Hi Rick,
thanks fo responding.
It's a Pi 3 model B+, should be fast enough for this simple task.
on clockWise
-------------------------steps between pos and wait----------------
repeat for sStp times --clockwise
Pi_gpio_output 20, 0 --dir
Pi_gpio_output 21, 1 --step
wait sSpd milliseconds with messages
Pi_gpio_output 21, 0
wait sSpd milliseconds with messages
if the mouse is down
then
Pi_gpio_output 21, 0 --step
set the label of me to "Start"
exit repeat
end if
end repeat
end clockWise
The time between a 1 and a 0 on the output is 1ms. I can lower the speed
and thus increase time, but that does not matter.
I think I tried it once with send in time, not a succes. So maybe i have
to rewrite that with a different mindsetting. I don't have all stack
with me at the moment.
The above piece is from an older stack, but the last is similar.
Also the wait shall not be the most convenient wait to handle this.
It also has of course an counterClockwise handler which is similar, but
then output 20 is a 1.
it should run for so many steps, then wait a few seconds and then
return. If there is one position. If there are more positions, it should
go to those positions too with eqaul steps, then wait on each position,
then return those same positions to the start.
It all works, but due to the single thread, moving the mouse, it
interferes. So in fact LC is to heavy for a single thread. Guess we
would win speed if we got multi-thread. Not just for Raspberry.
Then there is still max LC7.0 for Rasp, so a port to that should also be
made.
Thanks.
Jerry
Op 31-12-2020 om 17:53 schreef Rick Harrison via use-livecode:
Hi Jerry,
What version of Raspberry PI are you using?
If you are using an older version of Raspberry PI just replacing it
with a newer version might be your best work around. The older
PI’s are pretty slow. Have you looked into Banana PI for instance?
While LC isn’t multi-threaded there may be a work around which
could make it behave as though it was. Have you tried Send in Time?
How often are you telling your stepper motor to run? Once in every
10 milliseconds or once in every 20 milliseconds etc?
Good luck!
Rick
On Dec 31, 2020, at 7:20 AM, JeeJeeStudio via use-livecode
<use-livecode@lists.runrev.com> wrote:
Hi,
is it possible to assign threads in LC and why not?
In python you can assign threads, not that i needed that with python, but it is
possible.
I'm playing with a stepper motor (for a while now) on a raspberry and with
python it runs so smooth, with lc it's a different story.
It runs, but when moving the mouse, the motor is responding to that. This
should not happen, but probably because LC is a bit more heavy in use and use
only one thread for graphics and other things.
If more threads could be use then most probably it would run smooth too.
Now working with simplGui to have a GUI, which is quite easy, and now trying to
solve that gui actions also do what needs to be done. More work, less easy than
lc, but slowly we are getting there.
I'm not a fan of python.
Long story short, are multiple threads possible in LC and/or when will that be
implemented?
Thanks and Happy 2021!
Jerry
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