GCBASIC documentation
Keypad

Syntax:

    var = KeypadData

Command Availability:

Available on all microcontrollers.

Explanation:

This function returns a value corresponding to the key that is pressed on the keypad. Note that if two or more keys are pressed at once, only one value is returned. var can have one of the following values:

Example:

    'Program to show the value of the last pressed key on the LCD
    #chip 18F4550, 20

    'LCD connection settings
    #define LCD_IO 4
    #define LCD_WIDTH 20                ;specified lcd width for clarity only.  20 is the default width
    #define LCD_DB4 PORTD.4
    #define LCD_DB5 PORTD.5
    #define LCD_DB6 PORTD.6
    #define LCD_DB7 PORTD.7
    #define LCD_RS PORTD.0
    #define LCD_RW PORTD.1
    #define LCD_Enable PORTD.2

    'Keypad connection settings
    #define KeypadPort PORTB

    'Main loop
    Do
        'Get key
        Temp = KeypadData          ' <<< the KeypadData instruction

        'If a key is pressed, then display it
        If Temp <> KEY_NONE Then
            CLS
            Print Temp
            Wait 100 ms
        End If
    Loop

Key line: Temp = KeypadData — reads the currently pressed key as a single decoded value (0-15, or KEY_NONE if nothing is pressed), rather than the raw per-key bitmask that KeypadRaw returns.

See Also: