[Emc-users] hal modules - i2c, 1wire, uart...

[Klemen Dovrtel]

Would it be possible to make/compile hal modules for standard communication 
protocols like i2c, 1wire, uart,... For instance, I would like to connect a 
1wire temperature sensor directly to parallel port for monitoring/control the 
temperature of machine/process. Has anybody tried this?
Regards
Klemen


  

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Re: [Emc-users] Estop Setup

[acemi list]

Hi Dustin,

In your HAL file, you need to delete the following lines:
net estop-out <= iocontrol.0.user-enable-out
net estop-out => iocontrol.0.emc-enable-in

And add the followings (this is for estop linked to the parport pin 13):
net estop <= parport.0.pin-13-in
net estop => iocontrol.0.emc-enable-in


acemi

On 2/16/10, Dustin Monroe  wrote:
> Hello,
>
> I am having issues setting up my physical estop. In the IO file when I
> block out the computer estop and enable the physical estop I get an
> error that the estop has already been assigned. I looked through all of
> the files and see no other reference to the estop.
>
> Any help would be great. Thanks
>
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Re: [Emc-users] Feed override by external input device?

[rng3]

Hello,

In answer to the original question we are using a simple usb joypad for 
jogging.

You can add other features to the extra buttons. These buttons can be 
combined with the halui feed-override-decrease and halui 
feed-override-increase pins.

There is great information on the joypad available on the WIKI now, more 
information on this and other new features that can be added to joypad 
should be available on the WIKI soon.

And this is a simple, inexpensive usb device that does not tie up any 
parallel port pins.

Rick


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Re: [Emc-users] hal modules - i2c, 1wire, uart...

[Jeff Epler]

On Tue, Feb 16, 2010 at 12:55:00AM -0800, Klemen Dovrtel wrote:
> Would it be possible to make/compile hal modules for standard
> communication protocols like i2c, 1wire, uart,... For instance, I
> would like to connect a 1wire temperature sensor directly to parallel
> port for monitoring/control the temperature of machine/process. Has
> anybody tried this?

It depends whether the protocol will work within the constraints of HAL.
Here, the timing constraints are probably most relevant: each
base-period you can sample an input once and change an output once.
Each period is displaced from its ideal time by up jitter, which in many
cases is nearly half as long as the period.

So bit-banging rs232-style serial is not likely to work well, unless the
rate is much less than 1 bit per base-period.

i2c master, spi master are going to work much better, since you'll
generate the clock at the same times you generate and read the signal.
Top rate: 1 bit per 2 base-periods.

1wire is nice and slow, so you should typically have enough base-periods
available to determine what bit is being transmitted by the slave.  Top
rate: determined by 1wire

In the case of i2c and 1wire you'll have to deal with the requirement
for open collector lines.  You can do this using one I and one O pin and
some external circuitry, of course.   Some parports have the ability to
treat the the "control port" pins (1, 14, 16, 17) as OC, but we removed
this capability from our own parport driver because it was a frequent
cause of misconfiguration.  In case you want to go looking in our
project's history, this capability was removed in commit 66639eacc4
(unfortunately, the hal_parport driver has changed enough in the
meantime that the commit can't just be reverted)

If you do write any of these hal components, please consider sharing
them with the community.  We have a wiki page for this purpose:
http://wiki.linuxcnc.org/emcinfo.pl?ContributedComponents
to edit the wiki, you first have to log in with a specific password
(this is to stop, or at least slow down, wiki spammers):
http://wiki.linuxcnc.org/emcinfo.pl?BasicSteps

Jeff

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Re: [Emc-users] Estop Setup

[John Thornton]

In the Stepconf Wizard you can just select E Stop from the drop down 
list for input pin and the connections are made for you.

On 2/16/2010 4:19 AM, acemi list wrote:
> Hi Dustin,
>
> In your HAL file, you need to delete the following lines:
> net estop-out<= iocontrol.0.user-enable-out
> net estop-out =>  iocontrol.0.emc-enable-in
>
> And add the followings (this is for estop linked to the parport pin 13):
> net estop<= parport.0.pin-13-in
> net estop =>  iocontrol.0.emc-enable-in
>
>
> acemi
>
> On 2/16/10, Dustin Monroe  wrote:
>
>> Hello,
>>
>> I am having issues setting up my physical estop. In the IO file when I
>> block out the computer estop and enable the physical estop I get an
>> error that the estop has already been assigned. I looked through all of
>> the files and see no other reference to the estop.
>>
>> Any help would be great. Thanks
>>
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>>
>>  
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Re: [Emc-users] hal modules - i2c, 1wire, uart...

