[SOLVED] Atmega32, int0, c, avrgcc

[alexan_e]

I don't see any ininterrupt variable in the attached code of post #1 , do you mean the article in the link?

- - - Updated - - -

oh, ok , you meant post #4

- - - Updated - - -

When a variable is shared in interrupts and the main code then it should always be declared as volatile so that the compiled is forced to read the variable value from the source rather than a cached copy from a register then may be no longer valid.

 

[bitsurfer]

OK, now I see that.
Since I am unexperienced in AVR programming it takes me several days to get this simple example working and nobody say this before.

Now problem is fixed and I can go forward.
Thanks for help again.

nime.

 

[alexan_e]

Unfortunately I only checked the code of the first post ans these was no such issue with a shared variable.

There are some good guides for AVR https://www.fourwalledcubicle.com/AVRArticles.php including one for interrupts

The tutorial section in the AVRfreaks forum is also a good source of knowledge https://www.avrfreaks.net/index.php?name=PNphpBB2&file=viewforum&f=11