From: "akash kaul" <akashkaul@deccanetworld.com>
To: <srinivas.surabhi@wipro.com>, <linuxppc-embedded@ozlabs.org>
Subject: RE: LED driver
Date: Thu, 17 Mar 2005 11:45:25 +0530 [thread overview]
Message-ID: <005d01c52ab8$b5bba5d0$1b69cb0a@BGCW0166> (raw)
In-Reply-To: <EF9B29C78F41FA488927FCBC7750AF0E011DA945@hyd-mdp-msg.wipro.com>
Hi Surabhi,
You basically have to write appropriate values into Port data register
corresponding to the GPIO pin to switch the led on or of. The register
can be accessed thru the immap pointer.(i.e internal memory map pointer
)look at the file include/asm-ppc/immap_cpm2.h relative to ur kernel
source base. You will find the mapped register variable in this file.
If you need to access this immap memory from userspace then u have to
make a system call to enter kernel space and access the immap memory.
Regards,
Akash Kaul
Hi,
I am working on the MPC8270 board having connected GPIO 3 lines
connected to 3 LEDs. So can any one help me in finding out the best
solution of controlling the LEDs from MVlinux (kernel and user space) or
any pointers who has done it before.
Thanks & Rgds
SS
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next prev parent reply other threads:[~2005-03-17 6:24 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-03-17 5:15 FW: LED driver srinivas.surabhi
2005-03-17 6:15 ` akash kaul [this message]
2005-03-17 9:46 ` Hans Schillstrom
2005-03-17 11:35 ` Wolfgang Denk
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