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Rockbox mail archiveSubject: Re: [PATCH,RFC] avoid radio noise on sansa clipplusRe: [PATCH,RFC] avoid radio noise on sansa clipplus
From: Stefan Seyfried <stefan.seyfried_at_googlemail.com>
Date: Thu, 08 Nov 2012 13:07:06 +0100 Hi Jonas, Am 08.11.2012 12:47, schrieb Jonas Wielicki: > On 07.11.2012 10:11, Stefan Seyfried wrote: >> On my sansa clip+, there is a quiet, ticking noise on weak fm radio >> channels. >> I found out that this is probably due to the cpu being woken up to >> update the display 5 times a second, even if the display is turned off. > This seems surprising to me. I expected rockbox to stop updating the > display, at least on the WPS, The WPS is a different screen than the FM radio screen, so it might behave differently. However, from a quick look at the code it seems to me that the WPS screen also does update 5 times per second, even if the display is turned off, but my understanding of the code is very basic at best for now and I need to find out how to use the debugging and logging infrastructure to actually verify my findings. > to avoid over-use of CPU while the display > is turned off, which might be the case for most of the time, e.g. on an > iriver target where you can bind the enabledness of the display to the > Hold key. > > In that context, I appreciate your work and would love to see it in > master some time, seems like that could increase battery lifetime. Yes, originally I only thought about the FM radio interferences, but battery life immediately came to my mind after thinking about that. I'll investigate this further. Best regards, Stefan -- Stefan Seyfried Linux Consultant & Developer -- GPG Key: 0x731B665B B1 Systems GmbH Osterfeldstraße 7 / 85088 Vohburg / http://www.b1-systems.de GF: Ralph Dehner / Unternehmenssitz: Vohburg / AG: Ingolstadt,HRB 3537Received on 2012-11-08 Page template was last modified "Tue Sep 7 00:00:02 2021" The Rockbox Crew -- Privacy Policy |