Assembly inline in c

Asked Dec 15 '16 at 17:31

Active Dec 15 '16 at 17:31

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I have read tons of similar questions about this stuff here but still can't solve my problem. I need to use this piece of assembly code in C file:

unsigned char * led = (char *) 0xC0;
for (int i = 0; i < 10; i++)
{
  __asm
    {
      ror [led[i]],1
    };    
}

I just need to rotate all values in led variable by 1 bit. While using this code I get an Factor expected error. When i remove [] brackets around led value, it is end of line expected error. Strange thing is the code bellow works perfectly:

  __asm
    {
      nop
    };

As you can see these samples look very similar but there is only one working properly. What am I doing wrong? If it is relevant i try to make an easy application in CodeWarrior, which is IDE for embedded software development.

asked Dec 15 '16 at 17:31

user7303261

Are you programming under an x86 environment? – MD XF Dec 15 '16 at 18:03
2

You could avoid the assembly and do the ror in C: http://stackoverflow.com/a/776523/6321114 – Loring Dec 15 '16 at 18:04
Here it is: http://stackoverflow.com/questions/21369405/modifying-array-elements-with-inline-assembly – SergeyLebedev Dec 15 '16 at 18:36

Assembly inline in c

0 Answers0