linux-kernel - RE: [PATCH] Add the LED burst trigger

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Message-ID: <BLU172-W30E6E7C0BC2B6C08FA0552ACCD0@phx.gbl>
Date:	Thu, 26 Dec 2013 19:31:40 -0500
From:	Joe Xue <lgxue@...mail.com>
To:	Pavel Machek <pavel@....cz>
CC:	"cooloney@...il.com" <cooloney@...il.com>,
	"rpurdie@...ys.net" <rpurdie@...ys.net>,
	"rob@...dley.net" <rob@...dley.net>,
	"milo.kim@...com" <milo.kim@...com>,
	"linux-leds@...r.kernel.org" <linux-leds@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>
Subject: RE: [PATCH] Add the LED burst trigger

Hi,

I'm writing the Morse code trigger.
what about this

echo "-.-. *"> patten
-              a long on then a off
.              a short on then a off
space     a long off
*             mean repeat the patten
s             mean indicate the patten just one time then stop

Do we also need a  "step_length_ms" as Pavel's suggestion?
If so, we can define long on as 2*step_length_ms and short on as 1*step_length_ms.

Any other parameters do you guys think we should add?

Any suggestion is very appreciated.

Thanks

Joe



----------------------------------------
> Date: Thu, 26 Dec 2013 15:26:08 +0100
> From: pavel@....cz
> To: lgxue@...mail.com
> CC: cooloney@...il.com; rpurdie@...ys.net; rob@...dley.net; milo.kim@...com; linux-leds@...r.kernel.org; linux-kernel@...r.kernel.org; linux-doc@...r.kernel.org
> Subject: Re: [PATCH] Add the LED burst trigger
>
> Hi!
>
>> Yes, Morse code can indicate any means. But when we look at the LEDs, would we like to also have a Morse code book in hand?
>>
>> The burst led blink idea is because it is easy to use and easy to describe. Mostly when users on site are describing the LEDs states to the support engineer.
>>
>
> Well.. above 7 or so blinks, people will be unable to count. "one
> short, one long" will help to extend that.
>
> Plus, there may be patterns such as "keep it ON, count number of brief
> OFFs"...
>
> That's why I suggested:
>
>>> echo 40> step_length_ms
>>> echo "- - - "> pattern
>>>
>>> do the same trick?
>>>
>>> Plus, you could for example do
>>>
>>> echo "- --- "> pattern
>>>
>>> to do morse code...
>
> Interface
>
> (Note that your client stripped some spaces out of it).
>
> With that, it should be very easy to program all the reasonable
> blinking patterns for single LED without PWM.
> Pavel
> --
> (english) http://www.livejournal.com/~pavelmachek
> (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html 		 	   		  --
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