Gre7g Luterman wrote: > *> From:* Charalampos Alexopoulos <[EMAIL PROTECTED]> > *> To:* avr-gcc-list@nongnu.org > *> Sent:* Wednesday, October 29, 2008 12:12:00 PM > *> Subject:* Re: [avr-gcc-list] How to handle interrupt vectors ? > > > > I was asking for information about interrupt vector's not for ISR. Yes i > > have seen the code for the ISR and i have no understanding of the > > mechanism because i don't know what that vector is. It is very obvious > > that foo::mumble is not working, thats why i am asking for help. > It sounds to me like the problem we're having here is communication, > not so much a programming issue. I'm gonna' take a wild shot at this, > so if I'm way off base, please don't scold me! > > If your background is not programming AVR's, then you may be > accustomed to keeping your interrupt vector list in RAM. In such a > case, you would need your code to set a given vector so that > interrupts are handled by the correct routine. > > In AVRs, this vector table is kept in Flash. You don't actually call a > function with a vector number to set anything. The compiler (OK, the > linker actually) looks at your code and if it recognizes a > familiarly-named function, then it puts that vector in the table. This > is done at compile time, not at run time. You never actually call > anything with a parameter indicating which vector. > > So you may be talking interrupt vectors, but we're talking ISRs. You > need to identify what happens when that vector is called, create a > function to hold that code, and correctly name the function so that > the compiler will handle it correctly. There is no way (short of doing > a Flash write) to change an interrupt vector in your code. > > ... Let the flames begin. :) > > Gre7g > > ------------------------------------------------------------------------ > > _______________________________________________ > AVR-GCC-list mailing list > AVR-GCC-list@nongnu.org > http://lists.nongnu.org/mailman/listinfo/avr-gcc-list > before i identify what happens when that vector is called i have to decide what i want to happen and before i decide that i need to know what that vector is. I don't want to change anything at run time. All the work will be done at compile time. What i want is the information be part of a class in a constant way. I know that it can't be a normal constant because ISR is handled by preprocessor and a constant member of a class get its value at compile time. Anyway all this is just to talk something about because what i want to know is some information about interrupt vectors. Until few days before i didn't know that vectors exist in c , since then i have learn some thinks and i want to learn more, so i decide to ask in a site that maybe somebody have a specific knowledge in the vectors of my interest.
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