When you set pluto-servo.pwm.#.pwmdir TRUE, the output should be what you call "sign-magnitude": value after scale+offset PWM Dir 0.0 0% FALSE 0.5 50% FALSE 1.0 100%* FALSE -0.5 50% TRUE -1.0 100%* TRUE
* may be reduced by max-dc paramter In emc2 versions 2.2.0 through 2.2.3 there was a bug in the pluto drover's pwmdir mode that rendered it completely broken. It should be fixed in 2.2.4 and newer. When in the default mode (pwmdir FALSE), the output is: value after scale+offset Up Down 0.0 0% 0% 0.5 50% 0% 1.0 100%* 0% -0.5 0% 50% -1.0 0% 100%* * may be reduced by max-dc paramter There is no way to modify the PWM frequency of the pluto without recompiling the firmware. Using pdm mode (with or without pwmdir) is probably not appropriate because then the on- and off- times for pwm/up/down are very small, I think about 400ns. I intend to bring a pluto board along to fest, so if nothing else maybe I can try to toast one of Jon's amplifiers with it in an effort to sort this problem out :-P Jeff ------------------------------------------------------------------------- Check out the new SourceForge.net Marketplace. It's the best place to buy or sell services for just about anything Open Source. http://sourceforge.net/services/buy/index.php _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users