Modular External-Firmware Architecture for Arduino UNO R4 WiFi
1. Executive Summary This report describes a proposed architecture for overcoming the practical program-size limitation of a microcontroller by dividing a large application into independently loadable firmware modules stored in external non-volatile storage. The core concept is: Only the currently required module must occupy the Arduino's internal program Flash, while the complete collection of modules can reside in much larger external storage. For the Arduino UNO R4 WiFi, the main Renesas RA4…