Hello!

So I'm trying to make a basic mouse driver for protected mode.I've went to
os dev wiki , some other sites , I've searched through this forum ( I read some topics more than 4 time ) , looked trough the MenuetOS an KolibriOS source codes , and I couldn't come up with a mouse drives , I simply don't understand how to make one.

I found on os dev forums a mouse driver written in C , when I see C or C++ source codes I puke instantly.

I'm familiar with using IN and OUT functions from a basic keyboard driver(
code found around here ).

I know that I have to enable somehow the mouse by sending something to the keyboard controller , wait for something to come back , after that everything becomes fuzzy , and in the end I should have 3 bytes for buttons, X and Y.

Can someone please show me a simple example of a mouse drive in assembly, and also if it comes with a little explanation that that would be even better , but any feedback it's appreciated.

And another thing, in which registers the 3 bytes are stored?

Thank you!

This Fasm Browser written by Dex4u :
it is not complete but does have mouse Functions you could learn from..
also many other PM Functions..

http://dex4u.com/FAB/

Download the FABsource.zip look under Functions - MouseDraw ,MouseData, and the MouseLib

Its not well documented but if you have questions about any code I am sure there is someone here that could help!

Thank you for the fast reply! Now I'm looking through the source code...

Dex4u had also done a simple version for MiniDOS.
This was the latest link i had, IDK if it work4u?
http://www.dex4u.com/tuts/MouseDemo.zip

I looked at both examples and compared them with MenuetOS and KolibriOS mouse drivers and from what I understand , in order to use the mouse I need a Setup section of code , a section of reading the data that comes from the mouse after it's initialized , and a section to display the cursor.

The fist section is something like:

Mouse Set Up: ... RET
Keyboard Read: ... RET
Keyboard Write: ... RET
Keyboard Command: ... RET

... and I kind of understood that.

I can manage the third section.
Now the second section of code is the problem.

- After I call the "Mouse Set Up:" part what do I need to do to receive the 3 bytes from the mouse?
- Do I really need an IDT for this and why?
- Why the keyboard must be disabled when I read the output from the mouse?

PS:I just want to get the mouse working for now , I'll have time to study all the aspects of it later.

Thanks again!

you need to preocess the mouse interrput.
i don't know if it is the same as keyboard.

each int, you receive a new byte.
you find the first one who have a bit always set to indicate it is the first.

See here:

http://www.computer-engineering.org/ps2mouse/

under Command Set:
E9h

This article explains the mouse..




I dont think you do.. you can enable the mouse.. but to get it to move you would need a loop to track the movement... and update the screen pos..
for testing..

but for an OS you would want to program an IDT

I just found this.. I have not tested it.. but its a simple mouse program..
with out using IDT.... loops like I was talking about above.. looks like what you were looking for:

http://www.programmersheaven.com/download/36764/download.aspx


its realmode example but should work for pm..

wow! how did you found this , I thought i searched the whole Internet.
It's exactly what I was looking for. I tested it in p mode ( with some adjustments )and it works. Thanks!