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You are here: Home / Topics / how to reset time in lcd using interrupt(using 89s52 microcontroller)

how to reset time in lcd using interrupt(using 89s52 microcontroller)

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Microcontroller › 8051 › how to reset time in lcd using interrupt(using 89s52 microcontroller)

  • This topic has 0 replies, 1 voice, and was last updated 13 years, 5 months ago by manohar.
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    Posts
  • November 20, 2011 at 1:26 pm #1408
    manohar
    Participant

    sir i got output to display time in lcd using 89s52.but i need the help whenever i press the switch in the board the time will start from beginning using external interrupt.
    here is the code how to modify the code.

    #include<reg51.h>
    #define cont_port P3
    #define port P1
    #define dataport P2 // Data port for LCD
    #define m_sec 10
    sbit rs = cont_port^0;
    sbit rw = cont_port^1;
    sbit en = cont_port^6;
    sbit dig_hr1=port^0;
    sbit dig_min1=port^1;
    sbit start=port^2;
    sbit am_pm=port^3;
    int hr ,hr1=0;
    int min,min1=0;
    int sec,sec1=0,dig_am_pm=0;

    void delay(unsigned int msec) // Time delay funtion
    {
    int i,j ;
    for(i=0;i<msec;i++)
    for(j=0;j<1275;j++);
    }

    void lcd_cmd(unsigned char item) // Function to send command on LCD
    {
    dataport = item;
    rs= 0;
    rw=0;
    en=1;
    delay(1);
    en=0;
    return;
    }

    void lcd_data(unsigned char item) // Function to send data on LCD
    {
    dataport = item;
    rs= 1;
    rw=0;
    en=1;
    delay(1);
    en=0;
    return;
    }

    void lcd_data_string(unsigned char *str) // Function to send string on LCD
    {
    int i=0;
    while(str!=’’)
    {
    lcd_data(str
    );
    i++;
    delay(1);
    }
    return;
    }

    lcd_data_int(int time_val) // Function to send number on LCD
    {
    int int_amt;
    int_amt=time_val/10;
    lcd_data(int_amt+48);
    int_amt=time_val;
    lcd_data(int_amt+48);
    }

    void lcd(unsigned char str1[10]) // Function to initialize LCD
    {
    lcd_cmd(0x38); //2 LINE, 5X7 MATRIX
    lcd_cmd(0x0e); //DISPLAY ON, CURSOR BLINKING
    delay(m_sec);
    lcd_data_string(str1);
    }

    void set_hr1() // Function to set hour
    {
    hr1++;
    if(hr1>11)
    hr1=0;
    lcd_cmd(0xc3);
    lcd_data_int(hr1);
    lcd_data(‘:’);
    }

    void set_min1() // Function to set minute
    {
    min1++;
    if(min1>59)
    min1=0;
    lcd_cmd(0xc6);
    lcd_data_int(min1);
    }

    void main()
    {
    int k;
    start=1;
    dig_hr1=1;
    dig_min1=1;
    lcd_cmd(0x01);
    lcd_cmd(0x83);
    lcd(“SET TIMING”);
    lcd_cmd(0xc3);
    lcd_data_int(hr1);
    lcd_data(‘:’);
    lcd_data_int(min1);
    while(start==0)
    {
    delay(10);
    if(dig_hr1==0)
    set_hr1();
    if(dig_min1==0)
    set_min1();
    }

    if(am_pm==0)
    {
    lcd_cmd(0xc8);
    lcd_data_string(“am”);
    dig_am_pm=0;
    }

    if(am_pm==1)
    {
    lcd_cmd(0xc8);
    lcd_data_string(“pm”);
    dig_am_pm=1;
    }
    delay(200);
    lcd_cmd(0x01);
    while(1)
    {
    for(k=0;k<2;k++)
    {
    for(hr=hr1;hr<12;hr++)
    {
    for(min=min1;min<60;min++)
    {
    for(sec=0;sec<60;sec++)
    {
    lcd_cmd(0x82);
    delay(1);
    lcd_data_int(hr);
    lcd_data(‘:’);
    lcd_data_int(min);
    lcd_data(‘:’);
    lcd_data_int(sec);
    if(dig_am_pm==0)
    {
    lcd(“am”);
    }
    else
    {
    lcd(“pm”);
    }
    lcd_data_string(” “);
    delay(100);
    }
    }
    min1=0;
    }
    if(dig_am_pm==0)
    dig_am_pm=1;
    else
    dig_am_pm=0;
    hr1=0;
    }
    }
    }

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