MPC5200 LEDs

MPC5200 LEDs

[Steve Kaiser]

Before I plow into it, I ask for your advice.  What is the best way to turn
on/off the status LEDs on the Motorola Lite5200 ("IceCube") board?

Although experienced with embedded micros & DSPs in general, I am a newbie to
Linux and the MPC5200.
Thanks to Wolfgang for the most excellent U-Boot and ELDK.  With these tools,
I have compiled a 2.4.25 kernel and have it running from either RAM or Flash
in my 5200 IceCube.  I can insmod a simple "hello world" module on my target.
That's where I'm at.  I figure the next exciting step is to turn LEDs on &
off.  Right?  What's the best/correct way in the Linux tradition?  Any tips
are welcome.

Steve Kaiser
Chemistry Electronics Shop
Univ of Calif - Riverside


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Re: MPC5200 LEDs

[Richard Danter]

Hi Steve,

On Tue, 2004-05-18 at 16:50, Steve Kaiser wrote:
> Before I plow into it, I ask for your advice.  What is the best way to turn
> on/off the status LEDs on the Motorola Lite5200 ("IceCube") board?

I don't know anything about the 5200 board, but I recently wanted to do
the same thing with the LED's on the Wind River (EST) SBC8260 board.

The LED's on this board are write-only at a specific address. My
solution was to write a simple loadable module (like a device driver,
but not statically linked to the kernel). Once loaded, any application
can write to the LED's by writing to the module in /dev.

I can send you my code as an example if you want it.

Rich


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Re: MPC5200 LEDs

[Wolfgang Grandegger]

On 05/18/2004 05:50 PM Steve Kaiser wrote:
> Before I plow into it, I ask for your advice.  What is the best way to turn
> on/off the status LEDs on the Motorola Lite5200 ("IceCube") board?
>
> Although experienced with embedded micros & DSPs in general, I am a newbie to
> Linux and the MPC5200.
> Thanks to Wolfgang for the most excellent U-Boot and ELDK.  With these tools,
> I have compiled a 2.4.25 kernel and have it running from either RAM or Flash
> in my 5200 IceCube.  I can insmod a simple "hello world" module on my target.
> That's where I'm at.  I figure the next exciting step is to turn LEDs on &
> off.  Right?  What's the best/correct way in the Linux tradition?  Any tips
> are welcome.

I have recently started to port/develop a little digital I/O driver for
the Icecube for a Linux driver training course. It allows to configure
some port pins for output and input with interrupts and with a few
jumper cables you can toggle the pins and trigger interrupts. It's still
in a preliminary state. Nevertheless I could send it to you in a private
mail in case you are interested.

Wolfgang.

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Re: MPC5200 LEDs

[J.D. Bakker]

At 8:50 -0700 18-05-2004, Steve Kaiser wrote:
>Before I plow into it, I ask for your advice.  What is the best way to turn
>on/off the status LEDs on the Motorola Lite5200 ("IceCube") board?
>
>Although experienced with embedded micros & DSPs in general, I am a newbie to
>Linux and the MPC5200.
>Thanks to Wolfgang for the most excellent U-Boot and ELDK.  With these tools,
>I have compiled a 2.4.25 kernel and have it running from either RAM or Flash
>in my 5200 IceCube.  I can insmod a simple "hello world" module on my target.
>That's where I'm at.  I figure the next exciting step is to turn LEDs on &
>off.  Right?  What's the best/correct way in the Linux tradition?  Any tips
>are welcome.

Do you have working userspace (ie, do you have a ramdisk or the like
loaded, and do you get a prompt where you can execute commands) ? If
so, you can set and read memory locations using a cross-compiled
version of devmem2:

http://www.lart.tudelft.nl/lartware/port/devmem2.c

Just find out the (physical) address of the latch driving the LEDs,
and you can toggle them from the command line.

Regards,

JDB.
--
LART. 250 MIPS under one Watt. Free hardware design files.
http://www.lart.tudelft.nl/

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