Problem homing with index

Hello,

I also ran into the mentioned problem. I use LinuxCNC 2.8.2 (Mesa 7i92+7i76+7i85+7i84) with Chinese servo drives in velocity mode (speed reference: STEP/DIR).
But during tuning the PID, i realised that these cheap drives has a bug in velocity mode which why i cant use them in this mode.
Therefore i changed it to position mode (Pos ref: Step/Dir), and the encoder feedback want to use for index homing and following error check (following error alarm is working).
My question is, becouse the machine HAL config is fully compleated, can i implement the hostmot2 stepgen part from 2.9.0 to my 2.8.2 config (overwrite the component and recompile the source)?
And the new firmware mentioned by PCW, is for fpga card? Where can i find it?
Or maybe would be easier to use 2.9.0? It is a very accurate Mazak QT-8 lathe with tool setter arm, and must to use index-homing on it.

Thanks, Attila.

It should be possible to recompile just the stepgen module, or the hostmot2 driver, but I wouldn't know where to start.
It might even be possible to copy the
It's probably easiest to switch to 2.9, the existing config should still work fine.

If i use 2.9.0 or recompile the hostmot2 driver, must i update firmware in 7i92 FPGA?

As PCW mentioned in previous message:
"There is new firmware and support in LinuxCNC 2.9
for homing to index on pure step/dir systems if you want to try
it."

If yes, where can i find this firmware?

What hardware do you have?

LinuxCNC standard homing to index with a stepgen requires
firmware that include these features as standard bitfiles do not
have these features.

7i92 + 7i76 (on DB25 connector) + 7i85 (on ribbon cable) + 7i84

Here is a 7I92+7I76+7I85 bitfile with stepgens that have index capability:

Encoders 0..3 are on the 7I85 and share encoder index's  with stepgen index's 0..3
encoder 4 is on the 7I76 and has no stepgen index (just encoder index)