RE: Accessing GPIO pins

Hi Tom,

 

An other hint, as you are giving a physical address to VirtualCopy, do not
forget to use the PAGE_PHYSICAL flag and you also have to divide the
physical address by 256. ( like stated in WinCE help).

So your code would work if you had those changes and also you would have to
change 

#define GPIO 0x40E00068

To

#define GPIO 0x40E00000

because of the division, so make sure you are binding enough memory.

 

Finally yes you can have access to your GPIOs by assigning a value to the
obtained pointer.

 

Regards,

 

Nicolas Frayer.

 

  _____  

From: windowsce-dev@xxxxxxxxxxxxxxx [mailto:windowsce-dev@xxxxxxxxxxxxxxx]
On Behalf Of Tom Convent
Sent: Friday, November 18, 2005 6:25 AM
To: windowsce-dev@xxxxxxxxxxxxxxx
Subject: Re: [windowsce-dev] Accessing GPIO pins

 

  Hello Rob, 
   
  With you hints I got VirtualAlloc and VirtualCopy funtions help. I have
written a sample code and Included here.
   
  #define GPIO 0x40E00068 // physical addess of device
  #define size 4800*4 //page size 
  int set; 
  set = VirtualCopy(lps, GPIO, size, PAGE_READWRITE); // lps is handle
written by VirtualAlloc function
   
  
  if I understand the functions correctly, I should write values to a
virable "set" to toggle GPIO pins, like
   
  set = 0x64000000; // toggles GPIO pins  ??
   
  please carify,
  thanks 
  Tom Convent.


Rob Wehrli <rwehrli@xxxxxxxxxxx> wrote:  On Thu, 17 Nov 2005 17:05:23 -0000,
conventag <conventag@xxxxxxxxx> wrote:

> hello friends,
>
> Iam new to CE 5.0 and Iam using intelPXA270 processor. I want to write
> bytes to processor GPIO control register. it is possible to write
> directly, for example I defined
> #define GAFR2 (*((volatile unsigned long *) 0x40E00068))
> GAFR2 = 0x64000000;
>
> unfortunately I cannot see my GPIO pins acts accordingly. It is
> possible to write directly or there are some functions in Windows CE
> 5.0 to control processor registers. I appreciate if someone just pass
> hints on how to access processor register under CE 5.0
>
> thanks
>
>

Do a search of VirtualAlloc and VirtualCopy in your MSDN for WinCE.   
Basically, you need to obtain a handle to physical memory mapped to the  
virtual address space before you can use it.  Once you have a handle,  
you'll have fun toggling your GPIO pins by the dozens...


Take Care.

Rob!



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