On Thu 2020-10-22 11:34:34, Bollinger, Seth wrote:
> 
> >>> Yeah. Don't do that! :-). For solid on/solid off, just turn the
> >>> trigger off. For blinking, use timer trigger.
> >> 
> >> If I want to go from on or off to flashing, I need to set the timer trigger, which results in a 500 ms flash rate until the real rates are set.  This results in a noticeably different first blink.  I guess we’re looking for smooth control of the LED.
> >> 
> > 
> > Okay, that's fair requirement, I guess.
> > 
> > If you have proposals how to solve this in a nice way, go ahead.
> > 
> > As a hack...
> > 
> > I believe you can go from on to off like this:
> > 
> > on:9999,off:0 -> on:9999,off:1 -> on:1,off:9999 -> on:0,off:9999.
> > 
> > (And I believe we should document this somewhere).
> 
> 
> I hate to respond to this, because it makes me look stupid, but…  :)
> 
> The problem turned out to be that the original author was using buffered IO to do the sysfs writes (which I didn’t notice until yesterday).  When I switched to a different method, the writes were ordered correctly and didn’t glitch.
> 
> Apologies for bothering you all, and great thanks for your assistance!

Hehe, okay. Good that it is solved.

(And yes, such bugs happen, forgetting about buffered i/o is quite
common).

Best regards,
								Pavel

-- 
http://www.livejournal.com/~pavelmachek