On Tue, 1 May 2007, Seb James wrote:
> Date: Tue, 01 May 2007 14:26:35 +0100
> From: Seb James <[EMAIL PROTECTED]>
> Reply-To: "Enhanced Machine Controller (EMC)"
> <emc-users@lists.sourceforge.net>
> To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net>
> Subject: Re: [Emc-users] Newest 5i20 FPGA code
>
> On Tue, 2007-05-01 at 08:56 -0400, John Kasunich wrote:
>> Seb James wrote:
>>> Hi List,
>>>
>>> This message is about the latest 5i20 FPGA code which John Kasunich said
>>> he was working on in February this year (around then anyhow).
>>>
>>> The feature in this new code which I need is the ability to configure
>>> the 5i20 with between 0 and 8 axes of (pwm)servo outputs and encoder
>>> inputs with the rest of the 5i20 I/O being used as simple logic inputs
>>> and outputs.
>>>
>>> In my case, the servo/encoder i/o will be routed through a Mesa 7i33
>>> board for signal conditioning.
>>>
>>> Has this new code made its way into a release yet? I'm going to check
>>> out the CVS EMC2 version and have a look in there right now. None of the
>>> changelogs say anything about this code in a release, so I guess it
>>> hasn't been released yet.
>>>
>>> I'm going to try to make use of the code, so I may have some questions
>>> for the list!
>>
>> My stuff isn't there yet. I have been getting bogged down in a bunch
>> of "infrastructure" issues having to do with managing various FPGA
>> configurations. In addition, my first target is step generators.
>>
>> However, I believe the existing "hostmot5-8" configuration will meet
>> your needs. For some notes, see:
>> http://cvs.linuxcnc.org/cgi-bin/cvsweb.cgi/emc2/src/hal/drivers/m5i20/README.txt?rev=1.3
>>
>> That config is not part of the version 2.1.4 release - you'll need to
>> get a CVS checkout to use it. It will be in 2.2.0 however.
>>
>
> I've been having a look at the emc2-trunk source tree. Is your new stuff
> going in emc2-trunk/src/hal/drivers/mesa_5i2x?
>
> I think the hostmot5-8 configuration will be close to what I require for
> one of my boards (we're doing a simple 2 axis machine with one 5i20 then
> we'll move on to the 9 axis machine which requires 4 5i20 boards). Does
> the hostmot5-8 configuration bind 5i20 pins to particular servo/encoder
> functions? By that I means would hostmot5-8 fix, say, pin 25 to be a
> servo pwm direction output?
>
> Initially I need a configuration which has exactly two servo/encoder
> axes (12 pins in all), 31 logic inputs and 29 logic outputs.
>
> I think I need to write a new VHDL configuration for this setup. Would
> you agree?
>
> Seb
>
>
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If someone would write a updated driver, I have a 12 axis servo configuration
with servo outputs overlaid on I/O (so if they are not enabled you have 72 bit
of I/O). This is not a fancy as John K's, but the pinout definition is just a
little section that wires the servo pins to I/O pins so the pinout is easy to
change plus, if you can live with the existing pinout, it can easily be
programmed to do what you want by just enabling 2 servo axis (leaving 60 pins
as I/O)
Also we are coming out with a USB/SPI I/O expander with 24 isolated inputs and
24 isolated outputs. This can use 6 pins on a 50 pin interface connector, (SPI
mode) allowing 4 expanders to share a 50 pin cable. If you are using isolated
I/O this could save a lot of 5I20 I/O pins.
Peter Wallace
Mesa Electronics
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