按键控制数字加1减1

前面学习了数码管和按键，将两者结合，完成一个用两个按键控制加减数字的小程序，一个按键控制加1另一个控制减1。

#include <reg52.h>



sbit KeyAdd = P0^0; //加1按键

sbit KeyDec = P0^1; //减1按键

sbit LATCH1 = P2^2; //段锁存

sbit LATCH2 = P2^3; //位锁存

unsigned char code DuanMa[10]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f};// 显示段码值0~9

unsigned char code WeiMa[]={0xfe,0xfd,0xfb,0xf7,0xef,0xdf,0xbf,0x7f};//位码

unsigned char TempData[8]; //存储显示值



void Delay(unsigned int t);

void Display(unsigned char FirstBit,unsigned char Num);



void main(void)

{    unsigned char num = 0;

    while (1)

    {

        if (!KeyAdd)        //加1按键有效

        {

            Delay(1500);    //延时去抖 一般10-20ms

            if (!KeyAdd)

            {

                while (!KeyAdd);

                if (num < 9)

                  num++;

            }    

        }



        if (!KeyDec)        //减1按键有效

        {

            Delay(1500);

            if (!KeyDec)

            {

                while (!KeyDec);

                if (num > 0)

                  num--;

            }

        }



        TempData[0] = DuanMa[num % 10];

        Display(0, 1);

    }

}



void Delay(unsigned t)

{

    while(--t);

}



void Display(unsigned char FirstBit,unsigned char Num)

{

    unsigned char i;

      

    for(i = 0; i < Num; i++)

    {

        P1 = 0;   //清空数据，防止有交替重影

        LATCH1 = 1;     //段锁存

        LATCH1 = 0;



        P1 = WeiMa[i + FirstBit]; //取位码 

        LATCH2=1;     //位锁存

        LATCH2=0;



        P1 = TempData[i]; //取显示数据，段码

        LATCH1=1;     //段锁存

        LATCH1=0;

       

        Delay(2000); // 保持显示一段时间

       }

}