PS/2 Keyboard library for Arduino

That library implements the PS/2 protocol for keyboards. You can then interface with an old PS/2 keyboard, or emulate key events to a computer with a PS/2 port.

Setup Instructions

Copy the folder FidPS2 in your arduino libraries folder.

Then, include the header files in your project source file:

#include <FidPS2Keyboard.h>
#include <FidPS2Host.h>

Interfacing a keyboard

First, you have to init the library by calling the function

void fid_ps2kb_init(int data, int clock)

where data is the Arduino pin number attached to the data pin of the keyboard, and clock is the arduino pin attached to the clock pin.

Then you can listen for incoming keys by using

bool fid_ps2kb_read(uint8_t* b)

This function returns true if there is a byte in the buffer and writes its value in the variable pointed by b. The next call would write the next bytes and so on, until it returns false indicating that the buffer is empty.

And you can send bytes to the keyboard for commands (like changing LEDS for numlock or capslock states) with this function:

void fid_ps2kb_write(uint8_t b)

Emulating a keyboard

The API is very close to the one for interfacing to a keyboard.

The initialization function is the following:

void fid_ps2h_init(int data, int clock);

You can send bytes to the computer with this function:

void fid_ps2h_write(uint8_t b)

And get the response back, or incoming commands with:

bool fid_ps2h_read(uint8_t* b)

It returns true as long as there is still bytes in the buffer, and write their values to the variable pointed by b.