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Interfacing 3X4 matrix keypad to TI8148 gpio and PSP used is linux-04.01.00.07.

sudheer singh1
Expert 1435 points

 Hi,

I have interface a 3x4 keypad matrix to TI8148 GPIO pins and PSP used is linux-04.01.00.07.

It has 3 colums and 4 rows.

Four row lines are pulled high.

I want to use the input subsystem GPIO matrix keypad driver for it. For that I have provided the platform data in board specific file and enabled the "matrix-keypad" driver support (drivers/input/keyboard/matrix_keypad.c). It is coming up with /dev/input/event0. From application when I am reading the /dev/input/event0 for key.code, it is showing three keys pressed.

output for 1 key pressed:

 : [key 8]
  : [key 9]
  : [key 10]
does I am going in right direction?

Regards,

Sudheer.