Mikroelektronika MIKROE-742 데이터 시트

The mikroPascal PRO for AVR provides a library for working with 4x4 keypad. The library routines
can also be used with 4x1, 4x2, or 4x3 keypad. For connections explanation see schematic at the
bottom of this page.

Note: Since sampling lines for AVR MCUs are activated by logical zero Keypad Library can not
be used with hardwares that have protective diodes connected with anode to MCU side, such as
mikroElektronika's Keypad extra board HW.Rev v1.20

- Keypad_Init 
- Keypad_Key_Press 
- Keypad_Key_Click 

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- SOFTWARE AND HARDWARE SOLUTIONS FOR EMBEDDED WORLD

CHAPTER 6

var keypadPort :
byte; 

sfr; external;

Keypad Port.

var keypadPort : byte
at PORTB;

var
keypadPort_Direction :

byte; 

Direction of the Keypad
Port.

var
keypadPort_Direction

: byte 

at DDRB;

procedure Keypad_Init();

Nothing.

Initializes port for working with keypad.

Global variables : 

- 

keypadPort_Reg

- Keypad port 

- 

keypadPort_Reg_Direction

- Direction of the Keypad port 

must be defined before using this function.

// Initialize PORTB for communication with keypad
var keypadPort : byte at PORTB;
var keypadPort_Direction : byte at DDRB;
...

Keypad_Init();