usb receptables from old motherboard => gender changer => usb host cable?

Jim Morris ml at e4net.com
Thu Aug 7 21:19:40 CEST 2008


For those who can't solder maybe this would work too

http://www.amazon.com/USB-Type-Female-Coupler-Adapter/dp/B000I97N0S

I will give one a try.

Timo Juhani Lindfors wrote:
> I tried this "USB gender changer" and the voltage levels seem to go
> just about right:
> 
> normal pc usb port
> ==================
> 
> black GND
> green 0V
> white 0V
> red +5V
> 
> freerunner as device
> ====================
> 
> black GND
> green 0V
> white 0V
> red 0V
> 
> freerunner as host
> ==================
> 
> black GND
> green 0V
> white 0V
> red +4.98V
> 
> However, usb devices don't seem to work. Even the simplest USB
> extension cable with LED does not turn its LED on. Any idea how I
> should debug this further? I am using
> 
> echo "host" > /sys/devices/platform/s3c2410-ohci/usb_mode
> echo "1" > /sys/devices/platform/neo1973-pm-host.0/hostmode
> 
> from http://wiki.openmoko.org/wiki/Neo_1973_USB_host to turn host mode
> on and the following rootfs and kernel:
> 
> http://buildhost.openmoko.org/daily/freerunner/200807/20080722/Openmoko-openmoko-devel-image-glibc-ipk-P1-Snapshot-20080722-om-gta02.rootfs.jffs2
> 
> http://buildhost.openmoko.org/daily/freerunner/200807/20080730/uImage-2.6.24+git25+8533927964761f4e2078ccd8607b90f5acc60b93-r1 -om-gta02.bin
> 
> Maybe the ID pin in the openmoko usb cable somehow causes trouble?
> 
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> 


-- 
Jim Morris, http://blog.wolfman.com




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