题目:
数码管后三位显示计数值count,范围是0~999
若S4按下,计数值加一,长按1s后,计数值一直加;
若S5按下,计数值减一,长按1s后,计数值一直减;
若S6按下,计数值清零。
代码如下:
#include "STC15F2K60S2.h"
#include "intrins.h"
#define uchar unsigned char
#define uint unsigned int
uchar segCode[25]={
0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90, //0~9的段码(不带小数点)
0x40,0x79,0x24,0x30,0x19,0x12,0x02,0x78,0x00,0x10,0xff}; //0.~9.的段码(带小数点) 以及0xff全灭
uchar segVal[]={
20,20,20,20,20,20,20,20}; //数码管初始化显示1 2 3 4 1. 2. 3. 4.
sbit S6 = P3^1;
sbit S5 = P3^2;
sbit S4 = P3^3;
bit s4Flag=0;
bit s5Flag=0;
uint count=0;//计数值初始值0
uchar keySta[] = {
1,1,1}; //当前按键状态
uchar keyBack[] = {
1,1,1};//按键值备份,保存前一次的值(上一次的按键状态)
uchar keyBuf[] = {
0xff,0xff,0xff};
void SelectHC573(uchar val)
{
switch(val)
{
case 4 : P2 = (P2 & 0x1f) | 0x80; break;
case 5 : P2 = (P2 & 0x1f) | 0xa0; break;
case 6 : P2 = (P2 & 0x1f) | 0xc0; break;
case 7 : P2 = (P2 & 0x1f) | 0xe0; break;
default: P2 = (P2 & 0x1f); break;
}
}
void InitSystem()//系统初始化关闭蜂鸣器、继电器、LED
{
SelectHC573(5);
P0 = 0xbf; //由于不同板子的引脚接法不同,此时的初始值也不同
SelectHC573(4);
P0 = 0xff; //LED全灭
}
void Timer0Init(void) //1毫秒@12.000MHz
{
AUXR &= 0x7F; //定时器时钟12T模式
TMOD &= 0xF0; //设置定时器模式
TL0 = 0x18; //设置定时初值
TH0 = 0xFC; //设置定时初值
TF0 = 0; //清除TF0标志
TR0 = 1; //定时器0开始计时
ET0 = 1;
EA = 1;
}
uchar segFlag = 0;
uint count1s=0;
void ServiceTimer0() interrupt 1
{
uchar pushp0,pushp2,k;
pushp0 = P0;//保护P0、P2值不被中断所影响
pushp2 = P2;
//数码管
SelectHC573(6);
P0 = (0x01<<segFlag);
SelectHC573(7);
P0 = segCode[segVal[segFlag]];
segFlag++;
if(segFlag == 8) segFlag = 0;
//按键检测
keyBuf[0] = (keyBuf[0]<<1) | S4;
keyBuf[1] = (keyBuf[1]<<1) | S5;
keyBuf[2] = (keyBuf[2]<<1) | S6;
for(k=0; k<3; k++)
{
if(keyBuf[k] == 0x00)
keySta[k] = 0;
else if(keyBuf[k] == 0xff)
keySta[k] = 1;
}
//1s
if(s4Flag == 1 || s5Flag==1)//如果s4或s5按下,启动1s定时
{
count1s++;
if(count1s>2000) //为了防止按下时间太长,导致count1s溢出
count1s=2000;
}
else
count1s=0;
P2 = pushp2;
P0 = pushp0;
}
void Delay100ms() //@12.000MHz
{
unsigned char i, j, k;
_nop_();
_nop_();
i = 5;
j = 144;
k = 71;
do
{
do
{
while (--k);
} while (--j);
} while (--i);
}
void main()
{
InitSystem();
Timer0Init();
while(1)
{
segVal[5] = count/100;
segVal[6] = count%100/10;
segVal[7] = count%10;
//如果S4按下,计数值count加一,长按(大于一秒)计数值count持续加
if(keySta[0] != keyBack[0]) //当前值与前次值不相等说明此时按键有动作(按下或弹起)
{
if(keySta[0] == 0) //如果这一次值为 0,则说明当前是按下动作
{
s4Flag=1; //启动1s定时
while(keySta[0] == 0) //如果按键没有松开,即一直在按下
{
if(count1s>1000) //如果按键按下时间大于1s
{
if(count==999) //计数值最大999,当加到999的时候,不再增加
count=999;
else
count++; //计数值持续加
segVal[5] = count/100;
segVal[6] = count%100/10;
segVal[7] = count%10;
Delay100ms(); //这个一定要加上,具体时间可按要求调节,否则会影响数码管显示,计数值很快就会达到阈值
}
}
if(count1s<=1000) //按键时间小于1s,为短按,计数值加1
{
if(count==999) //计数值最大999,当加到999的时候,不再增加
count=999;
else
count++; //计数值加一
segVal[5] = count/100;
segVal[6] = count%100/10;
segVal[7] = count%10;
}
s4Flag=0; //按键松开,关闭1s定时
}
keyBack[0] = keySta[0];
}
//如果S5按下,计数值count减一,长按(大于一秒)计数值count持续减(原理和按键S4一样)
if(keySta[1] != keyBack[1])
{
if(keySta[1] == 0)
{
s5Flag=1;
while(keySta[1]==0)
{
if(count1s>1000)
{
if(count==0)
count=0;
else
count--;
segVal[5] = count/100;
segVal[6] = count%100/10;
segVal[7] = count%10;
Delay100ms();
}
}
if(count1s<=1000)
{
if(count==0)
count=0;
else
count--;
segVal[5] = count/100;
segVal[6] = count%100/10;
segVal[7] = count%10;
}
s5Flag=0;
}
keyBack[1] = keySta[1];
}
//如果S6按下,计数值count清零
if(keySta[2] != keyBack[2])
{
if(keySta[2] == 0)
{
count=0;
}
keyBack[2] = keySta[2];
}
}
}