[U-Boot] i.MX51 How to use and program LED's

[U-Boot] i.MX51 How to use and program LED's

[Carlo McKee]

Hello,

I need help on how to write a simple routine in C to turn on and off the
general purpose diagnostic LED's of the iMX51 EVK board.
I am developing under Linux. Any help appreciated.

[U-Boot] i.MX51 How to use and program LED's

[Stefano Babic]

Carlo McKee wrote:
> Hello,
> 
> I need help on how to write a simple routine in C to turn on and off the
> general purpose diagnostic LED's of the iMX51 EVK board.
> I am developing under Linux. Any help appreciated.

As I cann see from schematics, the diagnostic led is connected with
GPIO2_6. At the moment, there are no accessors function to access the
gpio, in the same way we have for i.MX31. It should be nice to have it,
however ;)

Anyway, you can directly access to the gpio controller with readl/writel
accessors. You can see an example (read) in mx51evk.c in board_mmc_getcd().

Check the gpio controller part of the manual, you need at least to set
the direction as output for the GPIO2_6 pin before setting it.

Regards,
Stefano Babic

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[U-Boot] i.MX51 How to use and program LED's

[Wolfgang Denk]

Dear Carlo McKee,

In message <aa75524c1003250838l4cfb3d72wd4967a0935a0b235@mail.gmail.com> you wrote:
>
> I am developing under Linux. Any help appreciated.

You might get more help when posting on a Linux mailing list - here
you are completely off topic.

Before reposting ona Linux mailing list: chek if you have cinfigured
the GPIO driver in your kernel, and explain in detail how you tried to
access it, and what exactly is not working.

Best regards,

Wolfgang Denk

-- 
DENX Software Engineering GmbH,     MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
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