Opening an ISO
Drag and drop the .iso/.img/.bin file or click 'Browse'.
If a game contains multiple ELFs the following window will appear

When it is possible to automatically tell which ELF is the main ELF then that ELF will be pre-selected.
If no ELF is automatically selected then select one. Press "Ok" to load the ELF.

Opening an ELF
ELF files can be found using Elf Extractor (PS2 Hacking Toolkit)
Drag and drop the ELF file or click 'Browse'.

Remapping
Select the input to change and scroll through the list of inputs to select what to replace it with
PS2 Controller Remapper makes sure that every input can be mapped to only one other input - this is by design

Options
Selecting the 'RAW Code' radio button generates codes in unencrypted 'RAW' PS2 cheat code format - compatible with ps2rd and Codebreaker 9.3+
Selecting the 'PNACH' option generates codes in PCSX2 cheat code format (also compatible with PS2 Patch Engine and ps2rdmod (ps2rdmod (ps2rd w/PNACH support)))

Finally
Hit the 'Remap' button, copy or save the code and enjoy!

Received error "File is not a valid ELF or CD/DVD image"
The file is not supported or is broken.

Received error "Unable to locate controller routine"
The selected ELF is not remappable.

"The code did not change the controls or screwed up the controls"
Try the following
In the 'scePadRead hook address' drop down try selecting a different address, if there are no others or the others do not work please report the game here.

"Why are the codes so long?"
See the Technical FAQ.

"Can you explain how to use cheat codes to me?"
No - Google is your friend.

"I have not used this program, is it compatible with game XXX?"
Try it and find out.

"Does this work with scePad2Read games"
Yes.

"Can this be made into an ELF hack"
Remapping codes can be applied directly to disc images using PS2 Patch Engine.

"Why are the codes so long?"
The codes are long because PS2 Controller Remapper dynamically writes a function to process the controller's data structure to match the specified remapping, the functions generated are extremely well optimized and in most cases can't be made shorter.

"Does this impact game performance?"
In my testing - no, although it does slow down the controller's read function considerably. Fortunately a few extra cycles are generally not a big deal for a 290+mhz CPU.

"Are there any known incompatibilities?"
Yes
Controls will not be remappable in digital (PS1) mode, some games begin in digital mode by defaut (Ridge Racer V). Enabling analog mode by pressing the "mode" button will allow the controls to be remapped properly.
Some games may load libpad or libpad2 from an IRX - in these cases ELF analysis can't locate the scePadread/scePad2Read function.
There may still be some versions of libpad which are not profiled - if you have a ton of games lying around (more than 100) let me know, you may be able to help me discover new versions and increase compatibility.

* PS2 Controller Remapper v1.10
* PS2 Controller Remapper v1.00