From: Ian Campbell <ijc@hellion.org.uk>
To: krishna <krishna.c@globaledgesoft.com>
Cc: Linux Kernel <linux-kernel@vger.kernel.org>
Subject: Re: What is the purpose of a GPIO controller
Date: Tue, 15 Feb 2005 14:08:33 +0000 [thread overview]
Message-ID: <1108476513.3324.10.camel@icampbell-debian> (raw)
In-Reply-To: <4211FDFC.3040905@globaledgesoft.com>
On Tue, 2005-02-15 at 19:19 +0530, krishna wrote:
> Can any one tell me what is the purpose of GPIO controllers.
I'm not sure what question you are asking... GPIO controllers are
clearly for the purpose of controlling GPIO pins. GPIO stands for
general purpose i/o, so they are used for all sorts of things.
For example, hardware designers hook up all sorts of things to GPIO
lines: input switches, reset lines to other chips on the board, leds,
relays. I have boards where an i2c bus has been constructed using 2 gpio
lines, another gpio is used to control the LCD backlight, etc, etc.
Ian.
--
Ian Campbell
Current Noise: Opeth - To Rid the Disease
The pollution's at that awkward stage. Too thick to navigate and too
thin to cultivate.
-- Doug Sneyd
prev parent reply other threads:[~2005-02-15 14:08 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-02-15 13:49 krishna
2005-02-15 14:08 ` Ian Campbell [this message]
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