[maemo-developers] USB Host - Class 1 Bluetooth

[From: Daniel Blackburn]

I don't think the power should be an issue as Bluetooth adapters 
shouldn't be much more demanding that other USB devices that people have 
got working with the 770.  I am using a circuit similar to this one, 
http://www.hcilab.org/projects/nokia770/nokia770.htm. I will test my 
circuit with other simpler USB devices with comparable power usage but I 
think the problems will be more related to software than hardware. I 
don't have much experience with drivers on Linux so that is the bit were 
I am worried I might have overlooked something crucial.  

Cheers,
Dan

Allen Brown wrote:
> This is tangential to what you are asking about, but I think you
> could run into a problem with your power injector. It's been a
> few years since I read the USB specs, but as I recall the host
> knows, and makes decisions based on, what power is available.
> Also it switches that power on and off depending on what state
> the "bus" is in.  There could be problems if the actual power
> doesn't match what the host thinks it is.
>