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In this paper, the authors are developing device drivers for LCD display with touch screen and QWERTY keypad. LCD display is an electronic device, an array of pixels of color. It has resolution of 320x240. Touch screen is a 4-wire resistive circuit. When you press any key on the keypad the corresponding character is not simply added to the tty (controlling terminal). A lot of processing is required before the kernel knows what the correct characters are. Here, they are using QWERTY keypad similar to a computer keyboard with 50 keys.
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