On Thu, 20 Mar 2008, sam sokolik wrote:
Date: Thu, 20 Mar 2008 09:21:56 -0500
From: sam sokolik <[EMAIL PROTECTED]>
Reply-To: "Enhanced Machine Controller (EMC)"
<[email protected]>
To: "Enhanced Machine Controller (EMC)" <[email protected]>
Subject: Re: [Emc-users] Mesa 7i43 PWM Output mode
I was actually planing on using a circuit like this
http://www.electronicsam.com/images/KandT/servostart/logic.JPG (just an
abstract idea - could be done with fewer ic's (nand))
when I get to that point. (unless the driver was changed before then)
sam
The current 5I20 firmware supported by EMC2 (HOSTMOT) does not support UP/DOWN
PWM mode.
If you patch the current firmware with the gates (ad directly drive an
HBridge) the will be some problems with glitches when the PWM is updated by
EMC, as the DIR output can be updated asynchronously relative to the PWM
output.
This is fixed in HOSTMOT2, both because UP/DOWN PWM mode is supported in the
hardware, and because HOSTMOT2 has a double buffered PWM mode that only
changes the outputs synchronously with the PWM cycle.
----- Original Message -----
From: "Sebastian Kuzminsky" <[EMAIL PROTECTED]>
To: "Enhanced Machine Controller (EMC)" <[email protected]>
Sent: Thursday, March 20, 2008 09:12 AM
Subject: Re: [Emc-users] Mesa 7i43 PWM Output mode
list wrote:
I’m new here and have question about PWM Up/down mode. From EMC docs and
wiki, Pluto-P can be configured for both step/dir or up/down output
mode. Can either MESA 5i20 or 7i43 output PWM up/down?
The 7i43 with the HostMot2 firmware can do PWM in up/down mode, but the
driver doesnt support it yet. I've been meaning to add that, I'll try
to get it done in the next day or so.
I'm not sure what the present capabilities of the 5i20 firmware & driver
are, but I would think they support up/down PWM. Over the next few
months or so I'm going to write a new driver for the 5i2x cards (and the
4i6x cards) for the HostMot2 firmware, and then they'll definately
support it.
--
Sebastian Kuzminsky
Yes, we have a soul. But it is mechanical. -- Daniel Dennet
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Peter Wallace
Mesa Electronics
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