71 lines
4 KiB
TeX
71 lines
4 KiB
TeX
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\subsection{Battery Benchmark}
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The Battery Benchmark Plugin enables you to test your battery's performance,
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while making normal use of your \dap. Once loaded it will run in the
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background (TSR plugin), reading various info about your battery while you use
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it. Once you finish your session you can find the benchmark output data in a
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file on your \dap\ \fname{/battery\_bench.txt}.
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Please submit your results to the Rockbox wiki.
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\url{http://www.rockbox.org/twiki/bin/view/Main/BatteryRuntime}
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\subsubsection{How it works}
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After you load the plug-in the operation of your \dap\ continues as normal.
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You can do whatever you could do before loading the plugin except loading
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another plugin. If you happen to load a plugin while benchmarking, a splash
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screen will inform you about the termination of the benchmark.
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While you operate it will log various battery related information every time
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the disk is activated by external causes, (buffer refill, open folder,
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USB mode) or an hour passes without updating the log file.\\
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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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Between disk activity (or an hour), it will log info in memory (every
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measurement is captured when the voltage changes). If there are too many
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measurements older entries will be deleted and the log file will inform the
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user about the interval where entries were lost. Benchmarks can be resumed if
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you accidentally load a plugin, or turn off your \dap, as 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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On the top of the file you will see various info on how to use the plugin.
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\begin{description}
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\item[Time] It is the total time of operation of the \dap. It is not the time
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that you started the plug-in. If you have your player on for 5 minutes and then
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startt the plugin, it will start measuring from 5 minutes.
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\item[Seconds] As time, it shows time passed in seconds. Nothing special, it is
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there because it is free and maybe someone might want to make graphs with
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seconds.
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\item[Level] The percent level of the battery estimated by Rockbox. This is an
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estimation and not an accurate result. Using the real percentage (current
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battery voltage / top battery voltage) * 100) we can calculate the difference
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between the estimation. Goal of this column is to make the estimation algorithm
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of Rockbox more accurate.
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\item[Time Left] It shows the estimated (by Rockbox) remaining time until
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shutdown. Again, as Level, this column can be used to see differences between
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real time left and estimated time left. This could help make time left more
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accurate.
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\item[Voltage] The current, battery voltage, the moment the measurement was
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captured. Measurements are captured when this number changes while benchmarking.
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This column can be used to give quite interesting graphs in a spreadsheet
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program. (Excel, Calc, e.t.c)
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\item[M/DA] (Measurements per Disk Activity) The number of measurements stored
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temporarily in memory, before written on the log file. This can give you an
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idea on how many voltage changes are between disk activity (or one hour).
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\item[C] Stands for Charger. An "A" in that column shows if there was the power
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adapter attached to the unit, at the time of the measurement.
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\item[S] The "S" column shows the state of the device (Charging, or not). The
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"C" indicated that the unit was charging when the measurement was captured.
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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 powering.
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\end{description}
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\subsubsection{Making graphs}
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While you can tell how long your battery lasted, with a single look at the last
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line of the battery log (\fname{/battery\_bench.txt}), the most useful purpose of
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Battery Benchmark is to make graphs using a spreadsheet program like Excel or
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Calc. The battery log (\fname{/battery\_bench.txt}) is in CSV format (comma separated)
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so you can quite easily import it to a spreadsheet program.
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