+++ Glen VanMilligan [04-12-01 10:21 -0800]:
> Here is my USB power issue, this was sent to the Balloon list.
OK - this (list) message doesn't seen to have made it to me yet. I wonder
where it has got to.
> ---------- Forwarded Message ----------
>
> Subject: How do I test the USB ports?
> Date: Tuesday 30 November 2004 10:38
> From: Glen VanMilligan <glenv@vpcvalley.com>
> To: Balloon <Balloon@balloonboard.org>
>
> I made a cable with a A-type usb connector on it to plug into J16 and J15. I
> put a scope on the lines on J16 and find no +5 volts, although I find it on
> J15.
Hmm -there may be some number confusion here. Looking at the
top_compnents.pdf layout diag then the 3 USB connectors on the top are:
J15, J7, J16 (closest to J1 - serial/Jtag)
This is different to the numbering on the clickable image map pic of the
board on balloonboard.org/hardware/205/index.html (which numbers them
J20,J18,J19 (which are the equivalent duplicate sockets)
In fact I can't find J20,18 and 19 at all on the layout files - steve -where
are they supposed to be - do they in fact exist?
If someone (steve/dave?) can tell me which doc is correct, I'll try and make
sure they all match up.
Anyway, to get to the substantive issue:
OK - yes, I am only seeing +5V on the two outer conectors - J15 and J16, but
not he middle (slave) one - J7. That appears to be correct from the circuit
diagram, and makes sense - slave devices (can) take power from the host.
IS that the same as you are finding Glen?
> When I plug a memory stick into the J15 (A type connector) I was
> expecting to see data toggling on the +data and -data lines, but only see
> between 3.0 and 3.8 volts on the +data line (tried 2 different memory
> sticks). Is there a software test I can run to see if those ports are
> actually working?
I can't replicate this as I don't have an inline USB socket to make up a
suitable cable with. I'll get one.
Who else has used the USB host functionality on balloon?
Dave your hyra hsa a USB webcam does it not?
> Will the A-type USB port support a USB keyboard as a test?
It should do. It's just a matter of installing the right modules. As even I
think nick is person who has actually used this most.
> Other suggestions for debugging the USB ports?
For the USB host stuff I can't help much until I sort out a cable.
I'm goingto experiement with the slave stuff some more right now.
Wookey
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