823 ports access question

823 ports access question

[Christopher Huffine]

Sorry to write another simplistic question; hopefully
there is a simplistic answer as well:

I'm trying to figure out to write to specific
PPC ports.  For example, the Bright Star
ipEngine I have has LEDs connected to the LCD ports
from the PowerPC.  I'm looking for the right
sequence to actually write to these ports and
get these LEDs to turn on and off.

I've looked in 8xx_immap.h and I start to see
what I need to make this work (im_lcd), but I'm missing
the bigger picture.  Anyone have any example
code for anything like this?

Thanks,

Chris


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RE: 823 ports access question

[Brown, David (dbrown03)]

Port D:
  immr->pio.pdpar = 0;
  immr->pio.pddir = 0x1F0;
  if (turnOn)
    immr->pio.pddat |= (1<<(8-led));
  else
    immr->pio.pddat &= ~(1<<(8-led));
--
Dave Brown <dbrown03@harris.com>

> -----Original Message-----
> From: Christopher Huffine [mailto:huffine@wopr.nrl.navy.mil]
> Sent: Monday, August 28, 2000 7:19 AM
> To: linuxppc-embedded@lists.linuxppc.org
> Subject: 823 ports access question
>
>
>
> Sorry to write another simplistic question; hopefully
> there is a simplistic answer as well:
>
> I'm trying to figure out to write to specific
> PPC ports.  For example, the Bright Star
> ipEngine I have has LEDs connected to the LCD ports
> from the PowerPC.  I'm looking for the right
> sequence to actually write to these ports and
> get these LEDs to turn on and off.
>
> I've looked in 8xx_immap.h and I start to see
> what I need to make this work (im_lcd), but I'm missing
> the bigger picture.  Anyone have any example
> code for anything like this?
>
> Thanks,
>
> Chris
>
>
>

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Re: 823 ports access question

[Wolfgang Denk]

In message <Pine.LNX.3.96.1000828071718.5707A-100000@wopr.nrl.navy.mil> you wrote:
>
> Sorry to write another simplistic question; hopefully
> there is a simplistic answer as well:

There is :-)

> PPC ports.  For example, the Bright Star
> ipEngine I have has LEDs connected to the LCD ports
> from the PowerPC.  I'm looking for the right
> sequence to actually write to these ports and
> get these LEDs to turn on and off.
>
> I've looked in 8xx_immap.h and I start to see
> what I need to make this work (im_lcd), but I'm missing
> the bigger picture.  Anyone have any example
> code for anything like this?

See the tqm_led demo driver code under
http://www.denx.de/solutions-en.html#drivers

Wolfgang Denk

--
Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-4596-87  Fax: (+49)-8142-4596-88  Email: wd@denx.de
"Do we define evil as the absence of goodness? It seems only  logical
that shit happens--we discover this by the process of elimination."
                                                        -- Larry Wall

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