Moving/renaming code

[Pandagineer]

Hello. I got the "Hello World" example to work. Next, because I want the Bitcraze tutorials to remain untouched, I copied "Hello World" to a new folder, and renamed it. More specifically, on the Desktop I created a new folder "Personal_Projects" and I copied all of the files from "..Crazyflie-firmware/examples/app_hello_world" to it, and then I renamed the "app_hello_world" folder to "Measure_Voltage".

But now when I try to run the Measure_Voltage project (which is just Hello World), it doesn't work. I know this because I changed the "Hello World" string slightly, but the Console is still showing the original "Hello World".

When I make the Measure_Voltage project, I don't see any obvious errors. But perhaps I'm not looking closely enough.

Is there something about moving a project that breaks it? Please advise. Thanks!

[krichardsson]

Hi!

There is nothing special with moving a project and it should be fine to move it outside the Crazyflie firmware file tree.

I did a test locally and this is what I did:

1. Copy examples/app_hello_world to /home/kristoffer/code/temp/Measure_Voltage
2. Clean up of the new folder
   2.1 Remove the build directory
   2.2 Remove all .o and .o.cmd files
3. Rename/change stuff
   3.1 src/hello_world.c ==> src/measure_voltage.c
   3.2 Updated the DEBUG_PRINT() to print something else than "hello world"
4. Update build
   4.1 Update src/Kbuild to obj-y += measure_voltage.o
   4.2 Update CRAZYFLIE_BASE in Makefile to point at your crazyflie firmware repo (CRAZYFLIE_BASE := /home/kristoffer/code/bitcraze/crazyflie-firmware in my case)
5. make
6. make cload

You might want to be careful with paths that contains spaces. It can probably be handled but I find that it is easier to avoid.

I think your problems will be solved by step 2. It seems as make clean is not cleaning out everything it should, see bitcraze/crazyflie-firmware#973

[Pandagineer]

Hello. I ran into some errors. Here is the last chunk of my make output:

make[2]: Leaving directory '/home/bitcraze/Desktop/Personal_Projects/Measure_Voltage/build'
make[1]: *** [tools/kbuild/Makefile.kbuild:150: sub-make] Error 2
make[1]: Leaving directory '/home/bitcraze/projects/crazyflie-firmware'
make: *** [/home/bitcraze/Desktop/projects/crazyflie-firmware/tools/make/oot.mk:23: all] Error 2
Make output.txt

Question: in step 4.2, is this intended to point back to the original crazyflie-firmware folder? Can you explain why our new folder needs to point to a second folder? Are there files in the original folder which we did not copy and the new directory still relies on them?

My entire make output is attached.

[krichardsson]

Yes, CRAZYFLIE_BASE should point at the directory with the Crazyflie-firmware source code.

When you build an app you actually build the full firmware + your app code, and the resulting binary is what you flash to the Crazyflie. This is why we need a link to the full firmware source code.

Unfortunately your make output file seems to be empty.

There is also some documentation for out of tree builds that might give some insights?

[Pandagineer]

I will try to attach again.
Make Output.txt

[krichardsson]

It looks like Measure_Voltage.o maybe is missing in your Kbuild file?

[Pandagineer]

Success! Yes, I realized there are two Kbuild files. I had changed both to contain Measure_Voltage.o, but one of them needs to retain src/.
Thanks!

[krichardsson]

Good stuff!
Please also click "mark as answer" to help other users find the solution. Thanks!