Low Power Application on SAM L21 Using Harmony v3 Peripheral Libraries: Step 5
Step 5: Generate Code
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Examine the updated project tree of the new generated code.
MHC will include all the MPLAB Harmony library files and generate the code based on the MHC selections. The generated code will add files and folders to your Harmony project. Among the generated code, notice the peripheral library file generated for ADC. Be aware that the same pattern is applied to all the peripheral libraries added to the project (RTC, SERCOM 2 (as I²C), SERCOM 3 (as USART), DMA, PM, EIC, EVSYS, SUPC, and PORT peripherals). MHC also generates the template main file (main.c).
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Build the code by clicking on the Clean and Build button
and verify that the project builds successfully.

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