path: root/manual
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authorWilliam Wilgus <>2018-07-27 23:56:32 +0200
committerWilliam Wilgus <>2018-07-27 23:56:32 +0200
commit6f0320a9535bc1aa81d83fa879ac14d5ee603658 (patch)
tree3b12fc361595ecd2249f391e114036cb30150105 /manual
parent400603abdfb4ba7566e0cae8dbed9268f06716dc (diff)
As3525 v1/v2 Add power savings menu
Allow user to select cpu undervolt There have been quite a few issues across the SANSA AMS line related to CPU undervolting while most players show greatly increased runtime some crash. Rather than constanly upping the voltage we now have a setting with a safe value for all players and the option for lower voltages I plan to add a few other options here later such as disk timings and maybe some other clocks/experimental settings Added: Disk Low speed option for AS3525v2 devices cuts frequency to 12 MHz from 24 MHz Added: Disk Low speed option for AS3525v1 devices cuts frequency to 15.5 MHz from 31 MHz Added: I2c Low Speed AS3525 devices, should be bigger improvement for v1 devices Fixed: Debug menu for AS3525v2 No SDSLOT frequency, Showed IDE freq though it is unused Added: DBOP and SSP underclocking affects display on v1/v2 respectively Fixed: debug menu now has SSP frequency, and SSP_CPSR Update: made settings menu more generic Update: cleaned up code Added: Clip v1 & Fuze v1 didn't have HAVE_ADJUSTABLE_CPU_VOLTAGE. not sure why but, waiting on testing to confirm Added: C200v2 and E200v2 devices and HAVE_ADJUSTABLE_CPU_VOLTAGE. Fixed: v1 devices don't like display timing set lower (dbop) v1 devices don't have a divider set for ssp (causes divide by 0) Fixed: ClipZip display lags with Max SSP divider changed from 0xFE to 0x32 Fixed: v1 devices didn't work properly with highspeed sd cards Added code from Added powersave and IDE interface enable/disable Added: V2 devices now have powersave enabled on sd interface Update: cleaned up code, lang defines, added manual entries Update ssp clock mechanism added calculated ssp divider to clipzip Update turn display clock off when clip+ turns off display Fixed: clipzip wrong register for SSP clock Change-Id: I04137682243be92f0f8d8bf1cfa54fbb1965559b TODO: add other players?
Diffstat (limited to 'manual')
1 files changed, 24 insertions, 0 deletions
diff --git a/manual/configure_rockbox/system_options.tex b/manual/configure_rockbox/system_options.tex
index ff2967cec7..b279308e71 100755
--- a/manual/configure_rockbox/system_options.tex
+++ b/manual/configure_rockbox/system_options.tex
@@ -297,6 +297,30 @@ therefore result in better runtime.
+ \subsection{Power Saving}
+ These options allow users to increase runtime by lowering performance
+ of select subsystems. Certain options may \emph{not} be applicable to your
+ \dap{} or may cause undesired operation to your particular use case.
+ \emph{WARNING!} While every effort has been made to ensure the safety of these
+ options, due to manufacturing variance some options may cause unwanted side
+ effects, cause the \dap{} to crash or (while unlikely) even \emph{destroy}
+ your \dap{}. \emph{PROCEED WITH CAUTION}
+ \begin{description}
+ \item[CPU]
+ Allows lower voltages or cpu speed when enabled.
+ \item[Disk]
+ Allows slower disk operations when enabled.
+ \item[I2C]
+ Allows slower clocking of I2C device bus when enabled.
+ \item[Display]
+ Allows slower screen refresh rates when enabled.
+ \end{description}
\subsection{\label{ref:USB_HID}USB HID}