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Interesting problem with RAMPS-FD and DRV8825

Posted by Ancharas 
Interesting problem with RAMPS-FD and DRV8825
May 12, 2017 10:20AM
The problem is simple: these drivers do not work) But everything is not so simple, as you can think.

I have a homemade CoreXY printer and Chinese RAMPS-FD. At start I tested my printer with A4988 drivers, and everything was good, but it was too noisy. I installed DRV8825, and, when I send move command, X motor moves slowly and Y motor gets in hold mode. I tuned current correctly (I checked!), I installed drivers correctly (I also checked!), but it doesn't work.
I swapped X and Y drivers, bit it doesn't work too. The interesting thing is, despite drivers' swapping, the motors' behaviour didn't change: X motor still move slowly, and Y motor still enter hold mode.
I have DRV8825 on Z axis, and it works good. But it don't work at X or Y axis.
After all tests I checked DRV8825 at another printer, and they work good there.
Now I continue using my printer with A4988 drivers.
My brain is blowing... What I do wrong?
Re: Interesting problem with RAMPS-FD and DRV8825
May 13, 2017 12:09AM
IIRC, there was a timing problem with 32bit RAMPS and DRV8825. The step pulses were too short for the DRV to register...
Re: Interesting problem with RAMPS-FD and DRV8825
May 13, 2017 02:01PM
Thanks for informaion! Is it possible to fix it? And how can I find any information about it?
Re: Interesting problem with RAMPS-FD and DRV8825
May 13, 2017 11:28PM
Thanks a lot, man, you saved me! Really, it works good after setting 1 ms STEPPER_HIGH_DELAY in my Repetier firmware.
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