[Kirk Wallace]

On Tue, 2010-02-16 at 00:55 -0800, Klemen Dovrtel wrote:
> Would it be possible to make/compile hal modules for standard communication 
> protocols like i2c, 1wire, uart,... For instance, I would like to connect a 
> 1wire temperature sensor directly to parallel port for monitoring/control the 
> temperature of machine/process. Has anybody tried this?
> Regards
> Klemen

I did this with SPI which should be similar:
http://www.wallacecompany.com/machine_shop/EMC2/serial_dac/ 
http://www.wallacecompany.com/machine_shop/EMC2/serial_adc/ 

I believe Peter has SPI support on some of his Mesa cards, but I don't
know if EMC2 supports this feature:
http://mesanet.com/ 

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California, USA


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Re: [Emc-users] hal modules - i2c, 1wire, uart...

[Jon Elson]

Jeff Epler wrote:
> On Tue, Feb 16, 2010 at 12:55:00AM -0800, Klemen Dovrtel wrote:
>   
>> Would it be possible to make/compile hal modules for standard
>> communication protocols like i2c, 1wire, uart,... For instance, I
>> would like to connect a 1wire temperature sensor directly to parallel
>> port for monitoring/control the temperature of machine/process. Has
>> anybody tried this?
>> 
>
> It depends whether the protocol will work within the constraints of HAL.
> Here, the timing constraints are probably most relevant: each
> base-period you can sample an input once and change an output once.
> Each period is displaced from its ideal time by up jitter, which in many
> cases is nearly half as long as the period.
>
>   
If he is just interested in machine temperature, then it might work to 
do this one bit
per servo cycle thing.  But, I am guessing a one-wire temp sensor has a 
maximum clock
period, as it has to run off internal capacitors when sending the temp 
data back.  (There are other
serial protocols that have a separate power pin, so this may not 
apply.)  Some of
these devices send relatively few bits of data and can do so as fast as 
a parallel port can
go.  So, I think a short routine that just runs for 30-50 us bit-banging 
the port pin could
do it.  HOWEVER, the Maxim part I think you have in mind is not like 
that, and it runs
about 50 us per bit.  And, it needs its parallel port bit to reverse 
direction once for
every bit sent.  The only parallel ports that can reverse direction are 
the 8 data lines,
and they are all write, or all read.  The Maxim DS18S20 has a "time 
slot" of 60 -120 us,
per bit, so it can't be read at one bit per servo cycle.  Maybe you 
could set up the
BASE_THREAD time to satisfy this, but it sounds like a VERY wrong way to go.
Yes, you might be able to make it work, but you'd be compromising so 
MUCH stuff
in EMC just to get this one sensor working.

Jon

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Re: [Emc-users] hal modules - i2c, 1wire, uart...

[Jeff Epler]

On Tue, Feb 16, 2010 at 11:35:59AM -0600, Jon Elson wrote:
> HOWEVER, the Maxim part I think you have in mind is not like that, and
> it runs about 50 us per bit.

Ah, I stand corrected.  My recollection was that the bit time of onewire
was more in the realm of 1ms than tens of us.

Jeff

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Re: [Emc-users] hal modules - i2c, 1wire, uart...

[Sebastian Kuzminsky]

Jeff Epler wrote:
> On Tue, Feb 16, 2010 at 11:35:59AM -0600, Jon Elson wrote:
>> HOWEVER, the Maxim part I think you have in mind is not like that, and
>> it runs about 50 us per bit.
> 
> Ah, I stand corrected.  My recollection was that the bit time of onewire
> was more in the realm of 1ms than tens of us.

There are two speeds defined by the One-wire spec:

> Most 1-Wire devices support two data rates: Standard speed of about 15kbps 
> and Overdrive speed of about 111kbps

(from )

I think all 1-wire devices must support the normal speed (67 us/bit), 
and you can probe the device to see if it supports overdrive (9 us/bit).


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[Emc-users] hostmot2 PWM

[claude]

Hi all,

First, I take this opportunity to say a big THANKS to every one for this 
wonderful piece of software. I use it for machining and also some 
automatic machine with great reliability and flexibility.


