Attiny13a(Clean Embeded C) constantly triggers interupt/looping what's in ISR macro for no reason

Using Arduino Programming Questions
1

I'm not sure if this forum is good place to ask questions about Embeded C but i saw somone doing this without problem so i guess it's fine(and i'm kinda to desperate to care).

WHenever i add ISR macro no matter what vector i use, or whatever interrupts are disabled or enabled Attiny13a is executing whatever is in {} brackets of that macro in a loop.(in this case it blinks LED connected trough transistor on PIN4 instead of turning this LED on until PINB3 is connected to ground)
i even tried SIGNAL macro and it's same.
I'm using avr-gcc with avr dude (Arduino UNO clone "Elego UNO R3" as ISP) on linux mint.

#include <avr/io.h>
#include <avr/interrupt.h>
#include <util/delay.h>
// EMPTY_INTERRUPT(ADC_vect);
ISR(ADC_vect )
{
    _delay_ms(100);
    PORTB |= _BV(PORTB4);
    _delay_ms(100);
    PORTB &= ~_BV(PORTB4);
    reti 	( 		) 	;
}

int main(void)
{   
    cli (); 	

        while (1)
        {
            if (PINB & _BV(PINB3))
            {
                PORTB |= _BV(PORTB4);
            }
            else 
            {
                
                PORTB &= ~_BV(PORTB4);
            }
        }
}

Strangely enough behavior is same after i comment out #include <avr/interrupt.h> compiler only throws some warnings.

2

You should have no problem doing that with the Arduino IDE or Atmel Studio. Why bother with Embedded?

If you use Arduino, choose the proper core for the ATTiny.

4

What is wrong with this picture?

6

The only thing i can see is delay right after interrupt but this isn't causing the problem. Eventually space in

(ADC_vect    )

with look ugly (but obviously isn't culprit either)

7

Yup. That's the one.
200ms of thumb-twiddling in interrupt context.

8

I want to learn about embeded systems on lower level.(first part of me want to do it with hope that this knowledge will help me get a job as embedded system developer, second want to do it just for "fun" ....and.... third keep telling the first one to stop laying to myself)

9

whatever " thumb-twiddling" means (no native english speaker) delay is not issue, i put

    PORTB |= _BV(PORTB4);
    PORTB &= ~_BV(PORTB4);

in vector i see LED deeming and when i looked at my oscilloscope it switches really fast in loop.
PS. At least it seems like that but i guess my old made in USSR oscilloscope dosn't catchup.

10

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