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ATMEGA16 with Real time clock

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Kaze105

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I am hoping to connect a real time clock to the ATMEGA16. A 32.XX (forgot exact number) Khz crystal oscillator is connected to the ports of TOSC1 and TOSC2.

I am using codevisionAVR to program the ATMEGA16 using a development board.

I am having trouble displaying the time onto the LCD display (which displays other things just fine).

I am hoping someone could help me with the coding for this.

I also do have a DS1672-33 external real time clock, but have yet to use it due to being unsure how to program it properly.

(In simple, hardware connections are just fine, i just need help with the coding using codevision AVR.)
 

Could you post your code rather than simply asking your problem so that everyone can give solution... Timer/Counter2 can be used as asynchronous communication [RTC] by setting AS2 bit in ASSR[Asynchronous status register] register..
 
Here is the code within the main(void)

Code: 
 // Timer/Counter 2 initialization 
 // Clock source: TOSC1 pin 
 // Clock value: PCK2/128 
 // Mode: Output Compare 
 // OC2 output: Disconnected 
 TCCR2=0x05; 
 ASSR=0x08; 
 TCNT2=0x00; 
 OCR2=0x00;

I have it set up with the interrupt with the code below:

Code: 
interrupt [TIM2_OVF] void timer2_ovf_isr(void) 
{  
       if(++time.second > 59)  // if seconds = 60 
 { 
  time.second = 0;  // set seconds to 0 
  if(++time.minute > 59)          // if minutes = 60 
  { 
   time.minute = 0; // set minutes to 0 
   if(++time.hour > 12)    // if hours = 13 
   {   
    if(dayornight == 0) // if AM 
    { 
    dayornight = 1;     // change to PM 
    } 
    else 
    dayornight = 0;     // make AM because already PM         
    time.hour = 1; // change to 1 O'clock 
                        } 
                } 
        } 
    
   /*** Definitions for printf() statements***/ 
   // 20 scroll off so when at bottom row goes to top 
   // 17 set cursor postion 
   // 4 go to column 5 
   // 3 go to row 4 
         
        if (timedisplay == 1) 
          {  
        if (dayornight == 0) 
          { 
        printf("%c%c%c%c%02u:%02u:%02u AM",20,17,4,3,time.hour,time.minute,time.second); 
          } 
            else 
              {   
                printf("%c%c%c%c%02u:%02u:%02u PM",20,17,4,3,time.hour,time.minute,time.second);  
              } 
           } 
            
           if (timedisplayset == 1)    //to display first feeding time set when setting 
          {  
        if (dayornightset == 0) 
          { 
        printf("%c%c%c%c  %02u:%02u AM",20,17,4,3,timeset.hourset,timeset.minuteset); 
          } 
            else 
              {   
                printf("%c%c%c%c  %02u:%02u PM",20,17,4,3,timeset.hourset,timeset.minuteset,);  
              } 
           } 
            
           if (timedisplayset2 == 1) 
          {  
        if (dayornightset2 == 0) 
          { 
        printf("%c%c%c%c  %02u:%02u AM",20,17,4,3,timeset2.hourset2,timeset2.minuteset2,); 
          } 
            else 
              {   
                printf("%c%c%c%c  %02u:%02u PM",20,17,4,3,timeset2.hourset2,timeset2.minuteset2,);  
              } 
           } 
         }

Code is made so that when I enter timedisplay=1; in the main(void), the time will appear on the LCD.
I know the LCD works with other simple printf statements, but when I try this, nothing is displayed onto the LCD.
 

I want to implement digital clk using seven segment display plz help me.............dear's
 

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