I may use for a future project some MESA card with hostmot2 "firmware". 
After reading a bit how to set PWM, I don't get the complete picture, 
what is PDM PWM ? what is the difference between this and "regular" PWM 
? is there somewhere drawing on how it work (I look a bit on VHDL code, 
but it pretty difficult to get the exact way of work).

As a second point, I may do some change to the PWM VDHL code. I didn't 
find any explanation on how to compile FPGA (I have knowledge on FPGA 
and VHDL language, unfortunately only on Altera one). As much as I 
imagine, there should be some free way to do compilation and test, but 
this doesn't seems to be integrated with EMC distribution, can someone 
give me some hint ??

regards

Claude




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Re: [Emc-users] hal modules - i2c, 1wire, uart...

[John Pfleger]

My solution to this problem is to use an external micro to do the
temperature monitoring and talk back to HAL via rs-232. This is all based
upon http://axis.unpy.net/01198594294
I am actually using an MSP430 rather than a Adruino board, but the principle
is the same. No reason why you could not use a PIC either.

Limitation is it is not real time, but for monitoring temperature, not an
issue.
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Re: [Emc-users] hostmot2 PWM

[Peter C. Wallace]

On Tue, 16 Feb 2010, claude wrote:

> Date: Tue, 16 Feb 2010 21:13:26 +0100
> From: claude 
> Reply-To: "Enhanced Machine Controller (EMC)"
> 
> To: emc-users@lists.sourceforge.net
> Subject: [Emc-users] hostmot2 PWM
> 
> Hi all,
>
> First, I take this opportunity to say a big THANKS to every one for this
> wonderful piece of software. I use it for machining and also some
> automatic machine with great reliability and flexibility.
>
>
> I may use for a future project some MESA card with hostmot2 "firmware".
> After reading a bit how to set PWM, I don't get the complete picture,
> what is PDM PWM ? what is the difference between this and "regular" PWM
> ? is there somewhere drawing on how it work (I look a bit on VHDL code,
> but it pretty difficult to get the exact way of work).

PWM and PDM are similar in that they both let you set the duty-cycle of 
a digital signal (the 'on' time versus total cycle time) But they differ in 
their actual generated waveforms.

For example a 12 bit PWM signal with 50% duty cycle would be on for 
2048 clocks and off for 2048 clocks. If the PWM clock was 100 MHz, this would 
give a ~24.4 KHz square wave.

A 12 bit PDM signal with 50% duty cycle would alternate on-off at each 
clock. With a 100 MHz clock this would result in a 50 MHz square wave. Both 
modes let you set the duty cycle but the output waveforms are different.

PWM is suitable for driving HBridges, but is harder to filter than PDM 
if analog output is desired.

>
> As a second point, I may do some change to the PWM VDHL code. I didn't
> find any explanation on how to compile FPGA (I have knowledge on FPGA
> and VHDL language, unfortunately only on Altera one). As much as I
> imagine, there should be some free way to do compilation and test, but
> this doesn't seems to be integrated with EMC distribution, can someone
> give me some hint ??

There are free (as in beer) tools for compilation available from Xilinx:
Xilinx WebPack

>
> regards
>
> Claude
>
>
>
>

Peter Wallace
Mesa Electronics

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(")_(") signature to help him gain world domination.


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Re: [Emc-users] hostmot2 PWM

[seb]

PWM is "pulse width modulation".  PDM is "pulse density modulation".  

In PWM you have a carrier frequency, a duty cycle, and a resolution.  The duty 
cycle specifies what fraction of the cycle should be high, or active.  The 
resolution determines how accurately the requested duty cycle can be 
implementes in the pwm output signal.  For example, if the PWM signal ha sonly 
2 bits of resolution, your effective duty cycle can only take the values 0%, 
25%, 50%, or 75%.

In PDM you have a "time-slot duration" (or time-slot frequency) and a duty 
cycle.  You do not have a carrier wave (like you do with PWM).  Instead each 
little "time slot" in the output signal is independently set high or low, and 
they average to the requested duty cycle. 


Regarding your second question, the hm2 firmwares are compiled with the 
free-as-in-beer VHDL tools from Xilinx.  Jeff Epler recently did some work to 
automate this process, but I don't know much about it.


