Mikroelektronika MIKROE-442 데이터 시트

mikroBasic PRO for dsPIC30/33 and PIC24

MikroElektronika

429

Ps2_Config

Ps2_Key_Read

sub procedure Ps2_Config()

Description Initializes the MCU for work with the PS/2 keyboard.
Parameters None.
Returns

Nothing.

Global variables: 

- 

PS2_Data

: Data signal line 

- 

PS2_Clock

: Clock signal line 

- 

PS2_Data_Direction

: Direction of the Data pin 

- 

PS2_Clock_Direction

: Direction of the Clock pin 

must be defined before using this function.

                                                       

dim PS2_Data as sbit at RB0_bit           

dim PS2_Clock as sbit at RB1_bit     

dim PS2_Data_Direction as sbit at TRISB0_bit

dim PS2_Clock_Direction as sbit at TRISB1_bit

...

Ps2_Config()         ‘ Init PS/2 Keyboard

None.

sub  function  Ps2_Key_Read(dim  byref  value  as  byte,  dim  byref  special  as 

byte, dim byref pressed as byte) as word

Description The function retrieves information on key pressed.
Parameters - 

value

: holds the value of the key pressed. For characters, numerals, punctuation marks, and space 

value

 will store the appropriate ASCII code. Routine “recognizes” the function of Shift and Caps Lock, 

and behaves appropriately. For special function keys see Special Function Keys Table. 

- 

special

: is a flag for special function keys (F1, Enter, Esc, etc). If key pressed is one of these, 

special

 will be set to 1, otherwise 0.

- 

pressed

: is set to 1 if the key is pressed, and 0 if it is released. 

- 

1

 if reading of a key from the keyboard was successful 

- 

0

 if no key was pressed 

PS/2 keyboard needs to be initialized. See Ps2_Config routine.

dim value, special, pressed as word

...

do {

  if (Ps2_Key_Read(value, special, pressed)) then 

    if ((value = 13) and (special = 1)) then 

      break

  end if 

  

loop until (0=1)

None.