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Rockbox mail archiveSubject: Re: LCD backlight dimmingRe: LCD backlight dimming
From: Linus Nielsen Feltzing <linus_at_haxx.se>
Date: Tue, 16 Mar 2004 08:32:10 +0100 roland wrote: > does somebody know, at which rate the led`s of the display can be > switched on/off? maybe dimming could be done by switching the display > on/off very quickly - by software. On the recorder, the backlight is controlled by the Real Time Clock, using a square wave output. The square wave can have different frequencies in 16 discrete steps from 0Hz to 32kHz, but the duty period can't be changed, it's always a square wave. So we can forget dimming on the recorder. On the player, however, the backlight is controlled by a port pin, so there is a possibility to dim it by toggling the pin. I'm not sure I see the point in doing so, but some people may find it "cool". > at least, there have been recorders out there which were able to dim > (i saw a videoclip somebody posted on this list). do we know that was > a hardware or a software-based dimming? Yes, there is a hardware flaw in some recorders, especially FM and V2, which causes the backlight to dim slowly instead of turning off. I have not been able to control this behaviour, and certainly not control the dim rate. Linus _______________________________________________ http://cool.haxx.se/mailman/listinfo/rockbox Received on 2004-03-16 Page template was last modified "Tue Sep 7 00:00:02 2021" The Rockbox Crew -- Privacy Policy |