-- 
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just let your nerdy flourish

-Original Message-

From:  claude 
Subj:  [Emc-users] hostmot2 PWM
Date:  Tue 2010 Feb 16 13:13
Size:  1K
To:  emc-users@lists.sourceforge.net

Hi all,

First, I take this opportunity to say a big THANKS to every one for this 
wonderful piece of software. I use it for machining and also some 
automatic machine with great reliability and flexibility.


I may use for a future project some MESA card with hostmot2 "firmware". 
After reading a bit how to set PWM, I don't get the complete picture, 
what is PDM PWM ? what is the difference between this and "regular" PWM 
? is there somewhere drawing on how it work (I look a bit on VHDL code, 
but it pretty difficult to get the exact way of work).

As a second point, I may do some change to the PWM VDHL code. I didn't 
find any explanation on how to compile FPGA (I have knowledge on FPGA 
and VHDL language, unfortunately only on Altera one). As much as I 
imagine, there should be some free way to do compilation and test, but 
this doesn't seems to be integrated with EMC distribution, can someone 
give me some hint ??

regards

Claude




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Re: [Emc-users] hostmot2 PWM

[Kirk Wallace]

On Tue, 2010-02-16 at 21:13 +0100, claude wrote:
... snip
> I may use for a future project some MESA card with hostmot2 "firmware". 
> After reading a bit how to set PWM, I don't get the complete picture, 
> what is PDM PWM ? what is the difference between this and "regular" PWM 
> ? is there somewhere drawing on how it work (I look a bit on VHDL code, 
> but it pretty difficult to get the exact way of work).
... snip

This may help:
http://en.wikipedia.org/wiki/Pulse-density_modulation 

-- 
Kirk Wallace
http://www.wallacecompany.com/machine_shop/
http://www.wallacecompany.com/E45/index.html
California, USA


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Re: [Emc-users] hostmot2 PWM

[claude]

Kirk Wallace wrote:
> On Tue, 2010-02-16 at 21:13 +0100, claude wrote:
> ... snip
>   
>> I may use for a future project some MESA card with hostmot2 "firmware". 
>> After reading a bit how to set PWM, I don't get the complete picture, 
>> what is PDM PWM ? what is the difference between this and "regular" PWM 
>> ? is there somewhere drawing on how it work (I look a bit on VHDL code, 
>> but it pretty difficult to get the exact way of work).
>> 
> ... snip
>
> This may help:
> http://en.wikipedia.org/wiki/Pulse-density_modulation 
>
>   
It help! thanks (and I got the name pulse density modulation, can go now 
for a good sleep...)

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[Emc-users] Centralized buying @Mesa Electronics

[Stefan Schluenss]

Hello all,

i try to organize a centralized buying of Mesanet 5I20 cards for the
European country.
Are there any EMC2-users here who are interested in joining us.
The cost per card shall not exceed 160 EUR (incl. VAT). But this depends
on the number of ordered cards.
If there are interests in other cards from MESA electronic, feel free to
ask.

Many greetings from northern Germany,

Stefan.




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Re: [Emc-users] hal modules - i2c, 1wire, uart...

[Jon Elson]

Jeff Epler wrote:
> On Tue, Feb 16, 2010 at 11:35:59AM -0600, Jon Elson wrote:
>   
>> HOWEVER, the Maxim part I think you have in mind is not like that, and
>> it runs about 50 us per bit.
>> 
>
> Ah, I stand corrected.  My recollection was that the bit time of onewire
> was more in the realm of 1ms than tens of us.
>   
Well, he didn't say which one he was planning on, so I took a wild guess.

Jon

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Re: [Emc-users] Lathe threading

[Rudy du Preez]

Andy

Thanks very much for the info on setup for lathe threading, and for the link
to a lot more info on the subject.

I got the setup going within a few minutes after reading your proposals.
The only extra thing I did was to put the input pin from my one-pulse-per-
rev sensor on both the phase-A and phase-Z pins of the encoder. And now the
G33 and G76 codes work. I use position-interpolation. I will fit a proper
encoder on the spindle later.

I am very impressed by the software and the people behind it. Thanks for the
great support as well. It is quite a pleasant experience for me after having
battled with other "popular and cheap" software for many years (of
frustration). I hope I can contribute some day to this community.

Regards
Rudy
 

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