This is a simple plugin I made a long time ago for my personal use. I just found the source code while going through some old stuff on my computer, so I thought I'd clean up the code a bit and release the plugin.
I realize that there are other plugins that feature similar functionality but I wrote my own because I wanted to be sure its coded optimally, as there are a few careless ways in which these functions can be improperly used (the point of this after all is to conserve battery life).
It does the following when the Hold switch is enabled:
* Switches off the LCD backlight.
* Switches off the actual LCD screen.
(This is important because the backlight and actual screen are two different things. You can have an image being displayed on the screen while the backlight is switched off, such that you can see the image if you use a flashlight. You can also have the screen switched off while the backlight still illuminates the powered off screen.)
* Underclocks the CPU to 60MHz
(Sony has changed the clock speed functions such that only certain combinations of speeds work correctly. Simply trying to underclock to arbitary values will result in the CPU simply running at the stock speed. I have verified that Hold+ successfully underclocks to 60MHz.)
* The original screen brightness and clock speed are restored when the Hold switch is released.
* Prevents the PSP from going into suspend mode if you accidently push the power switch too far when turning off Hold mode.
* Allows complete operation of the PSP controls with the display turned off.
* Turns off LEDs in hold mode. LEDs are flashed once in 30 seconds so that the PSP is not mistaken to be powered off.
* While in hold mode, allows the use of Left, Right, LTrigger, RTrigger, Volume and Start buttons, if you hold the Select button first. Useful to skip songs, pause etc.
Usage:
Turn on the Hold switch to automatically disable the display and underclock the CPU. Turn off the Hold switch to return the CPU to normal speed and enable the display.
If you push the ANALOG UP button when turning on the Hold switch, it will only lock the keypad like normal hold mode. The display and CPU speed will not be changed, so that you can watch videos etc. with the keypad locked.
If you push the ANALOG UP button when turning off the Hold switch, the display will remain switched off and the CPU will remain underclocked, but you can operate the PSP. To return to normal, push the power switch to the suspend position, or just press the Screen button.
While the PSP is in hold mode, if you first hold down the Select button, you can use the following buttons: Left, Right, LTrigger, RTrigger, Vol+, Vol-, Start.
Installation:
You can install it in the seplugins folder, and make an entry in VSH.txt. Thus it will be active in the XMB. Its also possible to use it in games by adding it to GAME.txt, but some games may crash etc., if the CPU is underclocked to such a low value.
Optionally, its also possible to install it in your PSP's flash0 so that it will work without a Memory Stick. For this you can use FreePlay's "NewBTCFNedit" and enable it for VSH mode in the all the PSPBT?NF.bin files. Add it before vshmain.prx.
Advanced:
If you want to change the clock speed to your own values, you can use a hex editor to change them. The offsets in the file for v3.4 are
0xD18 - CPU
0xD1C - Bus (Should be half the CPU speed or less)
The values should be entered in hexadecimal. The default value for CPU is 3C (60 MHz in decimal) and the default value for Bus is 1E (30 MHz in decimal).
Note that simply using any arbitrary value will not work. You will have to test and see which values for CPU and Bus speed work.
Credits:
Thanks to adrahil for helping with preventing the suspend mode.
Thanks to Booster for the SysCon Hook sample, based on which Hold+ v3.0 was updated.
Thanks to Total_Noob; As his plugin MusicHold was not compatible with Hold+, with his permission I've implemented the same features in Hold+ v3.0 for people who wanted some buttons to be usable in hold mode.
Changelog:
Fixed a problem caused by a faulty Hold switch in some PSPs. This made the CPU remain underclocked even after turning off the Hold switch.
The problem is the Hold switch doesn't consistently return a pressed state. It sometimes rapidly fluctuates between an Off and On signal. If this fluctuation occurs within one iteration of the main program loop, it causes problems. Its not humanly possible to toggle the Hold switch so fast, but a loose connection can :P
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