This article introduces how to create a clone of the open source project "chipKIT" that can develop PIC32 MCUs with Arduino IDE.
"kicad" directory contains a sample circuit diagram for an USB bootloader.
"pic32mx230f" directory contains an example of developing a customized bootloader and an archived built binary for PIC32MX230F064B.
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How to develop PIC32MX MCUs with Arduino IDE/VS Code
How to make chipKIT clone for PIC32MX230F064B