i would still recommend going to the github and have the dev himself take a look at it. as i've never dabbled with interrupts with C (except for arduino stuff).

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x86?  We ain't got no x86.  We don't NEED no stinking x86!

Thank you guys for your responses. Yes, after posting, I sent an email to the developer, pointing him to my post. Hopefully, he'll respond back here so everyone benefits. If not, and emails me directly, I'll repost any answers from the developer. BigDumbDinosaur( ), thank you, yes, I agree with you, but I would just like to see it work.

Thanks!

The load to 0x1000 looks right, that is the best way of doing it, using a custom named section and placing it at the address in the linker rules file.

You can define an interrupt function using the interrupt attribute:



The compiler will take care of saving registers and generating the RTI instruction at the end.

Inline assembler is not currently supported. I have no immediate plans to implement it. Currently you need to separate C and assembly in different source files. If there is any specific reason/use-case you have for it, let me know. You can call functions written in assembler and the compiler should be able to handle at least some stuff you might want it for, using interrupt functions as shown above and by intrinsic functions (see the user guide and the provided header file intrinsics6502.h).

Regarding interrupts in C. If you do it, avoid making function calls as that will generate a lot of save overhead. Well, you can make calls to small functions provided that they are inlined. Refer to the user guide about inlining and how to control it (to some degree).

Thank you much for your help I didn't realize that one can just put __attribute__((interrupt)), I thought an address was required.
As for inline asm, I can only think the use would be to save on overhead JSR/RTS calls, especially if it's just a few instructions.

Regarding calling asm from C(manual Sections 18.2/18.3), I'm not sure I totally get it since I have thick skull. Example: Say I want to pass the address to an asm function, would I do:
.c

.s

Thanks!

* UPDATE * - the above is correct. If passing down a byte it will use the accumulator, after that or if passing a 16 bit var, it'll use the _Zp pseudo registers, as per the 6502 guide. This info can be found at 18.3 Calling convention (P.94) (for v.3.6.10)
I haven't written anything huge, only test programs, but find this compiler works very well. Simple VIA(6522) port toggling, and counter IRQs. Sounds via a PSG(AY-3-8910), serial and memory tests all work without a hitch.
Thanks guys for your help!

Meanwhile reachable only at https://web.archive.org/web/20211126214 ... _instr.pdf