Graham S.

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6 years, 11 months ago.

Mbed-os 5.4, offline, purpose of mbed_config.h file? SW4STM32

Hi, looking for some insight.

I'm working with 5.4.4 in System Workbench 1.14. When you export a project from mbed-cli and you get a file called mbed_config.h. It appears to have helpful configuration parameters like this:

#define MBED_CONF_RTOS_PRESENT                      1    // set by library:rtos
#define MBED_CONF_PLATFORM_STDIO_BAUD_RATE          9600 // set by library:platform

Except that by default mbed_config.h is NOT included anywhere, so is ignored. Values here do nothing. On first compile you get an error because RawSerial.h and Serial.h are both looking for MBED_CONF_PLATFORM_DEFAULT_SERIAL_BAUD_RATE value and can't find it. It seems like the intention was to use mbed_config.h, but these modules can't see it by default.

Also in mbed.h, the rtos.h include is conditional on MBED_CONF_RTOS_PRESENT being defined. rtos.h is NOT included in the default project mbed-cli gives you, again because mbed_config.h is not referenced anywhere. But if I turn this flag on, there are a lot of new compile errors inside Events folder.

So mbed_config.h:

  • Looks like it is meant for us to include
  • But is not actually included by default
  • Starts breaking things if you manually include it

Are we meant to include mbed_config.h in our project?

Thanks!

1 Answer

Jan Jongboom
6 years, 11 months ago.

Hi, it should be built actually. If I export to Makefile the file is included in the build command (so no need to #include yourself):

C_FLAGS += mbed_config.h
CXX_FLAGS += mbed_config.h

If that's not the case when exporting to Systems Workbench then that would be a bug.

The file is ignored when building with mbed CLI as you can override using mbed_app.json.

Accepted Answer