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
