Re: [Emc-users] Parport Bulk Write
On Sat, Nov 06, 2010 at 03:36:42PM -0700, Kirk Wallace wrote:
On Sat, 2010-11-06 at 11:49 -0700, Kirk Wallace wrote:
I am starting to think about how to put an eight bit word on a parallel
port. My first guess is to load Parport, then write a component that
shifts an unsigned variable a bit at a time to each parport pin, but I
wonder if there is a cleaner way to write the whole (8bit) word to, lets
say, pins 2-9? This will be used with a strobe component to latch data
to an AVR port.
It turns out this is pretty trivial:
http://www.wallacecompany.com/machine_shop/EMC2/AVR/conv_u32_8bits.comp
Kirk, to grab the lowest byte of a uint32_t, I'd be tempted to just do a
typecast in an assignment:
In file: test1.c
#include stdint.h
int main ()
{
uint32_t given ;
uint8_t needed ;
needed = (uint8_t) given ;
}
$ gcc test1.c -Wa,-ahdl=test1.lst
That compiles without errors, and gives some intel assembler in
test1.lst, with (satisfyingly) a movb in the middle of it. The rest is
stage setting, AFAICT. (8 bit intel is OK by me, but I haven't grubbed
in x86, so I have to squint and guess that much of it is preamble and
postample, pushing and popping a stack frame.)
Now there's just the write of the uint8_t to the parport address, and
pulse the strobe line, as you've mentioned. (i.e. the tricky part,
unless an oscilloscope is to hand to check the (presumably) software
timing of the strobe duration.)
Erik
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Re: [Emc-users] Synchronized Component
Am 06.11.2010 19:33, schrieb Kirk Wallace:
Thanks Ulf. This is what I have so far:
http://www.wallacecompany.com/machine_shop/EMC2/AVR/strobe-1a.jpg
http://www.wallacecompany.com/machine_shop/EMC2/AVR/ServoPStart.comp
Hi Kirk
Try this, the other one is worse. This looks cleaner, compiles and is tested.
halcmd loadrt ServoPStart
halcmd addf ServoPStart.0.doreset servo-thread
halcmd addf ServoPStart.0.docount base-thread
component ServoPStart This component is part of a parport interface to an
AVR ATtiny2313.(2010/11/05 kwall...@wallacecompany.com);
pin out bit ServoStart This is the output which goes high for one period at
the input toggle.;
pin out bit strobe foobar;
pin out unsigned PCount=0 ;
//variable unsigned PCount=0; // Holds the number of periods since the
toggle.
function dostrobe nofp;
function doreset nofp;
license GPL;
;;
FUNCTION(doreset) {
PCount=0;
}
FUNCTION(dostrobe) {
strobe=0;
ServoStart=0;
if (PCount==0) ServoStart=1;
if (PCount==3) strobe=1;
PCount++;
}
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Re: [Emc-users] Synchronized Component
On Sat, Nov 06, 2010 at 09:31:31AM -0700, Kirk Wallace wrote: I looked at the source for the edge component. It has a variable called period that isn't declared in the top portion of the component. Does that mean that it is a global variable? If so, is there a convenient source for a list of global variables? http://www.linuxcnc.org/docview/html/hal_comp.html#r1_7 FUNCTION(name) Use this macro to begin the definition of a realtime function which was previously declared with function NAME. The function includes a parameter period which is the integer number of nanoseconds between ^^ calls to the function. Jeff -- The Next 800 Companies to Lead America's Growth: New Video Whitepaper David G. Thomson, author of the best-selling book Blueprint to a Billion shares his insights and actions to help propel your business during the next growth cycle. Listen Now! http://p.sf.net/sfu/SAP-dev2dev ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
[Emc-users] Need a little advice on retroing a CHNC Hardinge
Well, I could use some help fellows! My slow motion Hardinge CHNC project just got speeded up with the demise of the spidle motor on my Pratt and Whitney lathe. What I have got is a stripped machine, the resolvers have been replaced with encoders on the X and Z axiis and new cables pulled through to the connection area on the back of the X axis.Both cables are shielded and drained 6 twisted pair for a total of 12 leads per cable. Questions:Can I run the axis encoder in the same cable as the turret encoder? The turret runs at 12Volts logic, will this cause any crosstalk? How did Hardinge do threading with a resolver on the spindle? I cannot find an index mechanism or any extra leads that would go to one. The spindle resolver is still in place but can be replaced easily with an encoder with index. The plan is to fit this all up with Pico Systems PWM controller which I have at hand and if needs be I have an extra Par port card for extra I/O. Ed. -- The Next 800 Companies to Lead America's Growth: New Video Whitepaper David G. Thomson, author of the best-selling book Blueprint to a Billion shares his insights and actions to help propel your business during the next growth cycle. Listen Now! http://p.sf.net/sfu/SAP-dev2dev ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Need a little advice on retroing a CHNC Hardinge
On Sun, 2010-11-07 at 09:11 -0500, Ed wrote: ... snip Both cables are shielded and drained 6 twisted pair for a total of 12 leads per cable. Questions:Can I run the axis encoder in the same cable as the turret encoder? The turret runs at 12Volts logic, will this cause any crosstalk? I reused my Hardinge cables on my HNC, which I think are straight, unpaired with an overall shield. I have the axis and turret encoder signals running through the same cable, with the turret encoder running on 12 Volts. It seems to work fine. You might consider looking into methods of terminating the wire pairs. Such as impedance matching resistors, although this may be more appropriate for differential signaling. http://www.epanorama.net/documents/wiring/cable_impedance.html http://en.wikipedia.org/wiki/Twisted_pair http://www.maxim-ic.com/app-notes/index.mvp/id/763/CMP/WP-1 How did Hardinge do threading with a resolver on the spindle? I cannot find an index mechanism or any extra leads that would go to one. The spindle resolver is still in place but can be replaced easily with an encoder with index. I believe the resolver is an absolute encoder so the index feature is inherent. http://en.wikipedia.org/wiki/Resolver_%28electrical%29 