forums.ps2dev.org

tkondal · Joined: 25 May 2006 Posts: 8

Hi guys, I've been reading this forum for a while now; this is the first time I'm posting and hope to get some good hints and advice.

Here's what I want to do...

I saw that the PSPSDK has a set of functions for USB development (sceUSB...). I would like to know how to use these functions so that I can access a USB device attached to my PSP. I read previous posts about the USB port but couldn't get any info that related to the SDK. Let's say I have a logitech webcam attached to my PSP, how do I write a driver for it? Any help would be good.

Thanks.

Jim · Joined: 02 Jul 2005 Posts: 487 Location: Sydney

I'm pretty sure the current thinking is the PSP is a USB client only. It can't host other USB devices.

Jim
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KPOT0B · Joined: 09 Mar 2006 Posts: 9

Its expected to connect at least camera and gps - so psp shall support both functionality(means client and host).

Drakonite · Site Admin Joined: 17 Jan 2004 Posts: 989

tkondal · Joined: 25 May 2006 Posts: 8

If that's correct, then it's too bad. The USB port feature is very limited then. I was hoping that the PSP could be used to send/receive signals (or data) through that port.

KPOT0B · Joined: 09 Mar 2006 Posts: 9

Drakonite · Site Admin Joined: 17 Jan 2004 Posts: 989

Erm... you obviously know little to nothing about how usb works...

I've gone over this numerous times on the forums and on irc, so I'm not going to bother going into why it's not only trivial for sony to do things by having the psp as client and the addon devices as the hosts, or why it's actually a smart move (for them) to do so...

Nor am I going to go over the exact details of how you can know the psp is truely client only; you can search the forums for my other posts if you want to have a step by step explination.

I'm just going to say this... the PSP does not meet the specifications of a USB OTG device. If they were to try making it act as a USB-OTG device it would violate the specifications and would never pass compliance testing.

If you don't believe me then feel free to read the 100s of pages of documentation over USB specifications at http://www.usb.org

PSP is not USB-OTG okay? And gets getting really annoying to have people repeatidly bring it up and say things such as "oh it'd be cool if we made devices that _____!!111!!one" I've been leanient, as people who don't know what is going on have spread a lot of misinformation in the past, but from now on I'm treating it as the idle speculation it is and as such locking threads as per the rules of these forums.
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KPOT0B · Joined: 09 Mar 2006 Posts: 9

I would love to discuss that here again. Cause psp has no stand alone host chip - just phy - what is in cpu nobody knows - and it might be anything. And there are phy chips which may be turned to host or func modes on fly.

btw I worked for USB since NT4 - bunch PC host drivers, bunch functions for variouse chips, couple of embedded usb cores, class drivers (include storages) and etc. if it actually sounds to you familar ;)

dot_blank · Joined: 28 Sep 2005 Posts: 498 Location: Brasil

just end this thread simply by me saying that

USB OTG uses a different cable connection/protocol
entirely different than psps mini USB B
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laichung · Joined: 06 May 2005 Posts: 123

As you said that you have experience in USB development , may I ask you a question , can you change a USB client in SOFTWARE way to having some USB HOST functions , such as power up a USB client? Thank you.

Drakonite · Site Admin Joined: 17 Jan 2004 Posts: 989