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#include<reg52.h>
#define uint unsigned int
#define uchar unsigned char
sbit wela = P2^7; //位選端口
sbit dula = P2^6; //段選端口
sbit beep = P2^3; //蜂鳴器端口
uchar temp, num;
void keyscan();
void delay(uchar num);
void display(uchar num);
void initialization();
uchar code Table[] = //數碼管段碼數組
{
0x3F,0x06,0x5B,0x4F,0x66,0x6D, //共陰極段碼 0 1 2 3 4 5
0x7D,0x07,0x7F,0x6F,0x77,0x7C, //共陰極段碼 6 7 8 9 A b
0x39,0x5E,0x79,0x71,0x73,0x3E, //共陰極段碼 C d E F P U
0x31,0x6E,0x76,0x38,0x00 //共陰極段碼 T y H L 滅燈
};
void main()
{
initialization();
while (1)
{
beep = 0;
keyscan();
}
}
/************延時函數*************/
void delay(uchar num) //延時 num ms
{
uint x, y;
for(x = num; x > 0; x--)
{
for(y = 110; y > 0; y--);
}
}
/**** 鍵盤掃描函數 ****
**** 函數功能 ****
**** 掃描4*4矩陣鍵盤的輸入 ****/
void keyscan()
{
P3 = 0xfe; //檢測第一行矩陣鍵盤（0-3）
temp = P3;
temp = temp & 0xf0; //判斷是否有按鍵按下
while(temp != 0xf0)
{
delay(5);
P3 = 0xfe;
temp = temp & 0xf0;
while(temp != 0xf0) //延時消抖確認有按鍵按下
{
temp = P3;
switch (temp)
{
case 0xee: num = 0; //檢測到第一個鍵按下
break;
case 0xde: num = 1; //檢測到第二個鍵按下
break;
case 0xbe: num = 2; //檢測到第三個鍵按下
break;
case 0x7e: num = 3; //檢測到第四個鍵按下
break;
}
while(temp != 0xf0) //松手檢測
{
temp = P3;
temp = temp & 0xf0;
}
display(num);
}
}
P3 = 0xfd; //檢測第二行矩陣鍵盤（4-7）
temp = P3;
temp = temp & 0xf0; //判斷是否有按鍵按下
while(temp != 0xf0)
{
delay(5);
P3 = 0xfd;
temp = temp & 0xf0;
while(temp != 0xf0) //延時消抖確認有按鍵按下
{
temp = P3;
switch (temp)
{
case 0xed: num = 4; //檢測到第一個鍵按下
break;
case 0xdd: num = 5; //檢測到第二個鍵按下
break;
case 0xbd: num = 6; //檢測到第三個鍵按下
break;
case 0x7d: num = 7; //檢測到第四個鍵按下
break;
}
while(temp != 0xf0) //松手檢測
{
temp = P3;
temp = temp & 0xf0;
}
display(num);
}
}
P3 = 0xfb; //檢測第三行矩陣鍵盤（8-11）
temp = P3;
temp = temp & 0xf0; //判斷是否有按鍵按下
while(temp != 0xf0)
{
delay(5);
P3 = 0xfb;
temp = temp & 0xf0;
while(temp != 0xf0) //延時消抖確認有按鍵按下
{
temp = P3;
switch (temp)
{
case 0xeb: num = 8; //檢測到第一個鍵按下
break;
case 0xdb: num = 9; //檢測到第二個鍵按下
break;
case 0xbb: num = 10; //檢測到第三個鍵按下
break;
case 0x7b: num = 11; //檢測到第四個鍵按下
break;
}
while(temp != 0xf0) //松手檢測
{
temp = P3;
temp = temp & 0xf0;
}
display(num);
}
}
P3 = 0xf7; //檢測第四行矩陣鍵盤（12-15）
temp = P3;
temp = temp & 0xf0; //判斷是否有按鍵按下
while(temp != 0xf0)
{
delay(5);
P3 = 0xf7;
temp = temp & 0xf0;
while(temp != 0xf0) //延時消抖確認有按鍵按下
{
temp = P3;
switch (temp)
{
case 0xe7: num = 12; //檢測到第一個鍵按下
break;
case 0xd7: num = 13; //檢測到第二個鍵按下
break;
case 0xb7: num = 14; //檢測到第三個鍵按下
break;
case 0x77: num = 15; //檢測到第四個鍵按下
break;
}
while(temp != 0xf0) //松手檢測
{
temp = P3;
temp = temp & 0xf0;
}
display(num);
}
}
}
void display(uchar num) //數碼管顯示函數
{
beep = 1;
dula = 1;
P0 = Table[num];
dula = 0;
}
void initialization() //數碼管初始化
{
dula = 1; //開段碼鎖存
P0 = 0x00; //設數碼管初值
dula = 0;
wela = 1;
P0 = 0xc0; //選通6根數碼管
wela = 0;
}

復制代碼

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