Re: What is the purpose of a GPIO controller
From: Ian Campbell (ijc_at_hellion.org.uk)
Date: 02/15/05
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To: krishna <krishna.c@globaledgesoft.com> Date: Tue, 15 Feb 2005 14:08:33 +0000
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 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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