Custom Component Questions

[brhs17]

I've started trying to make my own component based on the math tutorial component, but have gotten confused by the names of seemingly similar sections of code:
<enum name="MathOp">
<enum name="Operation">
<enum name="MathOperation">

Also, Is there a way to have components and ports two layers below Ref? I tried by putting a mod.mk file in the directory in Ref that had SUBDIRs = nextLayer, but this didn't work.

[brhs17]

Is there a list of tasks that need to be done to make a component? This would be very helpful so we could just work down the list instead of trying to get an implied list from the math tutorial.

[brhs17]

What do the 0 and 10 arguments mean here:

[timcanham]

0 is the instance of the component if you have more than one (see the init() function of the component). For unit tests, it can always be 0, unless you do different things based on instance. The 10 is a command sequence number you can pick to make sure your code returns the correct one in the command response.

[Azlinkix]

Hi, I'm Sarah Sposato and I am also working on the math components tutorial.
I am running into an error with "make impl"

make: *** No rule to make target `impl'.  Stop.

All of the other steps have been somewhat successful.
I'm still assuming I am in Ref.
I don't see a makefile in Ref for implementation?

[rdaruwala]

Hi Sarah -- You'll want to run make impl from within a component directory to generate the implementation files, not from general Ref application folder. Each component directory requires its own Makefile following the format specified in the tutorial.

[Azlinkix]

Ah I see. Thank you for explaining that!
So if the tutorial says "To generate a set of files for testing, from the module directory type: 'testcomp'---to me this is saying to go into fprime/Md (modules?)

I was getting a similiar "make: *** No rule to make target `testcomp'. Stop." So I figured I was in the wrong place?

[LeStarch]

It is similar to the above comment. Running make impl and make testcomp both should be done in the directory of the Component, Port, or Topology you are working on. These are 'Modules'.

Assuming you put MathSender under 'Ref':

cd fprime/Ref/MathSender
make impl
make testcomp

We will update the tutorial to make it more clear.

[LeStarch]

Note: In order for these to run properly, the mk/config/modules/modules.mk must be updated to add the path Ref/MathSender and make gen_make should be rerun.

[timcanham]

Also note that since make impl and make testcomp are component specific targets, they only work in directories that have component XML.

[LeStarch]

Last updated in April. Closing.