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How to call a C function from assembly

namratha chowdary

I am writing an ISR using assembly language .
I want to know how to call a C function from assembly.I am using keil compiler and 8051 microcontroller .Reply as soon as possible.

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  • 0 in reply to namratha chowdary

    After the above modifications its not giving any syntax error but logical errors i am facing means my code is not working.

    Simply calling the C function is not enough - your assembly code must also follow the calling conventions for C functions, which are described in the link I posted earlier. It deals with things like:

    * How are the function arguments passed to the function ?
    * How is the return value passed back to the caller ?
    * Which registers have to be saved by the caller, and which are saved by the function ?

    and so on.

Reply
  • 0 in reply to namratha chowdary

    After the above modifications its not giving any syntax error but logical errors i am facing means my code is not working.

    Simply calling the C function is not enough - your assembly code must also follow the calling conventions for C functions, which are described in the link I posted earlier. It deals with things like:

    * How are the function arguments passed to the function ?
    * How is the return value passed back to the caller ?
    * Which registers have to be saved by the caller, and which are saved by the function ?

    and so on.

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