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I´m using Eclipse IDE with ARM plugin to develop a project on my F4-Discovery. I created an empty template project and started to use functions from stm32 HAL libraries and I got error like:

undefined reference to `HAL_DMA_Init'

undefined reference to `HAL_UART_Init'

Necessary .c and .h files are in the right directories, but Eclipse recognised only half of .c files and the others scratched out. This image explains my problem. What´s wrong? Thanks.

Community
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Jardo421
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3 Answers3

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You need to add an include path to Eclipse CDT. Assuming this is a managed build (as opposed to using an external Makefile), you need to follow the directions here.

Adding Include paths and symbols in Managed Build System

For CDT projects, you can define include paths and preprocessor symbols for the parser. This lets the parser understand the contents of the C/C++ source code so that you can more effectively use the search and code completion features.

If Autodiscovery is enabled, after a build finishes, any discovered paths and symbols will be displayed in the Discovered Paths section. You can also define the properties on a per project basis in the C/C++ Projects or Navigator views.

To add include paths and symbols:

To set properties for your project, right-click your CDT project and select Properties. Alternatively, to set properties for a specific source file in your project, right-click a source file within your make project and select Properties.

  1. Expand C/C++ General and select Paths and Symbols.

  2. Click here to see an illustration (displayed in a separate window).

  3. Click Add to define new element (Include Path, Symbol, Library path etc).

  4. Click Edit to change selected element (Include Path, Symbol, Library path etc).
  5. Click Delete to remove selected element (Include Path, Symbol, Library path etc).
  6. Click Export to make selected element (Include Path, Symbol, Library path etc) exported.
  7. Click Unexport to remove selected element (Include Path, Symbol, Library path etc) from export list.
  8. Click Move up and Move down to set elements (Include Paths, Library paths etc) order.
rost0031
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In properties (Alt+Enter) of file you need, tick off the checkbox says "Exclude resource from build". as shown in this link

Vojtech Vanecek
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"Undefined reference" is likely a linker error. You're not compiling the actual source code of the library you're trying to use.

Go to system > src > stm32f4-hal then right click the library file you're trying to include. Uncheck "exclude from build."

Joyce Lee
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