Digital Input

If i have this in hal
and this subroutine code

How can change this code to check if spindle is stopped
if i have not set this pin

In reality spindle is connected to mesa daughter card 7i33
and i want to check from subroutine code if it is stopped.

is "mesa-input-pin" just a placeholder?

I don't really understand the question. Are you wanting to not have the HAL entry for some reason?

The code needs a digital input pin for stopped-spindle to work
because i do not have this stopped-spindle digital input how can check
in subroutine code if spindle is stopped ?

mesa_input_pin can be hm2_7i80.0.gpio.003.in

Probably what you need is spindle.0.at-speed but its true when running
Being a mesa card your pin probably has a matching .not signal otherwise, use the not component to invert the signal

So this code does the same thing?
(pwmgen.00 is the spindle pwmgen)

If you want to be sure that the spindle is actually stopped, then use something like a HAL "wcomp" to provide a "true" signal when the spindle encoder velocity is very close to zero.

linuxcnc.org/docs/stable/html/man/man9/wcomp.9.html