51单片机状态机键盘检测

#include<reg52.h>

#define uint unsigned int

#define uchar unsigned char

sbit key1=P3^2;

typedef enum keystate{initstate,affirmstate,singlestate,repeatstate};// typedef enum±íʾ¶¨ÒåÁËÒ»¸öö¾ÙÐ͵ÄÊý¾Ý½á¹¹ ²»¸³ÖµµÄ»° ĬÈÏ {0 1 2 3}

  // ³õʼ״̬£¬È·ÈÏ״̬£¬µ¥´Î´¥·¢×´Ì¬£¬Á¬Ðø´¥·¢×´Ì¬

typedef enum ledstate{D0,D1,D2,D3,D4,D5,D6,D7,D8};//Á÷Ë®µÆ8¸ö״̬ 0 1 2 3 4 5 6 7

void time0init()//¶¨Ê±Æ÷T0³õʼ»¯

{

    TMOD=0X01;           //T0·½Ê½1

    TH0=(65536-10000)/256;//³õÖµ10ms

    TL0=(65536-10000)%256;

    TR0=1;   //Æô¶¯¶¨Ê±Æ÷0

    EA=1;   //¿ª×ÜÖжÏ

    ET0=1;//¿ªÆô¶¨Ê±Æ÷0

}

/*Ï£Íûº¯ÊýÖеľֲ¿±äÁ¿µÄÖµÔÚº¯Êýµ÷ÓýáÊøºó²»Ïûʧ¶ø±£ÁôÔ­Öµ,

¼´ÆäÕ¼ÓõĴ洢µ¥Ôª²»ÊÍ·Å,ÔÚÏÂÒ»´Îº¯Êýµ÷ÓÃʱ,¸Ã±äÁ¿ÒÑÓÐÖµ,

¾ÍÊÇÉÏÒ»´Îº¯Êýµ÷ÓýáÊøʱµÄÖµ.

ÕâÊǾÍÓ¦¸ÃÖ¸¶¨¸Ã¾Ö²¿±äÁ¿Îª"¾Ö²¿¾²Ì¬±äÁ¿",ÓÃstatic¼ÓÒÔ˵Ã÷*/

uchar keyscan(void)  //°´¼üɨÃ躯Êý

{

    staticuchar keystatevalue=0;  //°´¼ü״ֵ̬  ¼ÓStaticÑÓ³¤Ê±¼äÖÜÆÚ×÷ÓÃÓò²»±ä

    staticuchar presstime=0;   //

     uchar key_value;                //°´¼ü״ֵ̬

    uchar num;

    key_value=key1;                 //¶ÁÈ¡°´¼ü״ֵ̬£¨0 1£©

    switch(keystatevalue)

    {

    case initstate:          //³õʼ״̬

        if(key_value==0)       //˵Ã÷°´¼ü°´ÏÂ

        {keystatevalue=affirmstate;}//¼ÈÈ»°´¼ü°´Ï ¾Í±ä³ÉÈ·ÈÏ״̬

        else

        {keystatevalue=initstate;}//·ñÔò»¹Êdzõʼ״̬

        break;

    case affirmstate://È·ÈÏ״̬

        if(key_value==0)

        {

        keystatevalue=singlestate; //±äΪµ¥´Î´¥·¢×´Ì¬

        }

        else

        {

        keystatevalue=initstate;  // ¶¶¶¯Ã»ÓÐÏû³ýÍí£¬½øÈë³õʼ״̬

        }

        break;

   case singlestate:              //µ¥´Î´¥·¢×´Ì¬

        presstime++;               //Óö¨Ê±Æ÷ ÿ¹ý10ms¼Ó1´Î

        if(presstime>100)          //ʱ¼ä´óÓÚ1S  Çл»µ½Á¬·¢×´Ì¬

        {

        presstime=0;

        keystatevalue=repeatstate;  //״̬Çл»µ½Á¬·¢

        }

        else if(key_value==1)           //ʱ¼äСÓÚ1S²¢ÇÒÈç¹û°´¼üÊÍ·Å

        {

        keystatevalue=initstate;

        num++;    //µÆµÄ±ä»¯

        if(num==8)

        {

        num=0;

        }

        }

        break;

case repeatstate:  //Á¬Ðø´¥·¢×´Ì¬

        if(key_value==1)   //Èç¹û°´¼üÊͷžͽøÈë³õʼ״̬

        {

        keystatevalue=initstate;

        }

        presstime++;

        if(presstime>10)//ÿ¹ý100msÁ¬·¢Ò»´Î

        {

        presstime=0;

        num++;

        if(num==8)

        {

        num=0;

        }

        }

        break;

        default: keystatevalue=initstate; break;

 }

       return num;

}

void keypress() //°´¼ü´¦Àíº¯Êý

{

    uchar keynum; //ÓÃÓÚ¶ÁÈ¡°´¼üɨÃèµÄ·µ»ØÖµ

    if(TF0)//TF0=1ÓÐÒç³ö,˵Ã÷10msʱ¼äµ½

    {

        TF0=0;

        TH0=(65536-10000)/256;//ÖØ×°³õÖµ

        TL0=(65536-10000)%256;//ÖØ×°³õÖµ

        keynum=keyscan();//¶ÁÈ¡°´¼üɨÃèµÄ·µ»ØÖµ£¬Ò²¾ÍÊÇ°´¼ü°´ÏÂʱµÄ²Ù×÷Öµ

    }

    switch(keynum)//¶Áµ½keynumµÄÖµ ÓÃÓÚÅжÏÄĸöָʾµÆÁÁ

    {

        case D0: P0=0XFE;break;

        case D1: P0=0XFD;break;

        case D2: P0=0XFB;break;

        case D3: P0=0XF7;break;

        case D4: P0=0XEF;break;

        case D5: P0=0XDF;break;

        case D6: P0=0XBF;break;

        case D7: P0=0X7F;break;

        default: P0=0XFF;break;

    }

}

void main(void)

{

    time0init();

    while(1)

    {

       keypress();

    }

}