1 input 2 output with time delay

[manishb2010]

i have problem with timer access.
my application is like, after detection of input output relay become after set time both relay can set different time. so is it possible to use two timer(timer0 and timer1) in 89s52 at same time?
please suggest me how we can use it.

 

[milesguidon]

If your device has Timer0 and Timer1, you can absolutely use them independently.

Or, you can set up two software-based timers, that get their value from only only one of the timer modules. You can write firmware to use Timer0 to control many different actions/outputs, not just one output. For example, if you want to take "Action A" 250ms after the correct input is detected, but then take "Action B" 700ms after input is detected--you don't need two timers. Just set up Timer0 to be free-running, and then when your counter variable based on Timer0 (or whatever you decide) reaches 250ms, trigger "Action A", and then when it reaches 700ms, trigger "Action B".

 

[manishb2010]

thanking you for replying.
i want to use timer 1 for count down operation for which i had prepared following code ,but after detection of input signal the count down timer will not start, please suggest me what is the mistake.

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Code C - [expand]
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#include<regx52.h>
#include<stdio.h>
#include<string.h>
#include <intrins.h>
#include <stdlib.h>
#define ldata P0
sbit d7 = P0^7;
sbit rs = P2^0;
sbit rw = P2^1;
sbit en = P2^2;
sbit save=P2^7;
sbit sclk = P2^5;
sbit sda = P2^6;   
sbit start = P1^0;
sbit inc = P1^1;
sbit dec = P1^2;
sbit enter = P1^3;
//sbit v1 = P3^4;
sbit v2 = P3^5;
sbit l1 = P3^0;
 
unsigned char b[16];
unsigned char high2,low2,tik2;
float newvalue2, dummytimer2;
unsigned int timer12, timer22; 
void lcddata2(unsigned char);
void lcdcmd2(unsigned char);
void msdelay2(unsigned int);                          // 0xC0 for 2nd line and 0x80 for 1st line
void numdis2(unsigned char, unsigned int);
void num2(unsigned char, float);
void numwhole2(unsigned char, unsigned int);
void strwrt2(unsigned char, unsigned char *);
void wait_lcd2();
void clearb2();
void in2();
void start_s_eeprom2();
void send_byte_s_eeprom2(char);
char get_byte_s_eeprom2();
void stop_s_eeprom2();
void send_to_mem2(char, char);
unsigned int get_from_mem2(char);
void wait2();
void acknowledge2();
void set_para2();
void start_cycle2();
void start_cycle22();
void test_mode2();
void main()
{
    in2();
    lcdcmd2(0X38);
    lcdcmd2(0X0C);
    lcdcmd2(0X01);
    strwrt2(0x80,"  ------ ");              //welcome message for some time
    strwrt2(0xc0,"   -----   ");
    msdelay2(500);
    strwrt2(0x80,"  Give signal     ");
    clearb2();
    while(1)
    {
        if(start == 0)
        {
            set_para2();
        }
        if(l1 == 0 )
 
        {
            
            start_cycle2();
 
    
        }
    
    }
 
 
}
void set_para2()
{
    strwrt2(0x80,"Set R2 ON Time  ");
    clearb2();
    numdis2(0xC0,timer12);
    timer12 = newvalue2*10;
    high2 = timer12 >> 8;
    low2 = timer12;
    send_to_mem2(0x00, high2);
    msdelay2(10);
    send_to_mem2(0x01, low2);
    msdelay2(300);
 
            
    strwrt2(0x80," Test Mode       ");
    clearb2();
    while(enter)
    {
        if(start == 0)
        {
            test_mode2();
            break;  
        }
    }
 
    v2 = 1;
 
    strwrt2(0x80," Give Signal    ");
    clearb2();
    while(start == 0);  
    msdelay2(20);
}
void start_cycle2()
{
 
     v2 = 0;
     strwrt2(0x80,"R2 ON          ");
     msdelay2(200);
    if (l1 == 1 )
    {
    start_cycle22();
    }
 
}
void start_cycle22()
{
     float temp2;
    strwrt2(0x80,"R2 ON T- ");
    clearb2();
    tik2 = 0;
    TH1 = 0x5D;
    TL1 = 0x3D;
    dummytimer2 = timer12/10.0;
    temp2 = dummytimer2;
  //    v1 = 0;
    TR1 = 1;
    num2(0x89,dummytimer2);
    while(dummytimer2>=0)           
    {
        if(temp2 !=dummytimer2)
        {
            num2(0x89,dummytimer2);
            temp2 = dummytimer2;    
        }
            }
    TR1 = 0;
    v2 = 1;
 
