FredHS

Hi,

I am looking for a method to connect 2 external switches as binary input devices to my Dell Axim x50v. Building a microcontroller interface (switches => microcontroller [transmitting serial commands] => FT232 [or similar USB interface IC] => Axim) would be one solution, but this appears to be overkill. What I am really wondering is how the USB DATA+ and DATA- lines are connected to the controller. The closest answer I found was here: handhelds.org/moin/moin.cgi/DellAximX50Hardware (Sorry, since this is my first post I am not permited to post a full URL.)

Still, I am not certain if the USB data lines are directly connected to the Axim's PXA270 or if there is another IC in between.

Alternatively, I could use the RTS and CTS lines (GPIO40 and GPIO41) -- has this been tried?

Ideally, I am looking for 2 lines that can be periodically polled by directly accessing a GPIO register without much overhead from drivers etc.

I'd appreciate any hints.

Fred

FredHS

My apologies for posting this x50v related question in the x51 section ... hope any answer would apply to either type of PDA.

Bill_Todd

Read this

Hacking PXA270 internal USB HOST

__________________
Bill

FredHS

Hi,

Originally Posted by Bill_Todd

Read this ...

(strange, since I am new to this group I am not allowed to quote the URL.)

thanks for pointing this out. I had looked at that thread a couple of days ago, but was under the impression that the final word is not out yet (except for the fact that Port2 is in use). Well, at this point I will study the PXA270 manual and see what I can learn.

Fred