From: Clemens Koller <clemens.koller@anagramm•de>
To: Bai Shuwei <baishuwei@gmail•com>
Cc: linuxppc-dev@ozlabs•org, shekr06@lzu•cn, puyq@lzu•cn,
zhang_wei@lzu•cn, linuxppc-embedded@ozlabs•org
Subject: Re: PCI to Parallel for PowerPC
Date: Sun, 25 Nov 2007 18:00:11 +0100 [thread overview]
Message-ID: <4749AA1B.3050805@anagramm.de> (raw)
In-Reply-To: <f3566d60711242106x4d56efe1w325e70c522ddd62c@mail.gmail.com>
Bai Shuwei schrieb:
Please don't cross-post.
> hi, all
> I bought a SMC1500 stepper motor card. And it can connect with host
> through parallel port. My target board is PowerPC 440, which hasn't
> parrallel port. So I bought a PCI to Parallel line for SMC1500. But when
> I run the stepper motor, I find it's not stable. I doubt there are
> somthing wrong with my PCI to Parallel line. So I beg somebody can tell
> me where I can bought the appropriate conversion line from PCI to
> parallel, and does somebody give me some idea about how to control my
> stepper motor through PowerPC 440? thx all
Put that PCI Card to your host where your stepper was working
properly to see if it's a hardware issue with that card.
Then it depends on how you control your stepper motor. If you use
some bit-banging (which I wouldn't recommend) to drive each winding
and want to have smooth movement, you need a very precise timing
when it comes to some "more than low-speed" stepper motors,
otherwise your motors will start to coggle.
To be precise: you will first have to figure out what leads to
the effect of "it's not stable". Do you have an Oscilloscope?
Regards,
--
Clemens Koller
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next prev parent reply other threads:[~2007-11-25 17:05 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-11-25 5:06 PCI to Parallel for PowerPC Bai Shuwei
2007-11-25 17:00 ` Clemens Koller [this message]
2007-11-25 21:09 ` Benjamin Herrenschmidt
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