INFRA Signal 413
Comu Fits a 144MHz CH32V203 RISC-V Board Inside a USB-A Port
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A 144 MHz RISC-V microcontroller board fits entirely inside a USB-A port, exposing touch controls and GPIO for embedded experiments.
Engineers can now embed a fully programmable RISC-V device directly into a USB port without external wiring. The form factor enables always-on, low-profile peripherals or debug probes, but the limited GPIO and bootloader timeout constrain real-time use cases. Cost is negligible; integration effort depends on whether the board’s USB-HID or raw-packet modes meet the application’s needs.
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The CH32V203 RISC-V MCU runs at 144 MHz with 224 KB flash and 20 KB SRAM inside a 13 × 9.4 mm USB-A plug.
Four capacitive-touch pads and six test-pad GPIOs are exposed; a 2 KB USB bootloader waits five seconds before launching user code.
Development is supported via ch32fun (bare-metal C/C++), Rust, Arduino, or TinyUSB, with factory examples for HID, serial, and mass-storage modes.
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