forked from len0rd/rockbox
e8c72b6891
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@25917 a1c6a512-1295-4272-9138-f99709370657
63 lines
3 KiB
TeX
63 lines
3 KiB
TeX
\subsection{Battery Benchmark}
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The \setting{Battery Benchmark} plugin enables you to test your battery's
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performance whilst using your \dap\ normally. Results can be submitted
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to the \wikilink{BatteryRuntime} wiki page.
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\subsubsection{How it works}
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Once loaded, \setting{Battery Benchmark} runs in the
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background recording various information about your battery to memory.
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A new point is written to memory every minute.
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Every time the disk is accessed for any reason
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(such as refilling the audio buffer, opening a directory or entering
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USB mode etc.) then the information in memory is written to disk.
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Once the memory becomes full (after many hours), then the data
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are written to disk anyway. This is done so that the data are not biased by
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excessive additional disk accesses. The file is written to the root
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directory of your \dap\ and is called \fname{battery\_bench.txt}.
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The plugin will continue to log info until:
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\begin{itemize}
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\item Another plugin is loaded.
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\item The \dap\ is shut down.
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\item The battery is empty.
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\end{itemize}
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Benchmarks can be resumed if
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you accidentally load a plugin, or turn off your \dap, so long as the log
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file \fname{battery\_bench.txt} is not deleted.
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\subsubsection{Information explained}
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At the top of the \fname{battery\_bench.txt} file is various
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information on how to use the plugin, followed by the data themselves.
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\begin{description}
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\item[Time] This column reports the total time of operation of the \dap. It is
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not the time that you started the plug-in. If you have your \dap\ on for 5
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minutes and then start the plugin, it will start measuring from 5 minutes.
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\item[Seconds] The same as \config{Time}, except measured in seconds.
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\item[Level] The percent level of the battery estimated by Rockbox, and not the
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actual battery level. The actual battery level can be seen from the
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\config{Voltage} column
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\item[Time Left] This shows the time remaining until the battery is empty,
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again as estimated by Rockbox.
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\item[Voltage] The battery voltage in mV at the moment the measurement
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was taken.
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\item[C] This stands for Charger. An ``A'' in that column shows if the power
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adapter was attached to the unit at the time of the measurement.
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\item[U] USB powered. Only for targets that support this. A ``U'' will indicate
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if the unit was using the USB port for power at the time of the measurement.
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\end{description}
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\subsubsection{Usage}
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The log file can be used to tell you how long the battery lasted (with some
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limitations, see below), but it is most useful for graphing discharge curves
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in order to improve Rockbox's estimation of battery level and time remaining.
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The battery log (\fname{battery\_bench.txt}) is in CSV format
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(comma separated variables) and thus can be easily imported into a spreadsheet
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or similar program.
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\subsubsection{Limitations}
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As \setting{Battery Benchmark} needs to write the data held in memory to
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disk in order to save them, it is possible that should Rockbox shut down
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due to low battery then there will not be enough power remaining to write the
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data to disk. Therefore all measurements since the previous save will be lost.
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