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Rockbox mail archiveSubject: Re: Rockbox for the playerRe: Rockbox for the player
From: Paul Suade <paul.suade_at_laposte.net>
Date: Thu, 12 Sep 2002 00:28:48 +0200 Well, maybe using an average for a short time might flat the flickering value; I mean using a small array like a ring to put your battery level and computing the average that way : int compute_vbatt_average (int new_vbatt) { static int vbatt_top; static int vbatt_sum; static int vbatt_num; static short vbatt_ring[VBATT_RING_SIZE]; // consider the sum of a ring (window) of 'vbatt_num' values, // so just substract the old value before adding the new value vbatt_sum += new_vbatt - vbatt_ring[vbatt_top]; // replace the old value with the new value vbatt_ring[vbatt_top] = new_vbatt; if (vbatt_num < BATT_AVG_SIZE) vbatt_num++; // advance or wrap the pointer if (vbatt_top < BATT_AVG_SIZE) vbatt_top++; else vbatt_top = 0; // compute the average battery level return vbatt_sum/vbatt_num; } This algo is O(1). ----- Original Message ----- From: "Chris Pimlott" <rockbox_at_chris.pimlott.net> To: <rockbox_at_cool.haxx.se> Sent: Wednesday, September 11, 2002 7:35 PM Subject: Re: Rockbox for the player > On Wed, Sep 11, 2002 at 02:10:54PM +0100, Stuart Tedford wrote: > > > In Rockbox, the battery indicator is very accurate. > > One minor quibble - over the course of an evening testing out > code, I was amused to notice that sometimes the the battery meter > sometimes went back up from a lower level to a higher level (without > being plugged in). I know that you can never really get an *exact* > reading on the battery level but it would be nice to see the minor > fluctuations taken care of. > > Perhaps we can use a different scale as change goes up and down, > i.e. when change drops from below 3V, lower it to 2 bars and don't raise > it to 3 bars until it climbs above 3.1V. This way, if it first reads > 2.99 then 3.01, the meter won't flicker between 2 and 3 bars. > > Chris Pimlott Received on 2002-09-12 Page template was last modified "Tue Sep 7 00:00:02 2021" The Rockbox Crew -- Privacy Policy |