On Friday 20 March 2020 09:14:08 Peter C. Wallace wrote:
> On Thu, 19 Mar 2020, Gene Heskett wrote:
> > Date: Thu, 19 Mar 2020 21:55:55 -0400
> > From: Gene Heskett <ghesk...@shentel.net>
> > Reply-To: "Enhanced Machine Controller (EMC)"
> > <emc-users@lists.sourceforge.net>
> > To: emc-users@lists.sourceforge.net
> > Subject: Re: [Emc-users] A hal question?
> >
> > On Thursday 19 March 2020 19:12:37 Jon Elson wrote:
> >> On 03/19/2020 04:02 PM, Gene Heskett wrote:
> >>> Greetings; I am trying to reduce the f/r error in an ATS667 based
> >>> encoder.
> >>>
> >>> The index pulse is turned upside down by a reversal of spindel
> >>> direction. Tts the nature of the beast to remain in this stable
> >>> state until the approach of the triggering ferrous metal causes
> >>> the first reversal which the edge ignores, and then goes back true
> >>> or false as the ferrous piece crosses the center.
> >>>
> >>>
> >>>
> >>> Does anyone see any problems with that?
> >>
> >> The index pulse is only used during the initial synch to the
> >> spindle, then the encoder is counted
> >> up and down during reversals, without looking at the index
> >> again. So, rigid tapping doesn't care
> >> that the index signal from the encoder does something
> >> different when the spindle is running in
> >> reverse. It has been this way since I did the first ATS667
> >> encoder hack some years ago.
> >>
> >> Jon
> >
> > Thats good news, but it looks as If I'll have to burn a new card to
> > get the pin Peter just told me about, unless mesaflash has grown the
> > ability to work thru an rpspi interface. I did have a machine with
> > all the card firmware on it but had to put it on the G0704 with a
> > new SSD drive after I apparently blew a pci bus driver during a
> > local t-storm. The parport on that box isn't currently in use so
> > I'll have to see if that machine can program a new 7i90HD since I
> > don't believe the pi4 can w/o building a hardware parport for it.
>
> Mesaflash works over SPI on RPI3 and RPI4 (and probably many other
> SBCs) because it uses the kernel SPI driver, not direct hardware
> access. Note that running an older hm2_rpspi driver disables the
> kernel SPI driver so you may have to reboot to run mesaflash if you
> have run LinuxCNC (this has been fixed in master a few months ago)
>
> sudo mesaflash --device 7i90 --interface spi --addr [spi device name]
> --readhmid
>
> (I forget what the first RPI SPI device is named, maybe /dev/spi0.0?)
>
>
> >
> Peter Wallace
> Mesa Electronics
>
> (\__/)
> (='.'=) This is Bunny. Copy and paste bunny into your
> (")_(") signature to help him gain world domination.
>
>
Cheers, Gene Heskett
--
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
If we desire respect for the law, we must first make the law respectable.
- Louis D. Brandeis
Genes Web page <http://geneslinuxbox.net:6309/gene>
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