(y = 110; y > 0; y--);
}
}
/**** 键盘扫描函数 ****
**** 函数功能 ****
**** 扫描4*4矩阵键盘的输入 ****/
void keyscan()
{
P3 = 0xfe; //检测第一行矩阵键盘（0-3）
temp = P3;
temp = temp & 0xf0; //判断是否有按键按下
while(temp != 0xf0)
{
delay(5);
P3 = 0xfe;
temp = temp & 0xf0;
while(temp != 0xf0) //延时消抖确认有按键按下
{
temp = P3;
switch (temp)
{
case 0xee: num = 0; //检测到第一个键按下
break;
case 0xde: num = 1; //检测到第二个键按下
break;
case 0xbe: num = 2; //检测到第三个键按下
break;
case 0x7e: num = 3; //检测到第四个键按下
break;
}
while(temp != 0xf0) //松手检测
{
temp = P3;
temp = temp & 0xf0;
}
display(num);
}
}
P3 = 0xfd; //检测第二行矩阵键盘（4-7）
temp = P3;
temp = temp & 0xf0; //判断是否有按键按下
while(temp != 0xf0)
{
delay(5);
P3 = 0xfd;
temp = temp & 0xf0;
while(temp != 0xf0) //延时消抖确认有按键按下
{
temp = P3;
switch (temp)
{
case 0xed: num = 4; //检测到第一个键按下
break;
case 0xdd: num = 5; //检测到第二个键按下
break;
case 0xbd: num = 6; //检测到第三个键按下
break;
case 0x7d: num = 7; //检测到第四个键按下
break;
}
while(temp != 0xf0) //松手检测
{
temp = P3;
temp = temp & 0xf0;
}
display(num);
}
}
P3 = 0xfb; //检测第三行矩阵键盘（8-11）
temp = P3;
temp = temp & 0xf0; //判断是否有按键按下
while(temp != 0xf0)
{
delay(5);
P3 = 0xfb;
temp = temp & 0xf0;
while(temp != 0xf0) //延时消抖确认有按键按下
{
temp = P3;
switch (temp)
{
case 0xeb: num = 8; //检测到第一个键按下
break;
case 0xdb: num = 9; //检测到第二个键按下
break;
case 0xbb: num = 10; //检测到第三个键按下
break;
case 0x7b: num = 11; //检测到第四个键按下
break;
}
while(temp != 0xf0) //松手检测
{
temp = P3;
temp = temp & 0xf0;
}
display(num);
}
}
P3 = 0xf7; //检测第四行矩阵键盘（12-15）
temp = P3;
temp = temp & 0xf0; //判断是否有按键按下
while(temp != 0xf0)
{
delay(5);
P3 = 0xf7;
temp = temp & 0xf0;
while(temp != 0xf0) //延时消抖确认有按键按下
{
temp = P3;
switch (temp)
{
case 0xe7: num = 12; //检测到第一个键按下
break;
case 0xd7: num = 13; //检测到第二个键按下
break;
case 0xb7: num = 14; //检测到第三个键按下
break;
case 0x77: num = 15; //检测到第四个键按下
break;
}
while(temp != 0xf0) //松手检测
{
temp = P3;
temp = temp & 0xf0;
}
display(num);
}
}
}
void display(uchar num) //数码管显示函数
{
beep = 1;
dula = 1;
P0 = Table[num];
dula = 0;
}
void initialization() //数码管初始化
{
dula = 1; //开段码锁存
P0 = 0x00; //设数码管初值
dula = 0;
wela = 1;
P0 = 0xc0; //选通6根数码管
wela = 0;
}

复制代码