Generic USB-Slave to USBhost converter

Quite a lot PDAs supporting USB-host, but for only a few an adapters or appropriate cables from the manufactures are available.

As these devices support USB-Slave as well I would like to know if there's a way to convert the USB male connector (used as slave e.g. for sync with the PC) to a USB-host female in order to connect accessories (keyboard, mass-storage devices...).

According to wikipedia the configuration of the pins shouldn't differ too much for slave and host mode.

Pls. see attachement, that's what I found regarding this question. It's a picture showing a similar configuration (as new user I'm not allowed to post external links, thanks to ab21cn
from xdaflameusers)

But it's a male-to-male converter and furthermore a converter from "big usb" to micro (mini?) usb. As there're already standard converters for the different sizes of USB I would like to start with the biggest size and to buy the appropriate converter as needed.

Does anyone has a circuit diagram or any other idea for such a generic converter?

thx

thanks for the links. but i'm a little bit afraid of connecting something to my pda which has an own power supply, the risk of a burn-out is given. i've got a nautiz x5 with 4400mA battery which should have enough energy to supply usb-power to connected devices.

I think I'm going to contact the manufacture of my device, maybe this works for me, but a generic adapter would be of use for anyone.

the chips used for usb should be of the shelf as i don't think each manufacture develops an own logic for usb... but this doesn't imply that the cabeling is standard too.

what the heck makes manufactures providing features in their products which the users can't take advantage of?

yes

primary i want to connect usb mass storage devices to my pocket pc. gamecontroller or keyboard would be a good thing too.

my devices doesn't have a standard usb plug, the only thing i got is a adapter from the properitary plug of my device to standard usb male connector, but this is meant for usb-slave use only.

the underlying qeustion is, if there's a way to convert usb-slave to usb-host using the same pins. if it needs an additonaly pin then i don't see a way to convert it as i don't know anything about the pins cableing of my properitary plug.

a week ago i found an adapter which was able to convert the male usb to another male usb... but it didn't work.

the problem is compareable to datatransfer between two pcs via usb - it's possible, but only using properiatry hardware and drivers...

so i think there's no way to solve this problem in a generic way.