User manual

427

mikoPascal PRO for dsPIC30/33 and PIC24

MikroElektronika

PS/2 Library

The mikroPascal PRO for dsPIC30/33 and PIC24 provides a library for communication with the common PS/2

keyboard.

Important:

- The library does not utilize interrupts for data retrieval, and requires the oscillator clock to be at least 6MHz.

- The pins to which a PS/2 keyboard is attached should be connected to the pull-up resistors.

- Although PS/2 is a two-way communication bus, this library does not provide MCU-to-keyboard communication; e.g.

pressing the Caps Lock key will not turn on the Caps Lock LED.

The following variables must be dened

in all projects using PS/2 Library:

Description: Example:

var PS2_Data : sbit; sfr;

external;

PS/2 Data line.

var PS2_Data : sbit at RB0_bit;

var PS2_Clock : sbit; sfr;

external;

PS/2 Clock line.

var PS2_Clock : sbit at RB1_bit;

var PS2_Data_Direction : sbit;

sfr; external;

Direction of the PS/2 Data pin.

var PS2_Data_Direction : sbit at

TRISB0_bit;

var PS2_Clock_Direction : sbit;

sfr; external;

Direction of the PS/2 Clock pin.

var PS2_Clock_Direction : sbit at

TRISB1_bit;

External dependencies of PS/2 Library

Library Routines

- Ps2_Cong

- Ps2_Key_Read