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Timer application example source code

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#include "stdio.h"
#include "reg51.h"

// 0 - 9 encoding
unsigned char code table[] = { 0x11,0xb7,0x29,0x23,0x87,0x43,0x41,0x37,0x01,0x03,0x00 } ;
unsigned int count2 ;

//第1－6 位的片选线
unsigned char code dig[] = { 0x7f,0xfd,0xdf,0xf7,0xef,0xfb } ;
unsigned char buffer[8],val[6] ;
unsigned char count1,scan,i,ch,KeyVal,modify,OverTime ;
bit fKey,fSec,Key1,Key2,Key3,OldKey1,OldKey2,OldKey3,blink,fTimer,fSTOP ;
unsigned long int cn,tmp ;

void init(void) ; 
void display(void) ;
void Cal_cn(void) ;
void Cal_val(void) ;

main()
{
heat() ;


while(1) {


if(fSec) { // Is the second flag set?
fSec = 0 ; // Clear the second flagif
(!fSTOP && modify==0) {
if(cn!=0) cn-- ; else { fTimer = 1 ; fSTOP = 1 ; }
}
display() ;
}


if(fKey) { // Is a key pressed?
fKey = 0 ; // Clear the key flag and process the key

if(KeyVal==1) { // Is it an adjustment button?
fSTOP = 0 ; modify++ ; // Enter the corresponding state and reset the timeout timer
if(modify==7) { modify = 0 ; OverTime = 0 ; } else OverTime = 10 ;
}

if(KeyVal==2 && modify!=0) { // ＋1 button, corresponding bit ＋1
Cal_val() ;
if(val[modify-1]<9) val[modify-1]++ ;
Cal_cn() ;
display() ; OverTime = 10 ; // Refresh the display and reset the timeout timer
}

if(KeyVal==3 && modify!=0) { // -1 button, corresponding bit -1
Cal_val() ;
if(val[modify-1]>0) val[modify-1]-- ;
Cal_cn() ;
display() ; OverTime = 10 ; // Refresh the display and reset the timeout timer
}

}

}
}

void init(void) {

count1 = count2 = 0 ; scan = 0 ; KeyVal = 0 ;
cn = 0 ; for(i=0 ;i<6 ;i++) val = 0 ;
fKey = 0 ; modify = 0 ; blink = 0 ; OverTime = 0 ; fTimer = 0 ; fSTOP = 0 ;
Key1 = Key2 = Key3 = 0 ;
OldKey1 = OldKey2 = OldKey3 = 1 ;

for(i=0 ;i<6 ;i++) buffer = 0 ;

TCON &= 0xCF ; // Initialize Timer0
TMOD &= 0xF0 ; 
TMOD |= 0x01 ; 
TH0 = TL0 = 0 ; 
EA = 1 ;
ET0 = 1 ;
TR0 = 1 ;

}


timerint () interrupt 1 {

TR0 = 0 ;
TL0 = 0x12 ;
TH0 = 0xf7 ; // 0xf712 for 2.5ms
TR0 = 1 ;


if(scan==1 && !fKey) { // Scan adjustment button
Key1 = P30 ;
if(!Key1 && OldKey1) { fKey = 1 ; KeyVal = 1 ; }
}


if(scan==3 && !fKey) { // Scan +1 button
Key2 = P30 ;
if(!Key2 && OldKey2) { fKey = 1 ; KeyVal = 2 ; }
}

if(scan==4 && !fKey) { // Scan -1 button
Key3 = P30 ;
if(!Key3 && OldKey3) { fKey = 1 ; KeyVal = 3 ; }
}

OldKey1 = Key1 ; OldKey2 = Key2 ; OldKey3 = Key3 ;


P1 = 0xff ; P3 = dig[scan] ;
ch = buffer[scan] ; // Display 6 digits in sequence

if(modify==0) {
if(fTimer) P1 = table[ch] & 0xfe ; // 倒计时结束，启动P10（P10低电平）
else P1 = table[ch] ;
}
else if(modify==1 && blink && scan==0) P1 = 0xff ;
else if(modify==2 && blink && scan==1) P1 = 0xff ;
else if(modify==3 && blink && scan==2) P1 = 0xff ; 
else if(modify==4 && blink && scan==3) P1 = 0xff ; 
else if(modify==5 && blink && scan==4) P1 = 0xff ;
else if(modify==6 && blink && scan==5) P1 = 0xff ;
else P1 = table[ch] ;

scan++ ; if(scan==6) scan = 0 ;

count1++ ;
if(count1==200) { count1 = 0 ; blink = ~blink ; } // 0.5s blinking timer

count2++ ; 
if(count2==400) {
count2 = 0 ; fSec = 1 ; fTimer = 0 ; // Set the second pulse flag and turn off P10 output

if(OverTime) { OverTime-- ; if(OverTime==0) modify = 0 ; } // 10s timeout timer

}

}

void Cal_cn(void) {

cn = 0 ;
for(i=0 ;i<6 ;i++) {
cn *= 10 ; cn += val ;
}

}

void Cal_val(void) {

tmp = cn ;
for(i=0 ;i<6 ;i++) {
val[5-i] =(unsigned char) ( tmp % 10 ) ;
tmp = tmp / 10 ;
}

}

void display(void) {

tmp = cn ;
for(i=0 ;i<6 ;i++) {
buffer[5-i] =(unsigned char) ( tmp % 10 ) ;
tmp = tmp / 10 ;
}

}


Keywords：Timer Reference address：Timer application example source code

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