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keypad interfacing with beaglebone black



HI sir,

            in my beagle bone black i have developed gtk application using c. i have control my application through keyboard and mouse. instead of controlling keyboard

and mouse i want to control by keypad. in my keypad only have  Five button the button function are following,

key1->up arrow

key2->down arrow

key3->left arrow

key4->right arrow

key5->enter

i don't know how to do this could you help me..

thanking you,