forums.ps2dev.org

Hey,

I'm working on implementing the OBEX protocol for the PSP. It will allow the PSP to communicate with many more devices (including most mobile phones with IR) and essentially/eventually send files to them...

Thanks,
~apsd

Almost two months ago, before I got busy with the infrared stuff, I wanted to write a first emulator and got advice from ector to start with Chip8 interpreter... About three days after I wrote a working version on my computer, I ported it to the PSP and ever since it has been sitting here... I've fi...

Nice program CPHartman. Glad there are some other coders using infrared here. @Arwin I am working on writing (and sort of porting) an OBEX library for the PSP. This will definitely help the PSP connect with many other devices (and allow many other PSP programs to do so). So expect something soon! Ke...

The infrared keyboard project doesn't make much sense to me sense the port is on the top.. :-/ But it's still a cool project to have working... I'm going to start working on the OBEX project shortly... this will definitely open functionality/compatibiltiy with many other devices out there. I'm not s...

I'm pretty sure the IrDA port is controlled entirely through software and that there is no extra controller packed with the IrDA port to deal naturally with other "IrDA enabled hardware". TV companies have developed their own "codes" for TVs and what-not which can be dealt with i...

Awesome, thanks for the links.... I've been thinking of developing a remote control like program based on something like lirc (unless somebody has already claimed this - i'd be glad to help :-) )... Still thinking about it though. The OBEX project is another option. The remote control project and OB...

Question On The Capture Program ... Can We Re-Emit The Signals We Capture ... If So How Do I Go About Doing It ? I wrote a quick program to emit the data of a file you select in response to your question... But, when I tested by capturing data from a remote control with IrDA Capture and then sendin...

I wrote that quick IrDA Capture program by suggestion of Arwin..

Here it is: http://www.breezynet.com/pspirdacapture.zip

The source is included. It displays what it captures to the screen and also writes it to ms0:/irdacapture.

Thanks,
~vsergeev

Arwin, Capture just what it finds? Wait 30 minutes for a pm :-) The major protocol that I know for infrared between PDAs and cellphones is OBEX... in fact, there is a project called OpenOBEX that has all of this protocol code implemented. You can transmit differnet kinds of content through OBEX, (li...

The receiver doesn't give any message until it finds a sender...

Yeah, next version will definitely be smoother, I'll start cleaning it up now...

This version is pretty sensitive and vulnerable to disruptions but works well when everything is stable... You can probably get the feel and sensitivity of it if you place the two PSPs on a desk. First start the receiver side then start the sender side.. Select the file and let it transmit... Be sur...

I've written a program to transfer files from one PSP to another via infrared. The major limitation is that the received file is put directly in the memory stick root, but this will be flexible in the next version. It's moderately slow, but it works :-) (next version will be optimized). The program ...

Hmm... Is it really that difficult to access the traces? I've never done this kind of electronics work so I wouldn't know. I was thinking you could use something like an exacto and peel off a few top layers (lol)... then hook up to the lines... If that's ^ not feasible, then I guess you'd *have* to ...

ok I think this is a good time to say: Where do we go from here? If you mean for electronically extracting data off hte 32mb flash chip, first you need to know how to use it. I have some experience with SRAM chips and I know that most memory chips in general share a somewhat similar interface (for ...

Ah, nice find gorim. That explains all the DRAM stuff. Andy, yeah, I guess in the end it all works out :-D Back to the post topic, given the firmware is stored raw (presuming it is) in the 32mb flash, what is the obstacle in the way other than the physical access? I'm going to do some more research ...

4mb does sound a little high... and now that I think of it, it doesn't make much sense. Most CPUs on our PCs have caches up to 1mb, and that's it. But if it were the video framebuffer, why didn't they put it near/in the graphics controller itself? Maybe it's a scratchpad for decryption of the encryp...

andy is probably right, it would make sense for the 4mb to be simply cache. andy0482, see hte link that ooPo posted: http://forums.ps2dev.org/viewtopic.php?t=935 The samsung chip that holds the 32mb SDRAM also happens to hold 32mb flash ... just all on one chip. MrBrown, http://www.chipworks.com/Web...

Right gorim, I understand. What is the difficulty in extracting the flash? I understand that the package for the memory is a pain in the ass, but I'm sure it could be eventually desoldered, or even accessed while onboard. Is there any additional known documentation on the memory chip apart from the ...

Yeah, that all makes more sense...

I guess I never understood DRAM from the start. :-)

My question was what could be stored on it?

Just generic OS memory?

Hmm, that's a good point ooPo...

I didn't know it was both 32mb SDRAM and flash.

Then what's the purpose of the DRAM? A loader to the main firmware?

Or maybe there is code on it that can flash the flash half of the samsung chip?

][eBerg, DarkFader, br33zy (me), and others (sorry if I didn't mention) had a disucssion in the #pspdev channel on an approach to electronically extract the firmware, and this is pretty much the sum of it: * Sony took the Mips R4000 microprocessor (or one from the series), developed and packaged it ...