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Game Port programming

Posted on 2004-09-24
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Last Modified: 2006-11-17
Does anyone know where I can find some good example code for reading a joystick input through the PC game port?

I have a SideWinder 3D pro, I need to be able read the up/down and left/right movement as well as when the fire button is pressed.  I know how to access the game port using ioperm(), I just would like to look at some example's to get some ideas.

I am writing the application in C, then I will be writing a basic Qt GUI to display the results.
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Question by:sabrE7
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davidcausse earned 500 total points
ID: 12170076
Hi,

Joystick is a character device in Linux so you do not need to use complicated io* stuff. You can just access data sent by joystick by reading the character device /dev/js[0-9] or /dev/input/js[0-9] depends if you use devfs. You can make a simple test by doing "cat /dev/[input/]js0" and move your joystick.
[NOTE: reading a character device is like reading a regular file, except you cannot seek]

However it isn't a good idea to read directly through this device, you'd better implement a game library like SDL for convenient/portable access methods.

Have look here : http://www.libsdl.org/

Good luck.

PS. ioperm is very lowlevel syscall and needs the super-user permissions, I must recommend to not develop as super-user.
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by:Karl Heinz Kremer
ID: 12185701
Use libsdl, I fixed a few joystick problems in libsdl a few years ago, and I can tell you: You don't want to program the joystick directly :-) So take David's advice and learn about how to use libsdl.
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