Try to use an externally powered usb hub. On the nexus one the usb circuits of the chip were only powered through the usb itself. So in order to use OTG or pure host mode you had to supple power from outside. I can imagine this haven't changed in the Nexus S either. Have a look at this page for more details on that : http://sven.killig.de/android/N1/2.2/usb_host/ .
On Jan 28, 12:08 am, Steve Modica <mod...@small-tree.com> wrote: > I've been trying to get my Nexus S to act as a host via OTG. > > I've discovered that plugging in a microB to female A adapter that has the ID > pin grounded kicks the OTG code. The s3c_udc driver kicks out a message that > it's initializing and it attempts to bring up vbus power. That's where it > stops. I never get vbus. > > I've tried kicking on the regulators (ldo3 and ldo8 for vUSB 3.3V and VUSB > 1.1V in the mach-herring.c file but that doesn't seem to kick them on. I see > no power on the pins. (I've verified that the code is being called to > enabled them at boot). > > My suspicion is that the regulators are just not wired. It's a microB port > so maybe it's not able to drive VUSB. > > Comments? > > Steve > -- > Steve Modica > CTO - Small Tree Communicationswww.small-tree.com > phone: 651-209-6509 ext 301 > mobile: 651-261-3201 -- unsubscribe: android-kernel+unsubscr...@googlegroups.com website: http://groups.google.com/group/android-kernel
