51单片机-计时器-倒计时闹钟
1. 视频
bilibili视频地址：
https://www.bilibili.com/video/av91943244
<iframe allowfullscreen="true" data-mediaembed="bilibili" frameborder="0" id="vQrw9AB6-1582777292529" src="https://player.bilibili.com/player.html?aid=91943244"></iframe>51单片机-计时器-倒计时闹钟
2. 文件
文件下载地址：
https://download.csdn.net/download/weixin_43130546/12194355
3. 说明
注意KeyScan()函数if语句！
蜂鸣器频率问题；
想到再补充。
4. 代码
#include <reg52.h>
sbit BUZZER = P2^3;
sbit DULA = P2^6;
sbit WELA = P2^7;
sbit KEYOUT1 = P3^0;
sbit KEYOUT2 = P3^1;
sbit KEYOUT3 = P3^2;
sbit KEYOUT4 = P3^3;
sbit KEYIN1 = P3^4;
sbit KEYIN2 = P3^5;
sbit KEYIN3 = P3^6;
sbit KEYIN4 = P3^7;
unsigned char code DUTable[16] =
{
0x3F,0x06,0x5B,0x4F,
0x66,0x6D,0x7D,0x07,
0x7F,0x6F,0x77,0x7C,
0x39,0x5E,0x79,0x71
};
unsigned char code WETable[8] =
{
~0x80,~0x40,~0x20,~0x10,
~0x08,~0x04,~0x02,~0x01
};
unsigned char LedBuff[8] =
{
0x3F,0x00,0x00,0X00,
0X00,0X00,0X00,0X00
};
unsigned char code KeyCode[4][4] =
{
{0x31,0x32,0x33,0x26}, // 1 2 3 up
{0x34,0x35,0x36,0x25}, // 4 5 6 left
{0x37,0x38,0x39,0x28}, // 7 8 9 down
{0x30,0x1B,0x0D,0x27} // 0 ESC enter right
};
unsigned char KeyStay[4][4] =
{
{1,1,1,1},{1,1,1,1},{1,1,1,1},{1,1,1,1}
};
unsigned long pdata KeyTime[4][4] =
{
{0,0,0,0},{0,0,0,0},{0,0,0,0},{0,0,0,0}
};
unsigned char T0RH,T0RL;
bit enBuzz = 0;
bit flagCount = 0;
bit flag1s = 0;
unsigned long CountNum = 0;
void ConfigTimer0(unsigned char ms);
void KeyDriver(void);
void ShowNumber(void);
void main(void)
{
ConfigTimer0(1);
while(1)
{
KeyDriver();
if(flagCount && flag1s)
{
flag1s = 0;
if(CountNum > 0)
{
CountNum--;
ShowNumber();
if(0 == CountNum)
{
enBuzz = 1;
P1 = 0x00;
flagCount = 0;
}
}
}
}
}
void ConfigTimer0(unsigned char ms)
{
unsigned long tmp;
tmp = 11059200 / 12;
tmp = tmp * ms / 1000;
tmp = 65536 - tmp;
tmp += 18;
T0RH = (unsigned char)(tmp>>8);
T0RL = (unsigned char)tmp;
TH0 = T0RH;
TL0 = T0RL;
TMOD &= 0xF0;
TMOD |= 0x01;
EA = 1;
ET0 = 1;
TF0 = 0;
TR0 = 1;
}
void ShowNumber(void)
{
char i;
unsigned long num = CountNum;
unsigned char buff[8];
for(i=0; i<8; i++)
{
buff[i] = num % 10;
num /= 10;
}
for(i=7; i>=1; i--)
{
if(0 == buff[i])
{
LedBuff[i] = 0x00;
}
else
{
break;
}
}
for(; i>=0; i--)
{
LedBuff[i] = DUTable[buff[i]];
}
}
void KeyAction(unsigned char KeyCoder)
{
if((0x26 == KeyCoder) || (0x25 == KeyCoder))
{
if(CountNum < 99999999)
