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Configure GPIO buttons in beaglebone



Hello everyone

I'm working with ANDROID ICS in beaglebone, There is no user buttons for android. but there is many GPIO in header. So i plane to use any of that GPIO for my menu button just i need MENU button alone through GPIO.  

My needs:

Connect the button in Beaglebone GPIO via Header --> Press the button --> get the MENU screen..!!

What the procedure to configure to enable the GPIO in beaglebone, What can i do for get the ANDROID menu screen if i press the GPIO button.

Whats are the files i've to modify in AOSP such mux.h or mux.c or board_evm335x.c or any other files.. 

Can anyone help me to do this..?

While browsing i got this link http://e2e.ti.com/support/embedded/android/f/509/p/207734/735908.aspx#735908 but its not much enough for me. its not making me clear 

Thanks in advance..