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Thank you for replying so quickly. I am afraid the answer is no. I just loaded Linux and did the stress test because I had rather suspected this old computer would not be very good. I had not realised that BIOS changes were necessary. I will try and find some instructions and give it a go. Is there a list anywhere of the required changes please? If those changes reduce the latency then may be the graphics card might be worth a try.
thanks again

macrimarco001 wrote:

Salve,
Thank you so much for this new resource. I think i'll start playing around with it as soon as i get a Raspberry Pi. i wonder what is the maximum control frequency using this solution.
I see you are a professor. I'm currently a computer engineering student at UniCal. i wish there would be a similar project at my university .
Hope you do well. Thanks again.

I have been retired for a couple of years now.
If you want, I can give you the name of a UniCal teacher who, in addition to knowing me personally, could answer your questions.
In the meantime, I'll see if I can find the digital copy of this thesis which could be a good starting point for your work.
 

Have you done all the suggested BIOS changes to reduce latency?

(disabling all power management, speed-step, hyperthreading, C state > C1 etc etc)

If you only get the error when enabling some motion it may be an EMI issue
Is the 7I96S's frame ground connected to chassis ground?

Also can you report the result of:

sudo chrt 99 ping -i .001 -q -c 60000 10.10.10.10

( This assumes the card IP address is 10.10.10.10 )

The test will take 1 minute



 

the SPI speed depends also on the FPGA-Clock, the SPI-Slave is programmed in verilog and need some clock cycles.

So you need a higher FPGA-Clock or someone have to program a plugin based on the buildin spi slave, but this can not be ported between the different FPGA's (gowin, ice40, ...) and the pins are not freely choosable

I need your help because I'm completely lost.

as at the beginning of this topic, i had an “hm2 error finishing read” problem.
i took the pc to feed a 7i96s i never have the “finishing read” problem.
i bought a new computer with much better latency and constant ping.
I plug in my lathe and it displays “hm2 error finishing read” all time when i ask change tool on my turret and somethime when i enable the drive (F2)...

before :


it used to work fine but now the turret runs for 1 second with this error... and I haven't changed a thing since.

below is the histogram of the new pc

 
 
 

Oh, so it really is as simple as that. capture variables, do math, then set rotation.

Thanks!