I replaced my spindle resolver and tachometer with a quadrature encoder. http://www.wallacecompany.com/cnc_lathe/HNC/00011-1a.jpg I had problems with interference on the index signal, which I cleared up with a mains filter on the spindle VFD. You can see more here: http://www.wallacecompany.com/cnc_lathe/HNC/ The plan is to fit this all up with Pico Systems PWM controller which I have at hand and if needs be I have an extra Par port card for extra I/O. Ed. That's the setup I have. -- Kirk Wallace http://www.wallacecompany.com/machine_shop/ http://www.wallacecompany.com/E45/index.html California, USA -- The Next 800 Companies to Lead America's Growth: New Video Whitepaper David G. Thomson, author of the best-selling book Blueprint to a Billion shares his insights and actions to help propel your business during the next growth cycle. Listen Now! http://p.sf.net/sfu/SAP-dev2dev ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Synchronized Component
On Sun, 2010-11-07 at 07:35 -0600, Jeff Epler wrote: FUNCTION(name) Use this macro to begin the definition of a realtime function which was previously declared with function NAME. The function includes a parameter period which is the integer number of nanoseconds between ^^ calls to the function. Thanks Jeff. This has gotten me to go back and reread the .comp documentation. Now I have more issues to work out than before. I do have a pair of clumsy .comp's that get the job done for now, but I will need to formalize them later. -- Kirk Wallace http://www.wallacecompany.com/machine_shop/ http://www.wallacecompany.com/E45/index.html California, USA -- The Next 800 Companies to Lead America's Growth: New Video Whitepaper David G. Thomson, author of the best-selling book Blueprint to a Billion shares his insights and actions to help propel your business during the next growth cycle. Listen Now! http://p.sf.net/sfu/SAP-dev2dev ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Problem:System suddenly constantly resetting.
On 11/5/2010 5:03 PM, Ulf Dambacher wrote: Hi everybody I just re-assembled my maho 800 with a new hmi and now I have a strange problem: I can activate emc, but while I activate the machine, activate the motion controllers and do some hand jogging, the process gets stuck, monitor gets dark and it looks like the computer is stuck, graphics card and keyboard are constantly re-initializing. Hi, Ulf. Perhaps you've already tracked down the cause of your problem, but another possibility came to me today. I plugged a vacuum cleaner into a convenient outlet in the basement. When I turned it on, the overhead light dimmed slightly. It seems they were on the same mains circuit. Including whatever else is on that circuit, enough current was being drawn when I added the vacuum cleaner to cause a perceptible power sag. Is there any possibility your computer is experiencing a power sag when you activate your machine? Regards, Kent -- The Next 800 Companies to Lead America's Growth: New Video Whitepaper David G. Thomson, author of the best-selling book Blueprint to a Billion shares his insights and actions to help propel your business during the next growth cycle. Listen Now! http://p.sf.net/sfu/SAP-dev2dev ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Need a little advice on retroing a CHNC Hardinge
On 11/07/2010 8:11 AM, Ed wrote: Well, I could use some help fellows! My slow motion Hardinge CHNC project just got speeded up with the demise of the spidle motor on my Pratt and Whitney lathe. What I have got is a stripped machine, the resolvers have been replaced with encoders on the X and Z axiis and new cables pulled through to the connection area on the back of the X axis.Both cables are shielded and drained 6 twisted pair for a total of 12 leads per cable. Questions:Can I run the axis encoder in the same cable as the turret encoder? The turret runs at 12Volts logic, will this cause any crosstalk? If your encoders are differential, this should be no problem. If not differential, try it and see. It most likely will work fine. How did Hardinge do threading with a resolver on the spindle? Most reslover converters also produce the index signal. If your encoders are A-B only, you need to put an ABZ encoder on the spindle, so you get the index, too. I cannot find an index mechanism or any extra leads that would go to one. The spindle resolver is still in place but can be replaced easily with an encoder with index. The plan is to fit this all up with Pico Systems PWM controller which I have at hand and if needs be I have an extra Par port card for extra I/O. Ed. Oh, well, the Pico Systems resolver converter would provide index from the resolver, so you could use that, or get an encoder with index. Jon -- The Next 800 Companies to Lead America's Growth: New Video Whitepaper David G. Thomson, author of the best-selling book Blueprint to a Billion shares his insights and actions to help propel your business during the next growth cycle. Listen Now! http://p.sf.net/sfu/SAP-dev2dev ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Need a little advice on retroing a CHNC Hardinge
On Tue, Oct 23, 2001 at 11:10:14PM -0500, Jon Elson wrote: I cannot find an index mechanism or any extra leads that would go to one. The spindle resolver is still in place but can be replaced easily with an encoder with index. The plan is to fit this all up with Pico Systems PWM controller which I have at hand and if needs be I have an extra Par port card for extra I/O. Ed. Oh, well, the Pico Systems resolver converter would provide index from the resolver, so you could use that, or get an encoder with index. Jon, I have those same resolvers and I use your resolver converter board. I am pretty sure there are two indexes per revolution. The gearing is 1:1 so I don't think the original spindle resolver can be used this way. Chris -- The Next 800 Companies to Lead America's Growth: New Video Whitepaper David G. Thomson, author of the best-selling book Blueprint to a Billion shares his insights and actions to help propel your business during the next growth cycle. Listen Now! http://p.sf.net/sfu/SAP-dev2dev ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
