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The question is simple I think. All we have encounter gagets that they don't fuction while they are in charge, like cameras or mp3 players. But, we know that cell phones or laptops can have full function, when they charge with a charger, like USB connector.

Is it in the programming? Why this happens? Can we change that with some device e.g. controlling the charging?

I want to use a portable USB charger for my mp3, but I can't wait 3 hours for it to charge, because I cannot listen to music. It notices the charger, and gets in charge mode. Nothing functions until I unplug it.

Thanks a lot

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closed as not a real question by ChrisF, RedGrittyBrick, Nifle, 8088, KronoS Sep 11 '12 at 17:58

It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center.If this question can be reworded to fit the rules in the help center, please edit the question.

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Yes, typically this is down to the firmware and so the behavior is actually by design by the manufacturer/programmers. –  Dave Sep 11 '12 at 9:00
    
if not then make a requirement that it can be used while charging, when you get a new one! –  barlop Sep 11 '12 at 9:54
    
Actually, it is not the charging that is the issue, but the data connection. For example, if you plug it into a USB wall-charger or a powered USB port on a hub or computer that is off, almost all devices will continue to work. It is only when you connect them to a running computer that the device switches to “charging mode” and cannot be used normally. This depends entirely on the device. Some do this while other don’t and may depend on the nature of the device or just the whims of the devs (it may be easier to implement that way. –  Synetech Sep 11 '12 at 20:47

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