Hello Frank, thanks for your reply! The GPS receiver plays the role of the USB device and the tab is the host. They are connected by an OTG cable which seems to work.
I have tried an active USB hub now, but the result is the same. When I connect a mouse to the tab or the hub, a cursor appears and I can use the mouse. But the mouse doesn't exist in the UsbManager's DeviceList either. May it be that the API is not fully implemented on my tab?! Regards Nico On 16 Jan., 09:20, FrankG <[email protected]> wrote: > Hello Nico, > > you didn't said which device type your GPS receiver plays. > > But from the dmesg output it seems that their might be a problem > with the power supply for your external device ?? > > <6>[ 2786.151489] msm_otg_suspend: usb in low power mode > <6>[ 2786.842376] cpufreq: cpu 1 is not active. > <6>[ 2789.192687] msm_otg_resume: usb exited from low power mode > > Did you provide explicit power for your device ? > > Good luck ! Frank > > On 13 Jan., 08:58, Nico Guth <[email protected]> wrote: > > > > > > > > > Hi! > > > I have a USB device (GPS receiver) which I want to connect to my > > Android 3.2 tablet. > > The device is somehow recognized by the system and a ttyACM0 node is > > created in /dev. But here my problem starts: how can I get access to / > > dev/ttyACM0 without root access rights? I also tried to use the > > UsbManager etc. from the API, but here the device is not listed. > > Another program from the market (USB Device Info) also couldn't find > > the device via API but only by parsing /sys/bus/usb/devices/. > > > Is there a way to send/receive data to/from the device without rooting > > the tab? > > The tab is a Huawei MediaPad. > > > Here is an excerpt from dmesg: > > <6>[ 2781.888427] msm_hsusb_host msm_hsusb_host.0: Qualcomm On-Chip > > EHCI Host Controller > > <6>[ 2781.897521] msm_hsusb_host msm_hsusb_host.0: new USB bus > > registered, assigned bus number 1 > > <6>[ 2781.905059] msm_hsusb_host msm_hsusb_host.0: irq 132, io base > > 0x12500000 > > <6>[ 2781.911712] usb usb1: New USB device found, idVendor=1d6b, > > idProduct=0002 > > <6>[ 2781.918243] usb usb1: New USB device strings: Mfr=3, Product=2, > > SerialNumber=1 > > <6>[ 2781.928039] usb usb1: Product: Qualcomm On-Chip EHCI Host > > Controller > > <6>[ 2781.933380] usb usb1: Manufacturer: Linux 2.6.35.11 ehci_hcd > > <6>[ 2781.938995] usb usb1: SerialNumber: msm_hsusb_host.0 > > <6>[ 2781.946319] hub 1-0:1.0: USB hub found > > <6>[ 2781.949035] hub 1-0:1.0: 1 port detected > > <6>[ 2786.151489] msm_otg_suspend: usb in low power mode > > <6>[ 2786.842376] cpufreq: cpu 1 is not active. > > <6>[ 2789.192687] msm_otg_resume: usb exited from low power mode > > <6>[ 2789.349945] usb 1-1: new full speed USB device using > > msm_hsusb_host and address 2 > > <6>[ 2789.507843] usb 1-1: New USB device found, idVendor=152a, > > idProduct=8230 > > <6>[ 2789.513580] usb 1-1: New USB device strings: Mfr=1, Product=2, > > SerialNumber=0 > > <6>[ 2789.530883] usb 1-1: Product: Septentrio USB Device > > <6>[ 2789.534729] usb 1-1: Manufacturer: Septentrio > > <6>[ 2789.543395] cdc_acm 1-1:1.0: ttyACM0: USB ACM device > > > I hope you can help me.... > > So long, > > Nico -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
