'error finishing read' with 7i80/7i90 combo

I have a 7i80 ->7i44->7i90
->stmbl

using just HAL session (linuxcnc master), I can run the cards with seemingly no problem but, I get the error:

'hm2/hm2_7i80.0: error finishing read! iter=1365116'

if I set an output on the 7i90 with:

setp hm2_7i80.0.7i90.0.0.p3-out-23 true

Any idea what that could be - any other info you need?

Chris M

Yeah, "error finishing read" usually means you have lost all contact with the
FPGA card (7I80 in this case) possibly caused by a complete power failure or
FPGA card reset.

Thank you - that lead me to the temporary power supply not having enough current for the optos to be turned on when setting outputs.

Chris

@pcw
Sir woudent it be Good to adress this in the Documentation of the MESA stuff
as so many try them out first and run in Issues / errors they woudt never see on Mashine side
with full power

as i did also face this with my 7i92 test

So to just finish this ...

I originally had 5 volt power to the 7i80 and 7i44 - i had missed the 7i90.
If I set an output on the 7i90 it would kill the sserial service.

Then I added 5volt power to the 7i90 and could set an output.
but i couldn't set two outputs....

Finally after setting the single output on the 7i90 then measuring the supply voltage on the 7i80 - it was down to ~4.20v (~4.9 without the output on)

I added a higher current supply to the 7i80 and that has seemed to fixed the problem.
I did seem counter-intuitive that the 7i90's outputs would effect the 7i80's supply voltage... considering there is a powered 7i44 between then.

Chris M