Keypad handler

Today I finished writing the PIC code in 'C' language for handling the operation of a typical matrix keypad, as mentioned in the previous posting. Characters 0-9, *, # can be keyed-in and displayed one at a time.
The purpose of this activity is to pave the way towards my ultimate goal which is to enter frequency tuning data via a keypad instead of a rotary encoder, in an alternative version of the embedded control frequency synthesiser. At this later stage, the * and # buttons will be assigned to 'clear/backspace' and 'enter'.
For now, however, further development has to be put on-hold.