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From C, inline assembly LJMP to Numerical Address

Ted Dubroff

How do I perform a long jump to a numerical address from my C code?
I'm pretty sure I have to do this with inline assembly - however that
seems complicated for C51. I figured in C I could do this:

typedef void (*jmpPtr)(void);
jmpPtr jmp;

...

unsigned int address = 0x4000U;
jmp = (jmpPtr) address;
(*jmp)();

Except for the call differences, I think this would be the same as doing
a jump to the numerical address? Keil, is this correct?

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  • 0 in reply to Ted Dubroff

    It certainly has - page 12!

    What gave you the impression it couldn't be done? It's no more difficult than many compilers which support inline Assembler.

    The catch is that you also need to specify the SRC directive to make the Compiler emit assembler source, and then pass that to the assembler to generate the object!
    (in uVision2, just check the 'Generate Assembler SRC File' and 'Assemble SRC File' options in the file properties for the 'C' source)

Reply
  • 0 in reply to Ted Dubroff

    It certainly has - page 12!

    What gave you the impression it couldn't be done? It's no more difficult than many compilers which support inline Assembler.

    The catch is that you also need to specify the SRC directive to make the Compiler emit assembler source, and then pass that to the assembler to generate the object!
    (in uVision2, just check the 'Generate Assembler SRC File' and 'Assemble SRC File' options in the file properties for the 'C' source)

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