playing with physical ports ?

This is a discussion on playing with physical ports ? within the C Programming forums, part of the General Programming Boards category; In assembly there are IN and OUT commands, does C/C++ have something like it, without mixing assembly in the code ...

  1. #1
    * Death to Visual Basic * Devil Panther's Avatar
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    Question playing with physical ports ?

    In assembly there are IN and OUT commands, does C/C++ have something like it, without mixing assembly in the code (asm {}).

    Thanks.
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  2. #2
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    As far as I know, standard C has no functions for port access. Depending on the compiler you are using you may have functions available for accessing ports, or, depending on the OS, you could use the system calls of the OS.

    Another way could be to use the address of the port directly and write to it.

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    You can playing with physical ports in 'c' using
    "inp()" and "outp()" and other this series of functions.
    Chintan R Naik

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    * Death to Visual Basic * Devil Panther's Avatar
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    Thanks

    Thanks
    "I don't suffer from insanity but enjoy every minute of it" - Edgar Allen Poe

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    does that work under linux?

    what header?

    do you need to be root?

    system call?

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    The functions inp() and outp() are not standard C functions, so your compiler might not support it.

    Info on IO port programming for Linux:
    http://www.tldp.org/HOWTO/mini/IO-Port-Programming.html

    If you use GCC, then you can use inp() and outp(), you need to include pc.h for that.
    Last edited by Shiro; 06-29-2003 at 04:13 AM.

  7. #7
    Banned master5001's Avatar
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    BTW, you are also able to mix asm code (inlined or separate) with your C code. Sometimes its just easier to write what you know how to do in assembler and link it to your C.

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    * Death to Visual Basic * Devil Panther's Avatar
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    That's a different problem i'm having, I know assembly, but I don't know how to link it.

    i write the next in my c code:

    Code:
    asm 
     {
       // some assembly ops comes here
     }
    but it does not compile...
    I know I need to link something so it will work, but what?
    "I don't suffer from insanity but enjoy every minute of it" - Edgar Allen Poe

    http://www.Bloodware.net - Developing free software for the community.

  9. #9
    Super Moderator VirtualAce's Avatar
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    What editor are you using?? The older IDEs normally need TASM to assemble any assembly language. Newer compilers like MSVC and BC normally have a built in inline assembler.

    Like, for instance, the old DOS Turbo C++ IDEs require a path to TASM and you must use the correct TASM command line switches to assemble any assembly - inline or complete modules.

  10. #10
    * Death to Visual Basic * Devil Panther's Avatar
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    I'm using Borland 5.5 compiler, on windows.
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  11. #11
    ATH0 quzah's Avatar
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    Originally posted by Devil Panther
    That's a different problem i'm having, I know assembly, but I don't know how to link it.

    i write the next in my c code:

    Code:
    asm 
     {
       // some assembly ops comes here
     }
    but it does not compile...
    I know I need to link something so it will work, but what?
    That's because you're on the C board. 'asm' is a C++ keyword. The same goes for 'inline', unless they have added both in C99.

    Quzah.
    Hope is the first step on the road to disappointment.

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