Re: Accessing GPIO pins

On Mon, 28 Nov 2005 07:19:21 -0800 (PST), Tom Convent  
<conventag@xxxxxxxxx> wrote:

>  Hello Rob,
>                     I tried matching virtual memery to physical memory,  
> but virtualcopy function returns 0.
>  
> -------------------------------------------------------------------------------------------------------------------------
>  #define BASE 0x40E00000
>   #define PAGESIZE 4096
>  DWORD *pMemBase;
>   BOOL bSucess;
>  pMemBase = (DWORD*) VirtualAlloc(0, PAGESIZE, MEM_COMMIT,  
> PAGE_READWRITE);
>     if(pMemBase != NULL)
>  {
>  bSucess = VirtualCopy(pMemBase, (void*)(BASE >> 8) , PAGESIZE,    
> PAGE_READWRITE | PAGE_NOCACHE | PAGE_PHYSICAL);
>   }
>  if(bSucess)
>  {
>    printf("Virtualcopy returned %d", bSucess);
>   return TRUE;
>  }
>  else
>  {
>   printf("Virtualcopy returned %d", bSucess);
>   return FALSE;
>  }
>  
> ---------------------------------------------------------------------------------------------------------------------------
>  I am using evc++ 4.0. After searching on google I got what might be the  
> error  it says "VirtualCopy() is not an exported function in  
> eVC++ although it is defined in coredll.lib. Platofrm Builder 3.0 has  
> this function exported. To enable the use of virtualcopy function it  
> should be defined in .h file as fallows
>  extern "C" BOOL VirtualCopy(LPVOID dest, LPVOID src, DWORD size, DWORD  
> flags);
>  I exactly defined like above in .h file. I only have evc++ as an option  
> to develop device drivers.
>  Any help and hints would be greatly helpful for me. I am not able to  
> figure out why virtualcopy function returns zero ??
>  thanks
>  Tom
>

Tom,

I'm not near a Windows computer or any of my WinCE references.  There  
isn't much more that I can do to help you.  Take a look at the bib files  
for your target.  I'd recommend using Platform Builder for driver  
development and debugging.  Try checking to see if there is an update to  
eVC++.

Another possible choice is to take a known good working driver and modify  
it to do nothing more than point at a different base address or toggle a  
pin that you can monitor.  It shouldn't be this difficult, but that is the  
nature of WinCE and Windows in general.  If you don't have PB, try  
downloading the 120-day evaluation version and using it.  Maybe then you  
can get things working properly for you.


Take Care.

Rob!


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