 
       
      //v2 = 1;
      strwrt2(0x80," Give Signal     ");
        clearb2();
 
    }               
 
void test_mode2()
{
    unsigned int i = 0;
    strwrt2(0x80,"                ");   
    clearb2();
    strwrt2(0x80,"V1=Off");
//  strwrt(0x88,"V2=Off");
//  strwrt(0xc0,"V2=Off");
//  strwrt(0xc8,"V3=Off");
    while(start == 0);
    msdelay2(20);
    while(1)
    {
        if(start == 0)  
        {
 
            v2=0;
        //  motor = 0;
            strwrt2(0x80,"V1=On ");
            msdelay2(100);
            while(start == 0)
            {
                while(enter == 0)
                {
                    i++;
                    msdelay2(1);
                    if(i == 500)
                    {
                        return;
                    }
                }
                i = 0;
            }
             v2=1;
        //  motor = 1;
            strwrt2(0x80,"V1=Off");
            msdelay2(20);
        }
        
 
        }        
 
}
void in2()
{
    //P3 = 0xF0;
    l1 =1;
//  l2=1;
//  l3=1;
    P2 = 0X00;
//  P1 = 0X1F;
 
//  l4 = 1;
//  l5_start =1;
//  l6_stop = 1;
 
    P0 = 0X00;
    TMOD = 0X11;
//  IE = 0X82;
    IE = 0x88;
 
 
 
 
    TR1 = 0;
    high2 = get_from_mem2(0x00);
    low2 = get_from_mem2(0x01);
    timer12=(high2<<8)|low2;
 
}
 
void msdelay2(unsigned int value)
{
    unsigned int i,j,temp;
    temp = value;
    for(i=0; i<=temp; i++)
        for(j=0; j<=200; j++);
}
void lcddata2(unsigned char value)
{
    wait_lcd2();
    ldata = value;
    rs = 1;
    rw = 0;
    en = 1;
    en = 0;
}
void lcdcmd2(unsigned char value)
{
    wait_lcd2();
    ldata= value;
    rs = 0;
    rw = 0;
    en = 1;
    en = 0;
}
 
void wait_lcd2()
{
    en = 0;
    d7 = 1;
    rs = 0;
    rw = 1;
    while(d7 == 1)
    {
        en = 0;
        en = 1;
    }
}
void numdis2(unsigned char value, unsigned int num)
{
    unsigned char i;
    unsigned char d[4];
    sprintf(d, "%4d", num);
    for(i = 0; i < 4; i++)
    {
        if(d[i] <= 48)
            d[i] = 48;
    }
    lcdcmd2(value);
    d[0] = d[1];           //start formating 
    lcddata2(d[0]);
    d[1] = d[2];
    lcddata2(d[1]);
    d[2] = 46;
    lcddata2(d[2]);
    lcddata2(d[3]);       //finish reformat
    lcdcmd2(value);
    lcdcmd2(0x0F);
    for(i = 0; i < strlen(d); i++)
    {
        while(dec== 1 && d[i] != 46)
        {
            if(inc == 0 && d[i] != 46)
            {
                if(d[i] == 57)
                {
                    d[i] = 47;
                }
                d[i]++;
                lcddata2(d[i]);
                lcdcmd2(0x10);
                msdelay2(300);
            }       
        }
        msdelay2(300);
        lcdcmd2(0x14);
    }
    newvalue2 = atof (d);
}
void strwrt2(unsigned char value, unsigned char *str)
{
    unsigned int i;
    lcdcmd2(value);
    for(i = 0; i < strlen(str); i++)
    {
        lcddata2(str[i]);
    }
}
void num2(unsigned char value, float num)
{
    unsigned char c[4];
    char i;
    lcdcmd2(0x0C);
    lcdcmd2(value);
    sprintf(c, "%4f", num);
    for(i = 0; i < 4; i++)
    {
        if(num <= 10)
            c[3] = 48;
        lcddata2(c[i]);
    }
}
void numwhole2(unsigned char value, unsigned int num)
{
    unsigned char c[4];
    char i;
    lcdcmd2(0x0C);
    lcdcmd2(value);
    sprintf(c, "%4d", num);
    for(i = 0; i < 4; i++)
    {
        lcddata2(c[i]);
    }
}
void clearb2()
{
    strwrt2(0xc0, "                ");  
}
/* eeprom functions */
 void send_to_mem2(char s_address, char s_data)
 {
   
