Re: [avr-gcc-list] Help with interupt

[Lorne Gutz]

Michael,

      From what I see you could have a number of problems.

   Frist you could have the hardware external interrupts
enabled, hence you program will not work when sei()
is on.

    Second you have no variable declarations shown,
which could mean you have not declared the 
volatile variables properly.  Hence your display 
program ( not shown ) will not work.

Lorne




On Friday 25 April 2003 06:05, Michael Hadianto wrote:
> 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....
>
>
>
> _______________________________________________
> avr-gcc-list mailing list
> address@hidden
> http://www.avr1.org/mailman/listinfo/avr-gcc-list