[avr-gcc-list] Help with interupt

[Michael Hadianto]

Hi all,

I have problem using interupt, i using avrgcc function SIGNAL
(SIG_OVERFLOW0)
but i have problem using it. I'am trying to use the function as time.
this is my program :


SIGNAL (SIG_OVERFLOW0)                  
{                                       
  if (0x0000 == --time.t_count)         
  {                                     
    if ( 60 == ++time.sec )             
    {                                   
      if ( 60 == ++time.min )           
      {                                 
        if ( 24 == ++time.hour )        
        {                               
         time.hour = 0x00;              
        }                               
        time.min = 0x00;                
      }                                 
      time.sec = 0x00;                  
    }                                   
                                        
    time.t_count = 27;                  
    // Testing                          
    if (time.sec % 2)                 
      CLRBIT(PORTC,(LED3));             
    else                              
        SETBIT(PORTC,(LED3));           
  }                                     
}                   


this program works perfectly, and my led is blinking !
but in my main program won't start at all !, it keeps looping
in the first line. Here my init and i'm using AT90S8535 and
using clock 7.372 Mhz :


void Setup(void)
{
// definition of PWM, Ports, UART and Real-Time-Clock
  TCCR1A  = 0xA1;         // define timer1 as 8-bit PWM  
  TIFR    = 0x04;         // clear counter1 overflow flag  
  TIMSK   = 0x04;         // enable counter1 overflow interrupt
  TCNT1   = 0x00;         // set counter1 to zero      
  TCCR1B  = 0x00;         // PWM disabLED       
  
  
  TCCR0 = 0x05;           // Timer0 enabled, divide by 1024
  sbi(TIMSK, 0);          // Enable TCNT0 TOF interrupt

  PORTA  = 0x00;                //prepare port A as analog input
  DDRA   = 0x00;                // no pull ups
  
  PORTC   = 0x1F;         // Prepare Port C0-C4 as input and C5-C7
  DDRC    = 0xE0;         // as output (LED)
       
  PORTB   = 0x03;       // prepare port B0-B1 as ouput (LED) 
  DDRB    = 0x03;      
                        
  
  PORTD   = 0xFF;         // Turn on internal pull-ups for PORTD 
  
  ADCSR=0x86;         // Single A/D conversion, fCK/64 

  CHARGE_STATUS = 0x00;
  
  time.sec = 0x00;
  time.min = 0x00;
  time.hour = 0x00;
  time.t_count = 27;
  
  UART_CONTROL_REG = 0x08;
  UBRR = 0x03;
  sei();               // global interrupt enable 
}    

and this in my main program (not all) 

int main(void)
{       
         Setup();
         putstr("SMART BATTERY CHARGER NiMh");   
    for (;;)
    {    
       SETBIT(CHARGE_STATUS,FAST);
        TERMINATION = 0x00;   
       SETBIT(PORTB,(LED0+LED1+LED2));// Turn all LEDs off    
        SETBIT(PORTC,(LED3+LED4));                    
        while ((PINC & (1<<PC4)));          // Wait until start pushed          
                  
        while (!(CHKBIT(CHARGE_STATUS,ERROR)))
        {      
            if ((CHKBIT(CHARGE_STATUS,FAST)) &&
(!(CHKBIT(CHARGE_STATUS,ERROR))))
            {                                
                CLRBIT(PORTB,LED2);                             
                TERMINATION = 0x00;
                CHARGE_STATUS = 0x00;            
                FAST_charge();
                SETBIT(CHARGE_STATUS,TRICKLE);
                CLRBIT(CHARGE_STATUS,ERROR);
                putstr("out");                              
            }                        
            

when i activated the SEI(); my program won't start at all ? when i pressed
the start button (PORTC4) the program is looping up again so it give me
SMART BATTERY CHARGER NiMh massage again and again as long i pressed
the start button ?

but when i disabled the SEI(); my program work just fine, it works normal
!
only the time is not shown/work ? is my mistake at init ? I'm using
AVRGCC 3.2, or anyone can give me small function counting time using timer
overflow only, without using any interupt ?

Can anyone help me ?           

Thanks....