    start_s_eeprom2();             // sending start condition to eeprom 
    send_byte_s_eeprom2(0XA0);     // A0 = 10100000 = sending device address word for write
    acknowledge2();
    send_byte_s_eeprom2(s_address); // sending data address
    acknowledge2();
    send_byte_s_eeprom2(s_data);   // sending data 
    acknowledge2();
    stop_s_eeprom2();              // sending stop condition to eeprom
   acknowledge2();
   return;  
 }
 unsigned int get_from_mem2(char s_address)
 {
    char i = 0;
//-------dummy write seq----+ word address------------------------------------
    start_s_eeprom2();             // sending start condition to eeprom 
    send_byte_s_eeprom2(0XA0);     // sending A0 = 10100000 = device address word for write
    acknowledge2();
    send_byte_s_eeprom2(s_address); // sending data address
    acknowledge2();
//----------------dummy over----------------------------------------------------
    start_s_eeprom2();
    send_byte_s_eeprom2(0XA1);     // sending A1 =10100001 = device adress word for read
    acknowledge2();
    i = get_byte_s_eeprom2(); // sending data 
    acknowledge2();
    stop_s_eeprom2();              // sending stop condition to eeprom
    acknowledge2();
    return(i); 
 }
 void send_byte_s_eeprom2(char s_byte)
 {
    char temp2 = s_byte;
    char i ;
    for(i = 7 ; i >= 0 ; i--)
    {
        temp2 = s_byte;
        temp2 = temp2 >> i;
        temp2 = temp2 & 0X01;
        if(temp2 == 0)
            sda =   0;
        else
            sda =   1;
            sclk   =   1;
            wait2();
            sclk   =   0; 
    }
   return;
 }
 char get_byte_s_eeprom2()
 {
    char temp2, temp_h2, i;
    temp2=0;
    temp_h2=1;   
    sda=1;    // making SDA as input pin for microcontroller
    sclk=0;
    for(i = 7; i >=0 ; i--)
    {
     sclk = 1;
      if(sda == 1)
        {
            temp2 = temp2 | temp_h2<<i ;                      
        }
        wait2();
      sclk = 0;
    }
    sclk = 0;
    return(temp2);
 }
 void start_s_eeprom2()
 {
    sda=1;
    sclk=1;
    wait2();
   sda=0;
   sclk=0;  
   return; 
 }
 void stop_s_eeprom2()
 {
    sda=0;
    sclk=1;
    wait2();
    sda=1;
    sclk=0;
   return;   
 }
 void acknowledge2()
 {
   sclk=1;
   wait2();
   sclk=0;
   return;
 }
 void wait2()
 {
    char i;
    for(i=0;i<=20;i++)
      i++;
    return;
 }
void timer1(void) interrupt 3
{
    TH1 = 0x5D;
    TL1 = 0x3D;
    TR1 = 1;
    tik2++;
    if(tik2 == 4)
    {
        dummytimer2 = dummytimer2-0.1;
        tik2 = 0;
    }

---

 

[milesguidon]

There are a lot of unknowns, here. Try verifying separately that your signal is reliably being detected, by triggering something besides Timer1, like pulling an I/O port high, or triggering an LED when the signal is detected. You may have a problem with detecting a signal. Once you've verified that your microcontroller is truly detecting a signal, then you can move on. After that, verify separately that you can control Timer1 reliably.

The problem is not that "Timer1 cannot be triggered when a signal is detected"--your problem is either that you are not reliably detecting a signal, or that you have not written the correct code to trigger Timer1.

 

[manishb2010]

Dear Bro.

i had already tested for timer0, its working ok.
But i think that for timer1 there is mistake in interrupt or loading of data. I have to use both timer0 and 1 perallaly thats y i required it. I am waiting for your replay.

 

[RAJ BHALAKIYA]

why you not use new saperate prototype function (like delay)for it.