hm2 documentation - encoder

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08 Jun 2020 18:53 #170668 by zz912
I bought an encoder so I could play with it and learn Linux CNC. I found that hostmot2 has a lot of PINs and PARAMETERS for the encoder.
Component Pins:
Owner   Type  Dir         Value  Name
    11  s32   OUT       -114937  hm2_7i96.0.encoder.00.count
    11  s32   OUT             0  hm2_7i96.0.encoder.00.count-latched
    11  bit   I/O         FALSE  hm2_7i96.0.encoder.00.index-enable
    11  bit   OUT         FALSE  hm2_7i96.0.encoder.00.input-a
    11  bit   OUT         FALSE  hm2_7i96.0.encoder.00.input-b
    11  bit   OUT          TRUE  hm2_7i96.0.encoder.00.input-index
    11  bit   IN          FALSE  hm2_7i96.0.encoder.00.latch-enable
    11  bit   IN          FALSE  hm2_7i96.0.encoder.00.latch-polarity
    11  float OUT       -114937  hm2_7i96.0.encoder.00.position
    11  float OUT             0  hm2_7i96.0.encoder.00.position-latched
    11  bit   OUT         FALSE  hm2_7i96.0.encoder.00.quad-error
    11  bit   IN          FALSE  hm2_7i96.0.encoder.00.quad-error-enable
    11  s32   OUT       -113080  hm2_7i96.0.encoder.00.rawcounts
    11  s32   OUT          1857  hm2_7i96.0.encoder.00.rawlatch
    11  bit   IN          FALSE  hm2_7i96.0.encoder.00.reset
    11  float OUT             0  hm2_7i96.0.encoder.00.velocity
    11  float OUT             0  hm2_7i96.0.encoder.00.velocity-rpm
    11  u32   IN     0x017D7840  hm2_7i96.0.encoder.sample-frequency
    11  s32   IN             -1  hm2_7i96.0.encoder.timer-number

Parameters:
Owner   Type  Dir         Value  Name
    11  bit   RW          FALSE  hm2_7i96.0.encoder.00.counter-mode
    11  bit   RW           TRUE  hm2_7i96.0.encoder.00.filter
    11  bit   RW          FALSE  hm2_7i96.0.encoder.00.index-invert
    11  bit   RW          FALSE  hm2_7i96.0.encoder.00.index-mask
    11  bit   RW          FALSE  hm2_7i96.0.encoder.00.index-mask-invert
    11  float RW              1  hm2_7i96.0.encoder.00.scale
    11  float RW            0.5  hm2_7i96.0.encoder.00.vel-timeout

Unfortunately, I can only estimate the meaning of some PINs and PARAMETERS. Is there a manual or help that I can study? I am mechanical designer.

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08 Jun 2020 19:40 #170672 by PCW
Replied by PCW on topic hm2 documentation - encoder
The hostmot2 manual page describes the pins and parameters of all hostmot2 modules

man hostmot2

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10 Jun 2020 09:34 #170932 by zz912
Replied by zz912 on topic hm2 documentation - encoder
Thank you for answer. I have been looking for this information for a long time.

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11 Jun 2020 04:49 #171073 by zz912
Replied by zz912 on topic hm2 documentation - encoder
I did "sudo apt-get update / upgrade"
I have everything up to date.

I did "man hostmost2" and it gave me a manual
LinuxCNC Documentation 2008-05-13 HOSTMOT2 (9)

Do I have an old manual?

Not described here:
- count-latched
- input-index
- latch-enable
- latch polarity
- position-latched
- quad-error
- quad-error-enable
- rawlatch
- ........

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11 Jun 2020 06:39 #171079 by bbsr_5a
Replied by bbsr_5a on topic hm2 documentation - encoder
hi what version of linuxcnc did you install
 (bit in) quad-error-enable
              When  this  pin  is  true quadrature error reporting is enabled.
              when false, existing quadrature errors  are  cleared  and  error
              reporting is disabled

       (bit out) quad-error
              This  bit  indicates  that  a quadrature sequence error has been
              detected.  It can only be set if the  corresponding  quad-error-
              enable bit is true

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11 Jun 2020 08:55 #171096 by zz912
Replied by zz912 on topic hm2 documentation - encoder
LinuxCNC 2.8

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12 Jun 2020 13:00 #171251 by PCW
Replied by PCW on topic hm2 documentation - encoder
There are a bunch of addition to the manual but just in master.

I think most of the encoder latch pin stuff is undocumented
because it was intended for use with probing (so a common
probe input pin can latch all channels) and that's never
been finished on the driver/linuxcnc side

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13 Jun 2020 08:51 #171380 by zz912
Replied by zz912 on topic hm2 documentation - encoder
Thank you for the explanation.

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