Where is mbed_app.json located?

Mbed OS
1

Hi,

I use Mbed studio 1.3.1 with mbed-os 6 (win10 64bit).

I want to modify my application configuration in mbed_app.json file to override the parameter target.printf_lib with the value std. But I don’t understand where is this file located in my project. Where should this file be located?

2

Hi Mikhail,

Ideally, mbed_app.json file should be located in the root folder of your program. You can find a good example of that file in this repository: GitHub - ARMmbed/mbed-os-example-pelion: Mbed OS example for Pelion Device Management

Thanks,
Arek - Mbed Studio team

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3

Do I need to create this file manually? If I create an empty project or a project with an example (blink in MBED OS6) it will be created without this file.

4

Hi Mikhail,

At the moment you need to create it manually. The official Blinky example (GitHub - ARMmbed/mbed-os-example-blinky: Blinky example for Mbed OS 6.0) does not contain this file in the repository. That’s why you do not see it when creating a new Blinky program.
We are considering adding a generator wizard and special viewer for this file in Studio in the future.

Thanks,
Arek - Mbed Studio team

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5

Once I create the mbed_app.json file and include it in the root folder of my program, do I also need to include it in main.cpp with an include statement?

6

Hello,

nope it is not required and it is not possible.
The .json files are here for configuration of the MbedOS and these settings are converted to preprocessor macros (mbed_config.h in build folder of your project) during MbedOS build phase. That also means how you change these settings in a .json file, then whole MbedOS must be recompiled.

BR, Jan

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