From 6879dec6ece3c0797c5df16c9dd494b3dc3a1329 Mon Sep 17 00:00:00 2001 From: Lorenzo Miori Date: Sat, 4 Jan 2014 22:23:34 +0100 Subject: yp-r0: improve the charging code Some people reported strange charging times and strange battery life. Charging by OF: 25 hours; RB: 18 hours It has been found that there are at least two issues here: 1) the way of getting battery charging status wasn't really accurate. This attempts to fix that issue. This patch also simplifies some code (opening a device is no more needed, for example). To technically explain, battery charging implies first a constant current mode (where the voltage increases) and then a constant voltage mode (where, obviously, the voltage reads more or less the same). The old way the End Of Charge was detected was based solely on the voltage, while now it is based on chip's EOC interrupt, which should be more accurate. 2) OF explicitly sets a constant current 350 mA, while we usually had 55 mA (by as3543 default). This wasn't discovered before since there is a caching problem ("an accurate guess") in the Samsung power mgmt Linux module, thus its debugging dumper wasn't really working, reporting a 55 mA current. Strangely this option should have been set by the bootloader but apparently it does not. Some testing is still needed, but I confirm that with this patch I could run a benchmark for 25 hours (vs. 18 hours), by charging within Rockbox of course. Change-Id: I3bd921e86b9018d1cc3c720d15cc46896e8490b3 --- firmware/export/config/samsungypr0.h | 8 +++----- 1 file changed, 3 insertions(+), 5 deletions(-) (limited to 'firmware/export') diff --git a/firmware/export/config/samsungypr0.h b/firmware/export/config/samsungypr0.h index b27a1fa..212eaa8 100644 --- a/firmware/export/config/samsungypr0.h +++ b/firmware/export/config/samsungypr0.h @@ -122,11 +122,6 @@ #endif /* SIMULATOR */ -/* FIXME - * Lot of people reports bad battery life and funny charging times. - * Check what's going on... - */ - #define BATTERY_CAPACITY_DEFAULT 600 /* default battery capacity */ #define BATTERY_CAPACITY_MIN 600 /* min. capacity selectable */ #define BATTERY_CAPACITY_MAX 600 /* max. capacity selectable */ @@ -138,6 +133,9 @@ /* Linux controlls charging, we can monitor */ #define CONFIG_CHARGING CHARGING_MONITOR +/* We want to be able to reset the averaging filter */ +#define HAVE_RESET_BATTERY_FILTER + /* same dimensions as gigabeats */ #define CONFIG_LCD LCD_YPR0 -- cgit v1.1