{
CountNum++;
ShowNumber();
}
}
else if((0x28 == KeyCoder) || (0x27 == KeyCoder))
{
if(CountNum > 0)
{
CountNum--;
ShowNumber();
}
}
else if(0x0D == KeyCoder)
{
flagCount = 1;
}
else if(0x1B == KeyCoder)
{
enBuzz = 0;
//P1 = 0xFF;
flagCount = 0;
CountNum = 0;
ShowNumber();
}
}
void KeyDriver(void)
{
unsigned char i,j;
static unsigned char KeyBack[4][4] =
{
{1,1,1,1},{1,1,1,1},{1,1,1,1},{1,1,1,1}
};
static unsigned long pdata KeyTimer[4][4] =
{
{1000,1000,1000,1000},{1000,1000,1000,1000},
{1000,1000,1000,1000},{1000,1000,1000,1000}
};
for(i=0; i<4; i++)
{
for(j=0; j<4; j++)
{
if(KeyStay[i][j] != KeyBack[i][j])
{
if(1 == KeyBack[i][j])
{
P1 = 0x00;
KeyAction(KeyCode[i][j]);
}
else
{
P1 = 0xFF;
}
KeyBack[i][j] = KeyStay[i][j];
}
if(KeyTime[i][j] > 0)
{
if(KeyTime[i][j] >= KeyTimer[i][j])
{
KeyTimer[i][j] += 200;
if((KeyCode[i][j] == 0x26) || (KeyCode[i][j] == 0x28))
{
enBuzz = 1;
KeyAction(KeyCode[i][j]);
enBuzz = 0;
}
}
}
else
{
KeyTimer[i][j] = 1000;
}
}
}
}
void LedScan(void)
{
static unsigned char i = 0;
P0 = 0x00;
DULA = 1;
DULA = 0;
P0 = WETable[i];
WELA = 1;
WELA = 0;
P0 = LedBuff[i];
DULA = 1;
DULA = 0;
i++;
if(i>=8)
{
i = 0;
}
}
void KeyScan(void)
{
unsigned char i;
static unsigned char KeyOut = 0;
static unsigned char KeyBuff[4][4] =
{
{0xF,0xF,0xF,0xF},{0xF,0xF,0xF,0xF},
{0xF,0xF,0xF,0xF},{0xF,0xF,0xF,0xF}
};
KeyBuff[KeyOut][0] = (KeyBuff[KeyOut][0] << 1) | KEYIN1;
KeyBuff[KeyOut][1] = (KeyBuff[KeyOut][1] << 1) | KEYIN2;
KeyBuff[KeyOut][2] = (KeyBuff[KeyOut][2] << 1) | KEYIN3;
KeyBuff[KeyOut][3] = (KeyBuff[KeyOut][3] << 1) | KEYIN4;
for(i=0; i<4; i++)
{
if(0x00 == (KeyBuff[KeyOut][i] & 0x0F))
{
KeyStay[KeyOut][i] = 0;
KeyTime[KeyOut][i] += 4;
}
else if(0x0F == (KeyBuff[KeyOut][i] & 0x0F))
{
KeyStay[KeyOut][i] = 1;
KeyTime[KeyOut][i] = 0;
}
}
KeyOut++;
KeyOut &= 0x3;
switch(KeyOut)
{
case 0 : KEYOUT4 = 1; KEYOUT1 = 0; break;
case 1 : KEYOUT1 = 1; KEYOUT2 = 0; break;
case 2 : KEYOUT2 = 1; KEYOUT3 = 0; break;
case 3 : KEYOUT3 = 1; KEYOUT4 = 0; break;
default : break;
}
}
void BuzzScan(void)
{
if(enBuzz)
{
BUZZER = ~BUZZER;
}
else
{
BUZZER = 1;
}
}
void InterruptTimer0(void) interrupt 1
{
static unsigned int tmr1s = 0;
TH0 = T0RH;
TL0 = T0RL;
LedScan();
KeyScan();
BuzzScan();
if(flagCount)
{
tmr1s++;
if(tmr1s>=1000)
{
tmr1s = 0;
flag1s = 1;
}
}
else
{
tmr1s = 0;
}
}