Change core lib location in Arduino IDE

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1

Hello,
i am a french stduent (sorry for my bad english...) and i modified the core library (for a project at university) in order to be able the UART to send 9 data bits per frame. It works on my PC and i developed with a custom makefile in CodeBlocks. But i have to make it work in the University with Arduino IDE and i don't have the rights to modifie the folder "/usr/share/arduino", is there a mean to configure the core lib location ?

I have tried to set the "build.core" attribute in preferences.txt, but it didn't work:
I have copied the /usr/share/arduino in /home/USER/.arduino/core and put "build.core=/home/USER/.arduino/core/arduino/hardware/arduino:arduino" in preferences.txt. It does not work, it get the /usr/share/arduino files ...

How can change the core library location ?

Thank you !

2

You could (theoretically) implement a new "board" called something like "UNOw9bitUART"; and have it's core be in a user directory. Users would install your expansion similar to the way they install Arduino Tiny or Sanguino support, and the core would live in something like ~/Arduino/hardware/UNOw9bitUART/avr/cores/* (I think you would have to maintain a parallel set of the rest of the core as well. I haven't seen an obvious way to "replace this one core file and use the standard core for everything else." Perhaps in 1.5.x it will be possible.

3

Thank you for your reply, and it works using:

##############################################################

micro9.name=Arduino 9bit
...
micro9.build.core=../../../../../../home/HOME/.arduino/core/9bit_serial/hardware/arduino/cores
micro9.build.variant=micro

But if in "micro9.build.core", i put "/home/HOME/.arduino/core/9bit_serial/hardware/arduino/cores", it just concatenates with "/us/share/arduino"
Is there a mean to enter a absolute path ?