This program uses both the KBD.C and LCD.C drivers to allow
keypad entry and LCD display. All keys are echoed except
that will clear the display. Either the kbd_getc or lcd_putc
may be replaced with getc or putc to use just one device with
The following code,
demonstrate how to implement key pressed on the 4 x 3 keypad to be display on the 16 x 1 LCD
Module and echoed on the RS-232 channel.