Can't SIM programs with spindle speed over 12500rpm

Hi,From few month program SIM (not on the CNC) are stucking before controled movement (not G0). By chance, I have fond that reducing spindle speed unlock the program.
I take a look a the HAL configuration and check some values with HalShow. Starting from spindle-speed-cmd to spindle-at-speed, There is a calculation error between sim_encoder_0.speed input pin and encoder_0.velocity output pin.

Attached a calc file with some values of tested values
Version info : LCNC 2.9.8 Run In Place SIM on LinuxMint 22.3 (6.8.0-117-generic

Did you try editing the ini file for the sim?

Yes
The ini file is from gmoccapy sim sample
Only adjusted machine size and speeds according to real cnc.

The BASE_PERIOD in the sim config is too low for that spindle speed so the sim_encoder component cannot calculate the speed correctly.
Setting a lower BASE_PERIOD in the gmoccapy.ini increases the possible maximum spindle speed
 

Very nice
Set BASE_PERIOD to 5000. spindle_at_speed works correctly.
Thanks for help !

50000

Yes 50000

I came across this issue in QtPyVCP/Probe Basic because they share the same spindle_sim.hal as Gmoccapy.

It's really not ideal to have a simulated config be non-functional for spindle speeds ≥12500rpm at the default base period of 100000ns, I know it can be 'fixed', but ideally it should work by default, high speed spindles are not rare now.

Is there a reason why instead of modifying the base period, the value of sim_encoder_0.ppr (and therefore also encoder_0.position.scale) can't be decreased?
Is there actually a reason to sample this frequently in a simulated config?

I'm naively assuming that it is because this logic predates high speed spindles being easy to get hold of, so it wasn't seen as an issue at the time?