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Date: Sun, 28 Jun 2015 20:09:59 +0200
From: Bernd Walter <ticso AT cicely7 DOT cicely DOT de>
To: "Rob Butts (r DOT butts2 AT gmail DOT com)" <geda-user AT delorie DOT com>
Subject: Re: [geda-user] Stepper driver issues
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On Sun, Jun 28, 2015 at 01:33:45PM -0400, Rob Butts (r DOT butts2 AT gmail DOT com) wrote:
> I will check the driver voltage supply since in this bread board setup it
> is the most suspect.???

Bread board is very likely an issue.
The output drivers switch high current low-side and high-side.
If ground supply of the driver module shifts relative to your microcontroller
then it can easily detect wrong signals.
It can also have problems on the power output, because of undervoltage
spikes triggering temporary driver shutdown, etc..

-- 
B.Walter <bernd AT bwct DOT de> http://www.bwct.de
Modbus/TCP Ethernet I/O Baugruppen, ARM basierte FreeBSD Rechner uvm.