Proposed Architecture Lets Arduino UNO R4 WiFi Run Apps Larger Than Its 256 KB Flash

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A new modular firmware architecture aims to overcome the 256 KB internal Flash limit of the Arduino UNO R4 WiFi's Renesas RA4M1 microcontroller. The design splits a large application into independent firmware modules stored on an external non-volatile storage device, with only the currently needed module loaded into the MCU's executable Flash at any given time. The approach resembles historical concepts like overlays and loadable modules, adapted specifically for embedded microcontrollers. It is best suited for sequential applications, automation systems, robotics, and menu-driven devices, but is not ideal for workloads requiring all components to be simultaneously resident with very low latency. The architecture uses SPI to connect the external storage to the RA4M1, which also shares the board with an ESP32-S3 co-processor handling Wi-Fi and Bluetooth.

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ProgrammingDEV Community ·

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ProgrammingDEV Community ·

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ProgrammingDEV Community ·

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