Can't get DoubleStep to work ? SOLVED

So, I've tried to increase reset-time from 5000 to 10000 then 15000 : no luck.

For a commanded move of 2500 mm, with a SCALE of 100, the driver gets 249,541 (249,386 at 10000 reset-time) pulses, for 250,000 expected. The return move to 0 ends up at 144 PUU from original 0 position.

The BASE_PERIOD is currently set at 25000, so I guess that going much higher for the reset-time does not make much sense.

I guess the only way to see if the BOB is the problem would be to bypass it and connect directly from the parallel port to the drives, but I don't feel comfortable doing this. I'd hate to fry one of these drives...

Do you loose steps depending from speed.
Have you tried a pause before you reversed

I don't think that this is a matter of speed : when I deactivate DoubleStep, all things being equal, I get the expected results, i.e the correct number of pulses recied by the servos and a return to exact 0 position

Which breakout board are you using?

something like this one :

That type of break out should be fine (the ones with issues have isolated step/dir signals, that one just buffers the signals)

Revisiting your hal file, I think I see the issue, you are resetting the direction pins, you should _not_ do this!
You should only reset the "step" pins.

Sorry for the late reply, I only have a mobile-supported network connection at the shop, and my mobile ran out.

>you are resetting the direction pins, you should _not_ do this !
OK, so I'll try again tomorrow with only resetting the steps.
When I added this feature, I pondered for a while if I should reset only the steps or both the steps and dirs, and decided it'd be more logical to treat both signals the same way. My logic was wrong. Can you explain a bit ?

On another note, I was so happy to see my machine working again as expected, if only with a little lower max speed, that I got carried away and managed to break my first little mill bit. I guess it won't be the last one.

Thanks again for your very helpful replies !

> Resetting the DIR pins means that in one direction you are setting DIR and STEP to ON at exactly the same time. Sometimes this might give a step in the wrong direction.

OK, I'm trying to understand this... I had assumed that once the pins are reset, the Dir pin would be set again to 1 if needed at the same time than a new step would be pulsed. The problems would come from the fact that the Dir signal must be set (if needed) _before_ a Step is issued, which does not happen with my settings ?