Here is another conversation of Stepmania for the PSP made in Lua. This one is by Joreofiorio35. Release notes:
Hi, this is my Stepmania Port for PSP. I have been working on this for the past couple weeks because I needed something like this for the psp. Only seconds after I posted version one, someone had P.M’ed me that he was making his own DDR for the PSP that would read DWI’s and SM files, etc. Then I knew I could stop working, his would be way better than mine! But for fun I continued and this is what I have so far, so thanks for trying this out! Version 2.0 Supports the Following:
DWI FILES BACKGROUNDS BANNERS 4th-192nd Notes MODS ASSIST TRICKS COMBOS COLORED ARROWS SONG SELECTOR
http://www.dcemu.co.uk/vbulletin/showthread.php?s=&threadid=13856