Mutiple Motion Systems & Macro Conflicts in 3.5

dc42

@SumoSniper @adambx I am currently reviewing how conditional GCode commands and multiple motion systems interact. Currently, global, set global and echo commands are only processed by the active file reader; but other commands including abort and the evaluation of conditions in if, elif and while commands is performed by both motion systems. I will change it to execute abort commands only from the active reader; however this will not solve the issue of using global variables in the evaluation of conditions.

Meanwhile, as a workaround it should be sufficient to place the following at the start of each affected macro, to make the inactive file reader skip all of it:

if state.thisInput != null & !state.thisInput.active
  M99

dc42

PS - the firmware binaries at https://www.dropbox.com/scl/fo/p0136wx04h8xf6ejwdnn9/h?rlkey=efrfwyb6o5tqid11gustz3uvy&dl=0 now include the change to execute abort only from the active file stream.

SumoSniper

@dc42 Excellent thanks for that, the workaround should do it for me, will test it out soon.

No doubt picking what gets executed where is a bit of a pickle, similar to the challenges of refactoring code for multithreading.

I wonder if you might not save yourself a bunch of headaches by putting in an optional parameter on M98 that selects the motion system / reader you want to run it on? Then you could have either a default behaviour or a reserved constant you could drop into that so that you can perpetuate macro execution within the same motion system.

eg: A normal macro run is M98 P"foo.g" with optional "S" parameter where -1 is run on calling thread, 0 is run on ALL, 1+ is run on that motion system. Then default could be be -1 which would give the most consistent results for 99% of users.

adambx

Thanks a lot. Will try it out!

SumoSniper

@dc42 I'm getting an error with this code:

if state.thisInput != null & !state.thisInput.active
   M99
Error:  line 8 column 31: meta command: reached primitive type before end of selector string

The position is pointing to the ! on the second selector which is a bit confusing...

edit: I tried to diagnose more:

28/02/2024, 12:03:16 pm 	echo state.thisInput != "null"
Error:  at column 31: meta command: cannot convert operands to same type
28/02/2024, 12:01:37 pm 	echo state.thisInput
0
28/02/2024, 12:01:22 pm 	echo state.thisInput != null
true
28/02/2024, 12:00:59 pm 	echo exists(state.thisInput)
true

But in the object model on DWC it is showing as =null

Further edit: I put echos at the start of the relevant macro to see what was going on and the same outputs are happening - so state.thisInput exists and is returning 0 but not evaluating as null, so it can't find .active and fails out.

dc42

@SumoSniper please try this instead:

if !inputs[state.thisInput].active
  M99

state.thisInput should return 2 when executed by the primary File stream and 12 when executed by the secondary File stream. It should return 0 when executed from the http stream.

o_lampe

@dc42 What would it return when I execute it from daemon.g or a macro? Are those http-calls, too?

dc42

@o_lampe it would return true. The only reason it shows as null in the object model browser is that the fetch of the object model by DWC is not made in the context of any input. If you run:

echo inputs[state.thisInput].active

from the DWC command line then it will return true.

SumoSniper

@dc42 Thanks! That one has fixed it, macros functioning as expected now. Interested to hear where the MMS metacommand handling goes when you've decided on that!

Cheers!

dc42

@SumoSniper @adambx @NineMile @o_lampe I have put new firmware binaries at https://www.dropbox.com/scl/fo/3y4agkmfzfmqcifuecqo3/h?rlkey=j0kibs1tubm5dfj7o2vz1vbzj&dl=0. The main difference is that multiple file readers are now only used if your job file or start.g file uses the new M606 command to fork the file reader (see https://docs.duet3d.com/en/User_manual/Reference/Gcodes#m606-fork-input-file-reader) . Therefore, unless you use that command, macros will only be executed by one reader, which should solve the problem.

If you do use M606 then the behaviour will be as it was previously from that point onwards, and you will need to ensure that any macros executed subsequently to that M606 command are suitable for execution by both file readers. For example, you can ensure that any global variables needed are set up before the M606 command executes. Please note, testing of the M606 command is still in progress.