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Not able to use inline assembly in Keil

I am not able to use inline assembly in my C source file. I tried to Enable Generate Assembler SRC file and Enable Assemble SRC file. Then i used #pragma ASM in the beginning of the assembly code and #pragma ENDASM at the end of the assembly code, but it is not able to recognize even the LDR command. The commands are not recognisable even when i am using __asm() block to write the code. Please advise.

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0 A Piscarius over 9 years ago

No need to muck about with command line directives.

This sort of thing works for me:

static unsigned long SwapU32(unsigned long to_swap)
{
  const unsigned long mask = 0x00FF00FF;
  unsigned long temp;

  __asm {
    AND temp,    mask,    to_swap
    AND to_swap, mask,    to_swap, ROR #24
    ORR to_swap, to_swap, temp,    ROR #8
  }

  return (to_swap);
}

Function extracted from original Keil supplied source.

Reply

0 A Piscarius over 9 years ago

No need to muck about with command line directives.

This sort of thing works for me:

static unsigned long SwapU32(unsigned long to_swap)
{
  const unsigned long mask = 0x00FF00FF;
  unsigned long temp;

  __asm {
    AND temp,    mask,    to_swap
    AND to_swap, mask,    to_swap, ROR #24
    ORR to_swap, to_swap, temp,    ROR #8
  }

  return (to_swap);
}

Function extracted from original Keil supplied source.

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