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-   -   Mapping Buttons to PWMs (http://www.chiefdelphi.com/forums/showthread.php?t=25005)

actorindp 09-02-2004 22:05
Mapping Buttons to PWMs
 
Hey guys, how can i map a joystick button to say put pwm08 = 200

Thanks

-Nick
a.k.a
n00b under stress

Ryan Cumings 09-02-2004 22:08
Re: Mapping Buttons to PWMs
 
In a bit of pseudo code

Code:
if(p1_sw_trig) {
  // When we hold down the button do this
  pwm08 = 200;
}
else {
  // When we are not holding down the button, do this
  pwm08 = 127;
}

deltacoder1020 09-02-2004 22:09
Re: Mapping Buttons to PWMs
 
say you want the trigger to set pwm3 to 200 when pressed, 127 when not:

if(p1_sw_trig) pwm03 = 200;
else pwm03 = 127;

any of the button status variables will work in the if statement.

--edit--
lol, apparently ryan and I are both forum hawks ;)

actorindp 09-02-2004 22:25
Re: Mapping Buttons to PWMs
 
now where do i throw this code?

In default routine?

-Nivk

ShadowKnight 09-02-2004 23:03
Re: Mapping Buttons to PWMs
 
A good majority of the working modifications you make to the default code will go into user_routine.c, but you will want to throw your autonomous code into a specified area of user_routine_fast.c. There actually is a section of the user_routine.c file that is marked with comments indicating that that is where you need to include custom code. Hope that helps.

FotoPlasma 09-02-2004 23:05
Re: Mapping Buttons to PWMs
 
Another composition of this if-statement would be:
(p1_sw_trig)?pwm03 = 200:pwm03 = 127;

deltacoder1020 10-02-2004 00:17
Re: Mapping Buttons to PWMs
 
or even (if you want to be fancy)

pwm03 = p1_sw_trig ? 200 : 127;



as a general rule of thumb, if you're working from the default code without massive modifications, anything dealing with user control (such as button mapping) will go in Default_Routine().

Joe Ross 10-02-2004 09:06
Re: Mapping Buttons to PWMs
 
If you want to skip the if statement, you can use the following code

pwm03 = 127 + 63 * p1_sw_trig;

If you want your motor to be able to go backwards also, you can use 2 switches with the following code.

pwm03 = 127 + (63 * p1_sw_trig) - (63 * p1_sw_top);

deltacoder1020 10-02-2004 10:59
Re: Mapping Buttons to PWMs
 
Quote:
Originally Posted by Joe Ross
If you want to skip the if statement, you can use the following code

pwm03 = 127 + 63 * p1_sw_trig;

If you want your motor to be able to go backwards also, you can use 2 switches with the following code.

pwm03 = 127 + (63 * p1_sw_trig) - (63 * p1_sw_top);
just a cautionary real-world note, although this may work for the FRC, in actual C, the value of "true" for booleans is not always 1 - in fact, it's often -1. :)

but yes, for the FRC, one could use Joe's code.

mtrawls 10-02-2004 11:11
Re: Mapping Buttons to PWMs
 
Quote:
Originally Posted by deltacoder1020
just a cautionary real-world note, although this may work for the FRC, in actual C, the value of "true" for booleans is not always 1 - in fact, it's often -1. :)

but yes, for the FRC, one could use Joe's code.
Well, to be accurate, the value of true is not-false, that is, anything but 0. But p1_sw_trig is a bit, representing 1 for on, and 0 for off, so it'll be okay.

Oh, and yall don't know how lucky you have it (well, most of you do). Back in my day, we didn't have your stinkin' order of operations, and had to cram our code full of paretheses. (Or, more accurately, casually forget to do so and hit yourself when you see robot go crazy.) Yet another benefit of C over PBASIC. I, for one, am breathing a sight of relief.


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