Is there a guide that can help me transition from MLA to Harmony?

Yes, the MPLAB® Harmony help file has Microchip Libraries for Applications (MLA) to Harmony porting guides for middleware software (USB, TCP/IP, Graphics, etc.). These porting guides can be found in the "Porting to MPLAB® Harmony" section. Also, see the Migration Guides section of the Harmony landing page.

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