• State Not Answered
  • Locked Locked
  • Replies 12 replies
  • Subscribers 21 subscribers
  • Views 3881 views
  • Users 0 members are here
2025 survey

We are running a survey to help us improve the experience for all of our members. If you see the survey appear, please take the time to tell us about your experience if you can.

Options
Related
How was your experience today?
This discussion has been locked.
You can no longer post new replies to this discussion. If you have a question you can start a new discussion

#pragma ASM/ENDASM inside a #define (???)

Carlos Santos

Hello,

I'm having trouble using #pragma ASM/ENDASM inside a #define statement. This is what I want to do inside the #define:

- push ACC (assembly)
- push IE (assembly)
- EA = 0 (C)

This is the code I'm *trying* to use:

#define portENTER_CRITICAL() \ 
{ \ 
#pragma ASM \ 
push  ACC \ 
push  IE  \ 
#pragma ENDASM \ 
EA = 0; \ 
}

But I always get an error, no matter what I change... also, it seems that #pragma ASM/ENDASM can't be used inside header files (who knows why...), is there any workaround for that, without repeating the same #defines inside all .c files that uses it?

Best regards,
Carlos.

PS: any one answering this thread, nevermind the "that's a bad practice! use separate asm and c source files! blah blah!..." comments... I really need this, so don't bother with those kind of comments...

Parents Reply Children
  • 0 in reply to Andy Neil

    Hello :)

    Yep, I took Cygnal port as a base... The problem is the compiler... I'm using Keil and they use SDCC. SDCC suports assembly in #define statements, but doesn't support 51MX family, I think only keil cx51 supports 51MX...

    I already "expanded" all #defines with the code that was supposed to be inside them (basically I've made the pre-processor work by hand :), but now I have linker errors saying that it can't find some libraries (I think it has to do with floating point operations)...

    Regards and thanks for the replies :)
    Carlos.

  • 0 in reply to Carlos Santos

    "(I think it has to do with floating point operations)"

    Why would an RTOS be doing floating-point operations...?!

  • 0 in reply to Andy Neil

    Hi,

    It's only on the demo software, to test the RTOS. The logic behind that is the greater probability of a task being interrupted by a context switch between a float operation (sum, multiplication, etc...) than with a single byte operation...

    regards,
    Carlos.

  • 0 in reply to Carlos Santos

    ANSI C does not allow preprocessor directives to be generated by #define.

    There's one ugly way to do this just with the C preprocessor:

    header.h
    --
    ...
    #include "mypragma.pragma"
    ...

    mypragma.pragma
    --
    #pragma mypragma
    --

    But I can't really recommend it.