51 single-chip microcomputer (AT89S52) one-click multi-function (short and long)

Short Press (Press duration less than 3 S) a digital display plus 1, while the flow lamp count plus 1.

Long press (Press duration greater than 3 S), the digital display per MS plus 1, while the flow lamp per Ms count plus 1.

#include<reg52.h>typedef unsigned char uchar;typedef unsigned int uint;#define NOKEY 0#define KEYDOWN 1#define KEYUP 2uchar keystate;sbit key=P2^7;void keyscan(void);uchar timeflag;uchar code table[]={0x80,0xf2,0x48,0x60,0x32,0x24,0x04,0xf0,0x00,0x20,0x10,0x06,0x8c,0x42,0x0c,0x1c};uchar i;void main(void){TMOD=0x10;TH1=(65536-50000)/256;TL1=(65536-50000)%256;EA=1;ET1=1;TR1=1;while(1){if(timeflag){timeflag=0;keyscan();}}}void keyscan(void){static uchar iscontinue=0;P2 |=0x80;switch(keystate){case NOKEY:if(key==0){keystate=KEYDOWN;return;}else{keystate=NOKEY;return;}case KEYDOWN:if(key==0){keystate=KEYUP;return;}else{keystate=NOKEY;return;}case KEYUP:if(key==0){keystate=KEYUP;iscontinue++;if(iscontinue==255)iscontinue=60;if(iscontinue>=60){if(iscontinue%10==0){P2+=1;P1=table[i++];if(i>=16)i=0;}}return;}else{keystate=NOKEY;if(iscontinue<60){P2+=1;P1=table[i++];if(i>=16)i=0;}iscontinue=0;return;}}}void timer1isr() interrupt 3{TH1=(65536-50000)/256;TL1=(65536-50000)%256;timeflag=1;}