Chief Delphi - Programming joysticks

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- Programming (http://www.chiefdelphi.com/forums/forumdisplay.php?f=51)

- - Programming joysticks (http://www.chiefdelphi.com/forums/showthread.php?t=24315)

NoRemorse

24-01-2004 17:17

Programming joysticks

On the new joysticks, there is a mini - milt-direction "d-pad" i guess you could call it. How do you prgram this, or can you even. I can't find it anywhere in the code

Dave Flowerday

24-01-2004 18:22

Re: Programming joysticks

Quote:

Originally Posted by NoRemorse

On the new joysticks, there is a mini - milt-direction "d-pad" i guess you could call it. How do you prgram this, or can you even. I can't find it anywhere in the code

It's called a "hat switch" and it'll show up as one of the analog joystick values to the robot controller. I can't remember if it appears as "Joystick Wheel" or "Joystick AUX" off the top of my head, though.

NoRemorse

24-01-2004 18:36

Re: Programming joysticks

well, the count of buttons on thejoistick does not equal the count of buttons in the program. and it is the odd man out.

FotoPlasma

24-01-2004 19:14

Re: Programming joysticks

The joystick's POV hat takes the place of the "pN_wheel", where N is the number of the joystick port you're using. I can only really speak for the joystick which I have right in front of me (the other is at my house, being used to play TIE Fighter :)), so YMMV. The two least significant bits of the value change too erratically to be of any use. Here's a listing of the values of the variable when the POV hat is in different positions:
Neutral: 001011xx
Up Left: 111111xx
Up: 111111xx
Up Right: 111111xx
Left: 011000xx
Right: 110010xx
Down Left: 101001xx
Down: 100101xx
Down Right: 110101xx

The x's take the place of the two least significant bits, which, as I said earlier, change randomly (at least with this single joystick).

Basically, if you can understand binary, you can take advantage of the POV hat for controlling your robot.

Hope this helps.

Smrtman5

27-01-2004 18:12

Re: Programming joysticks

I have two basic questions. First, can those old robot interfaces be programed for C or are they strictly the old stuff?

Second, does anyone have an old program with just the two joystick controls? All we want to do is hook up an old interface to a mock control board so we can make sure the trannys work.

(Note: Im the fabricator, the only thing i know about computers is how to break one)
Hopefully i can relay this answer to one of our more knowledgeable people. Thanks

Ryan M.

27-01-2004 20:31

Re: Programming joysticks

Quote:

Originally Posted by Smrtman5

I have two basic questions. First, can those old robot interfaces be programed for C or are they strictly the old stuff?

Do you mean the old robot controllers? If so, they can only do the old PBASIC stuff.

deltacoder1020

27-01-2004 21:21

Re: Programming joysticks

Quote:

Originally Posted by FotoPlasma

The joystick's POV hat takes the place of the "pN_wheel", where N is the number of the joystick port you're using. I can only really speak for the joystick which I have right in front of me
...
Neutral: 001011xx
Up Left: 111111xx
Up: 111111xx
Up Right: 111111xx
Left: 011000xx
Right: 110010xx
Down Left: 101001xx
Down: 100101xx
Down Right: 110101xx

our values for the joystick concur for the first 6 bits as well. (darn shame there is basically no difference between UL, U, and UR)

FotoPlasma

28-01-2004 05:51

Re: Programming joysticks

Quote:

Originally Posted by Smrtman5

Second, does anyone have an old program with just the two joystick controls? All we want to do is hook up an old interface to a mock control board so we can make sure the trannys work.

InnovationFirst has "Legacy Documentation" on their website. They have default code, written in PBASIC (for previous years' control systems), for both single and dual joystick driving. Here's a link to download those programs. They're listed under "PBASIC Code", but you will also need a copy of Parallax's computer program, in order to program your controller. Links are listed on that same website under "Programming Tools".

If you need any more assistance, feel free to ask.

Astronouth7303

28-01-2004 20:53

Re: Programming joysticks

So the bit masks are:

Code:

const unsigned char Hat_None = 0x2C;

const unsigned char Hat_Up = 0xFC;

const unsigned char Hat_Left = 0x60;

const unsigned char Hat_Right = 0xC0;

const unsigned char Hat_Down = 0x94;



//Unless values are off, Combos aren't OR'ed

const unsigned char Hat_Up_Left = 0xFC;

const unsigned char Hat_Up_Right = 0xFC;

const unsigned char Hat_Down_Left = 0xA4;

const unsigned char Hat_Down_Right = 0xD4;

This seems a little stupid, but that's life. :(

Chris Hleva

01-02-2004 23:59

Programming joysticks

I have a question, how could I add the right lines of code to make the POV hats work with the new C language this year? Amonst other things, where would I have to define them and map them to the right IO ports to work with the hex/bin input signal?

Ryan M.

02-02-2004 11:11

Re: Programming joysticks

Quote:

Originally Posted by FotoPlasma

Basically, if you can understand binary, you can take advantage of the POV hat for controlling your robot.

You also have to good at bit manipulation in C! :)

Joe Ross

02-02-2004 11:15

Re: Programming joysticks

Quote:

Originally Posted by Astronouth7303

So the bit masks are:

Code:

const unsigned char Hat_None = 0x2C;

const unsigned char Hat_Up = 0xFC;

const unsigned char Hat_Left = 0x60;

const unsigned char Hat_Right = 0xC0;

const unsigned char Hat_Down = 0x94;



//Unless values are off, Combos aren't OR'ed

const unsigned char Hat_Up_Left = 0xFC;

const unsigned char Hat_Up_Right = 0xFC;

const unsigned char Hat_Down_Left = 0xA4;

const unsigned char Hat_Down_Right = 0xD4;

Why not #define them, instead of taking up memory?

deltacoder1020

02-02-2004 12:45

Re: Programming joysticks

Quote:

Originally Posted by Chris Hleva

example:

Code:

if( (p1_wheel & 0xC0) == 0xC0 )

{

     //hat control is pushed right

}

else if( (p1_wheel & 0xA4) == 0xA4 )

{

     //hat control is pushed down-left

}

...

et cetera

...

just use the bitwise AND function (&) to determine if the correct bits are set.

Chris Hleva

02-02-2004 16:59

Re: Programming joysticks

Thanks, that helped a lot. I am just starting out with C so i'm still a little sketchy with it.

deltacoder1020

02-02-2004 17:21

Re: Programming joysticks

no prob. if you want a review on the syntax of C, you could try the various guides in the whitepapers section, or the guide that I'm working on (see the thread in this forum titled "FIRST Programming Tutorial")

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