Harmony v3 Peripheral Libraries on SAM L10: Step 4
Step 4: Generate Code
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Navigate to the Projects tab to view the project tree structure.
The MHC will include all the MPLAB Harmony library files and generate the code based on the MHC selections. The generated code would add files and folders to your Harmony project as shown.
Among the generated code, notice the Peripheral Library files generated for Real-Time Clock (RTC), SERCOM 1 (as I²C), SERCOM 0 (as Universal Synchronous Asynchronous Receiver Transmitter (USART)), Direct Memory Access (DMA), External Interrupt Controller (EIC), and PORT peripherals. The MHC also generates template main file (main_l10.c).
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Build the project by clicking on the Clean and Build icon
and verify that the project builds successfully.

At this point, you are ready to start implementing your application code.