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How to compile Firmware / Bootloaders for BlueberryE Uno335

The BlueberryE Uno335 Firmware & Bootloaders

This post is about compiling firmware and bootloaders for the Uno335 a specialized variant of the wellknown Arduino/Genuino Uno board. The most significant changes are an onboard 512kbit serial SRAM and levelshifters to 5V to 3.3V for SPI and I2C, but this is not what this post is about.

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