A hands-on guide to building and flashing NuttX RTOS on three low-cost microcontroller boards: Raspberry Pi Pico (RP2040), Espressif ESP32-DevKitC, and STM32F4Discovery. Covers installing prerequisites, setting up board-specific SDKs and toolchains, compiling NuttX, flashing firmware, and connecting via serial to access the NuttShell (NSH). Each board section includes exact commands and expected output, making it easy to get NuttX running on real hardware quickly.
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