====== Keypad ======

''variable = Keypad( portBlock)''
| //variable// | Variable to store results (Returns Byte, No String or Single)  |
| //portBlock// | Port block (0 to 15)  | 

Use this command to read input from a matrix keypad. One port block can
be used to read a 4 by 4 keypad input. The keypad rows should be
connected to the lower 4 bits of the Port Block, and the keypad columns
should be connected to upper 4 bits of the port block.

Pullup resistors (2.2K to 10K) should be connected to the lower 4 bits of the
port block. A resistor should be connected even if a row is not being used.
Please refer to the diagram below:

{{ :cubloc:keypad:keypad.png?nolink |}}

<code xbasic>
A = Keypad(0) ' Read the status of keypad connected to Port Block 0

</code>

If no keys are pressed, 255 will be returned. Otherwise, the pressed key’s
scan code will be returned.

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