Mesa inm encoder reset

I have some MPGs connected to a mesa card and showing up as inm encoders in the HAL configuration. Unlike the standard MESA encoders, these don't have a reset pin.
I need a way to scale and to reset these counts I can easily scale them using the scale component but I can't figure out how to reset them. Should I use the HAL encoder component instead?

I need to read the scaled output from gcode.

Yeah, the inm,inmux encoders are really intended for jogging
MPGs which use a relative count

You can reset the output using the offset component
(though you would need to convert from S32 to float first)

so I would need to:
1 convert reset button state, encoder count, and offset to float
2 apply the following arithmetic: offset = offset + (count * -1 * buttonstate)
3 convert offset back to s32

Is there a simpler method?

I have this working satisfactorily with the HAL encoder component. It does lose a few counts when compared to the inm encoder but only if I spin aggressively.

 

Probably simpler to make a reset component
(that removes the current offset when requested and does the type conversions)

The MPG counters are really intended for normal MPG use
(where the count is always relative)

Thanks. I will look into it if the encoders prove to be too slow.

I just added reset capability to inm and inmux (in master)

Would it be easy to get this feature it 2.8?

Somebody on the forum made a branch that does this
(well updated 2.8 with the 2.9 hm2 driver)

If I trusted myself more with git it should not be too hard since
the driver changes don't affect anything else in LinuxCNC

Need to learn a bit about git cherry pick (I've been told that is the way)

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