Future Button and LED software spec

Tilman Baumann tilman at baumann.name
Mon Apr 21 12:53:31 CEST 2008

Gerald A wrote:

> I'm not sure how doable it is, but rather then blinking, perhaps it 
> could slowly fade up and down, akin to how some of the Mac stuff does, 
> like iMacs and Macbooks, to let you know they are powered up but LCD is off?
> I know technically it's possible, but I'm not sure if the 
> electronics/kernel bits support steps or just a simple on/off. An answer 
> on this would facilitate more discussion.

I thought of that too.
Doing it purely in software will probably not be a good idea. Starting 
with the problem that it will not work while the processor is sleeping.

Phillips has some nice i2c controlled LED driver which can do this 
afaik. But it's too late for hardware changes. :)

A simple PWM controller would at least support dimming the damn thing.
Fading is just cheap eye porn. We need this. ;-)

I could not find any schematics on the wiki (are there any?). So if 
anyone who knows could comment on dimability of the LED?


More information about the openmoko-devel mailing list