51单片机秒表程序设计有四个按键分别是计次，显示多次计次时间，复位，启停 -

#include<reg52.h>
sbit KEY1 = P3^0; //计次
sbit KEY2 = P3^1; //从快到慢显示计次数
sbit KEY3 = P3^2; //复位
sbit KEY4 = P3^3; //启停秒表
unsigned char code LedChar[] = { //数码管显示字符转换表
0xC0, 0xF9, 0xA4, 0xB0, 0x99, 0x92, 0x82, 0xF8,
0x80, 0x90, 0x88, 0x83, 0xC6, 0xA1, 0x86, 0x8E
};
unsigned char LedBuff[6] = { //数码管显示缓冲区
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF
};
unsigned char KeySta[4] = {1,1,1,1}; //当前按键状态
unsigned char T0RH = 0;
unsigned char T0RL = 0;
bit kd = 0;
bit lk = 1;
bit stopwatchRefresh = 1;
bit stopwatchRunning = 0;
unsigned char DecimalPart = 0;
unsigned int IntegerPart = 0;
void ConfigTimer0(unsigned int ms);
void stopwatchDisplay();
void KeyDriver();
void main()
{
EA = 1;
ConfigTimer0(2);
while(1)
{
if(stopwatchRefresh)
{
stopwatchRefresh = 0;
stopwatchDisplay();
}
KeyDriver();
}
}
void ConfigTimer0(unsigned int ms)
{
unsigned long tmp;
tmp = 11059200/12;
tmp = (tmp*ms)/1000;
tmp = 65536 - tmp;
tmp +=18; //定时误差补偿
T0RH = (unsigned char)(tmp>>8);
T0RL = (unsigned char)tmp;
TMOD &=0xf0;
TMOD |=0X01;
TH0 = T0RH;
TL0 = T0RL;
ET0 = 1;
TR0 = 1;
}
void stopwatchDisplay()
{
signed char i;
unsigned char buf[4];
LedBuff[0] = LedChar[DecimalPart%10];
LedBuff[1] = LedChar[DecimalPart/10];
buf[0] = IntegerPart%10;
buf[1] = IntegerPart/10%10;
buf[2] = IntegerPart/100%10;
buf[3] = IntegerPart/1000%10;
for(i=3;i>=1;i--)
{
if(buf[i]==0)
{
LedBuff[i+2]=0xFF;
}else break;
}
for(;i>=0;i--)
{
LedBuff[i+2] = LedChar[buf[i]];
}
LedBuff[2] &=0x7f;
}
void Stopwatchjc()
{
signed char i;
unsigned char buf[4];
static unsigned char Dec[10] = 0;
static unsigned int Int[10] = 0;
static char cnt = 0;
static char cnt1 = 0;
Dec[cnt] = DecimalPart;
Int[cnt] = IntegerPart;
cnt++;
if(kd == 1)
{
LedBuff[0] = LedChar[Dec[cnt1]%10];
LedBuff[1] = LedChar[Dec[cnt1]/10];
buf[0] = Int[cnt1]%10;
buf[1] = Int[cnt1]/10%10;
buf[2] = Int[cnt1]/100%10;
buf[3] = Int[cnt1]/1000%10;
for(i=3;i>=1;i--)
{
if(buf[i]==0)
{
LedBuff[i+2]=0xFF;
}else break;
}
for(;i>=0;i--)
{
LedBuff[i+2] = LedChar[buf[i]];
}
LedBuff[2] &=0x7f;
cnt1++;
}
}
void Stopwatchsy()
{
stopwatchRunning = 0;
kd = 1;
stopwatchRefresh = 1;
}
void StopwatchAction()
{
stopwatchRunning = ~stopwatchRunning;
}
void StopwatchReset()
{
stopwatchRunning = 0;
lk = 0;
DecimalPart = 0;
IntegerPart = 0;
stopwatchRefresh = 1;
}
void KeyDriver() //按键驱动函数
{
static unsigned char backup[4] = {1,1,1,1}; //按键值备份，保存前一次的扫描值
unsigned char i;
for(i=0;i<4;i++)
{
if (KeySta[i] != backup[i]) //当前值与前次值不相等说明此时按键有动作
{
if (backup[i] == 0) //如果前次值为0，则说明当前是弹起动作
{
if(i==0)
Stopwatchjc(); //计次
else if(i==1)
Stopwatchsy(); //从快到慢
else if(i==2) //复位
StopwatchReset();
else if(i==3) //启停秒表
StopwatchAction();
}
backup[i] = KeySta[i]; //更新备份为当前值，以备进行下次比较
}
}
}
void LedScan()
{
static unsigned char i=0;
P0 = 0xFF;
switch(i) //每过1ms从低到高位刷新一个数码管
{
case 0:P2=0x01;i++; P0= LedBuff[0]; break;
case 1:P2=0x02;i++; P0= LedBuff[1]; break;
case 2:P2=0x04;i++; P0= LedBuff[2]; break;
case 3:P2=0x08;i++; P0= LedBuff[3]; break;
case 4:P2=0x10;i++; P0= LedBuff[4]; break;
case 5:P2=0x20;i=0; P0= LedBuff[5]; break;
default :break;
}
}
void KeyScan()
{
static unsigned char keybuf[4] ={ 0xFF,0xFF,0xFF,0xFF}; //扫描缓冲区，保存一段时间内的扫描值
static unsigned char i=0;
keybuf[0] = (keybuf[0]<<1) | KEY1; //缓冲区左移一位，并将当前扫描值移入最低位
keybuf[1] = (keybuf[1]<<1) | KEY2; //缓冲区左移一位，并将当前扫描值移入最低位
keybuf[2] = (keybuf[2]<<1) | KEY3; //缓冲区左移一位，并将当前扫描值移入最低位
keybuf[3] = (keybuf[3]<<1) | KEY4; //缓冲区左移一位，并将当前扫描值移入最低位
for(i=0;i<4;i++)
{
if (keybuf[i] == 0x00)
{ //连续8次扫描值都为0，即16ms内都只检测到按下状态时，可认为按键已按下
KeySta[i] = 0;
}
else if (keybuf[i] == 0xFF)
{ //连续8次扫描值都为1，即16ms内都只检测到弹起状态时，可认为按键已弹起
KeySta[i] = 1;
}
else
{} //其它情况则说明按键状态尚未稳定，则不对KeySta变量值进行更新
}
}
void StowatchCount()
{
if(stopwatchRunning)
{
DecimalPart++;
if(DecimalPart>=100)
{
DecimalPart=0;
IntegerPart++;
if(IntegerPart>=10000)
{
IntegerPart=0;
}
}
stopwatchRefresh=1;
}
}
void InterruptTimer0() interrupt 1
{
static unsigned char ter10ms = 0;
TH0 = T0RH; //重新加载重载值
TL0 = T0RL;
LedScan(); //数码管扫描显示
KeyScan(); //按键扫描
ter10ms++;
if (ter10ms>=5)
{
ter10ms = 0;
StowatchCount();
}
}

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