Android USB OTG HOST

Most modern Android based devices support USB OTG function [1]. USB is a Host centric bus that means there is only one Host device and many different Devices can be connected to it. Using inexpensive USB-OTG cable it is possible to swich smarphone USB port from Device to Host, and connect external devices, if chipset and OS build allows this. Google provides detailed information on how to code USB Host [2] in your application.

[1] http://www.usb.org/developers/onthego/
[2] https://developer.android.com/guide/topics/connectivity/usb/host.html

Sony Xperia M5 Bugs

I have just bought next inexpensive Xperia M5 phone with pretty nice hardware. However I already found those things to be missing or deliberately removed:

  • USB OTG does not work (solved).
  • CardBoard VR does not work.

Update regarding USB OTG – “it’s not a bug its a feature” – after you connect a USB device using OTG cable you need to run “Detect USB device” application that will make OTG work. Considering security this may be a good choice to allow external devices by hand.

Mac OSX USB installer

In order to create OSX installer on USB memory drive you need to:

  • Download the Mac OSX Yosemite installer from AppStore on you Mac.
  • Create installation media from Terminal by executing following command (remember to adjust YOURUSBVOLUME value):

    sudo /Applications/Install\ OS\ X\ Yosemite.app/Contents/Resources/createinstallmedia --volume /Volumes/YOURUSBVOLUME --applicationpath /Applications/Install\ OS\ X\ Yosemite.app --nointeraction
  • Boot target Mac from USB by pressing ALT/OPTION key while powering-on the computer.
  • Remember to format target drive first with Disk Utility if you want to perform clean installation.