Mikroelektronika MIKROE-350 データシート

235

- SOFTWARE AND HARDWARE SOLUTIONS FOR EMBEDDED WORLD

CHAPTER 6

sub 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
dim keypadPort as byte at PORTB
dim keypadPort_Direction as byte at DDRB
...
Keypad_Init()

sub function Keypad_Key_Press() as byte

The code of a pressed key (1..16).

If no key is pressed, returns 0.

Reads the key from keypad when key gets pressed.

Port needs to be initialized for working with the Keypad library, see Keypad_Init.

dim kp as byte
...
kp = Keypad_Key_Press()

sub function Keypad_Key_Click() as byte

The code of a clicked key (1..16).

If no key is clicked, returns 0.

Call to Keypad_Key_Click is a blocking call: the function waits until some key is
pressed and released. When released, the function returns 1 to 16, depending
on the key. If more than one key is pressed simultaneously the function will wait
until all pressed keys are released. After that the function will return the code of
the first pressed key.

Port needs to be initialized for working with the Keypad library, see Keypad_Init.

dim kp as byte
...
kp = Keypad_Key_Click()