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Board-specific variant of midi2_host targeting the Adafruit Feather RP2040 with USB Type A Host (product 5723). Hardware differences from the Waveshare RP2350-USB-A example: - PIO-USB on GP16/GP17 (vs GP12/GP13) - I2C1 via STEMMA QT on GP2/GP3 (vs I2C0 GP4/GP5) - USB Host 5V power enable on GP18 Display uses three phases: splash screen, spinner while waiting for a device, then live scrolling UMP message view with 6 visible lines. Tested board-to-board: RP2040 Pico (Device) to Feather RP2040 (Host), SSD1306 128x64 OLED showing decoded MIDI 2.0 messages in real time.