Re: [Gumstix-users] Change to kernal? (Was) External Power for USB

[Tom C. <TCalef@HatchScience.com>]

If you try to power up a USB device off of the OTG port (I am assuming this is the port your using.. I may be wrong), if the power descriptor says that its max power > 100mA then the kernel will yell at you saying that its above the recommended amount. I've been trying to figure out where to shut this check off, but with no avail.

-Tom


-----Original Message-----
From: William Pretty Security Inc [mailto:bil...@xp...]
Sent: Thu 1/27/2011 6:36 PM
To: 'General mailing list for gumstix users.'
Subject: [Gumstix-users] Change to kernal?  (Was) External Power for USB
 
Hi Tom;

 

I'm sorry. I don't know what you mean ?

 

When you plug in the dongle , the adapter powers it up. 

What's to change in the Kernel ?

What checks ?

 

The dongle would have to be plugged in when you powered up the Overo. It
wouldn't be hot swapable ..

 

Bill

 

The best executive is one who has sense enough to pick good people to do
what he wants done, 

and self-restraint enough to keep from meddling with them while they do it.

Theodore Roosevelt

 

From: Tom Calef [mailto:TCalef@HatchScience.com] 
Sent: Thursday, January 27, 2011 3:12 PM
To: General mailing list for gumstix users.
Subject: Re: [Gumstix-users] External Power for USB

 

That should work fine, but do you know what to set in the kernel to make it
get past the checks?

 

From: Thomas Epperson [mailto:tho...@gm...] 
Sent: Thursday, January 27, 2011 2:13 PM
To: General mailing list for gumstix users.
Subject: Re: [Gumstix-users] External Power for USB

 

That should work.

On Thu, Jan 27, 2011 at 12:28 PM, William Pretty Security Inc
<bil...@xp...> wrote:

First of all I'm more of a hardware person, so my solutions tend to be
hardware based J

 

That being said, here is my proposed solution:

 

In the attached schematic, you use the +5V from the USB input connector as a
logic signal to turn on the FET.

Because FET's are voltage controlled devices, it takes very little current
to turn them on J

 

If you use a high current FET and a high current supply you could supply
AMPS to the USB device JJJ

 

What do you guys think ??

 

 

"People sleep peaceably in their beds at night only because rough men

stand ready to do violence on their behalf." - George Orwell

 


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-- 
Thomas Epperson
Build a man a fire, and he'll be warm for a day. Set a man on fire, and
he'll be warm for the rest of his life. - Terry Pratchett.

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