Date: Fri, 05 Mar 2004 16:08:01 +0000

From: Alan Swanson Subject: Re: [SDL] Fatal signal when initiaize with USB joystick on 2.6.2 kern On Fri, 2004-03-05 at 15:09, Sam Lantinga wrote: > > Fred, how does the attached patch work for you? Do all your axes work? > > I think you meant the two lines to be reversed. > I checked a more robust version of this into CVS. Fred, can you see if > it works? You've misread the code. :-/ For coef[0] and coef[1], it is (values[2]+values[1]) / 2 and then add or subtract values[4] to the answer.
libsdl-org · Mar 6, 2004 · c85e4c9 · c85e4c9
1 parent a587875
commit c85e4c9
Showing 1 changed file with 6 additions and 8 deletions.
diff --git a/src/joystick/linux/SDL_sysjoystick.c b/src/joystick/linux/SDL_sysjoystick.c
@@ -436,17 +436,15 @@ static SDL_bool EV_ConfigJoystick(SDL_Joystick *joystick, int fd)
 				    joystick->hwdata->abs_correct[i].used = 0;
 				} else {
 				    joystick->hwdata->abs_correct[i].used = 1;
-				    t = (2 - values[4]);
-				    if ( t != 0 ) {
-				        joystick->hwdata->abs_correct[i].coef[0] = (values[2] + values[1]) / t;
-				    }
-				    t = (2 + values[4]);
-				    if ( t != 0 ) {
-				        joystick->hwdata->abs_correct[i].coef[1] = (values[2] + values[1]) / t;
-				    }
+				    joystick->hwdata->abs_correct[i].coef[0] =
+					(values[2] + values[1]) / 2 - values[4];
+				    joystick->hwdata->abs_correct[i].coef[1] =
+					(values[2] + values[1]) / 2 + values[4];
 				    t = ((values[2] - values[1]) / 2 - 2 * values[4]);
 				    if ( t != 0 ) {
 					joystick->hwdata->abs_correct[i].coef[2] = (1 << 29) / t;
+				    } else {
+					joystick->hwdata->abs_correct[i].coef[2] = 0;
 				    }
 				}
 				++joystick->naxes;