Which Header Files Are Used?

MCU header files are installed in the Device Family Packs (DFPs) which are installed in various locations on your PC:

  • DFP artifacts embedded within a Harmony 3 Project
  • DFP artifacts installed with the compiler
  • DFPs installed/maintained by the IDE


When you build a project in MPLAB® X, which header files are used in the build?


Priority 1 - Search Project Files

The first location searched is the project itself. MPLAB Harmony 3 projects are self-contained. DFPs in the IDE and XC32 are ignored.

priority-1-project-dfps.png

Priority 2 - Search IDE-Managed DFPs

If no local header files are found in the project, the DFPs in the IDE are used. The version can be selected in the Project Properties window.

priority-2-ide-dfps.png

DFPs in the XC compilers are normally ignored unless you override the IDE setting:

dfp-override-setting.png

Selecting the DFP Version used by the IDE

1

Click on the current DFP's icon in the Dashboard.

selecting-dfp-step-1.png

2

Select a different DFP in Project Properties to use it.

selecting-dfp-step-2.png

Priority 3 - Search Compiler DFPs

If no other DFP is present, the XC compiler can use its own header files:

priority-3-compiler-dfps.png


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