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();

}

}