Board Test

Example source: examples/device/board_test

A minimal bring-up test that exercises a board’s basic I/O without using the USB stack. Both the device and host stacks are disabled (CFG_TUD_ENABLED/CFG_TUH_ENABLED are 0), so this is the first thing to run when porting to new hardware.

What it does

  • Blinks the on-board LED. The interval changes with the button: 1000 ms when the button is not pressed, 250 ms while it is held.

  • Prints Hello from TinyUSB over stdout/UART on each blink.

  • Echoes any character received on UART back out.

(No USB class interfaces are present — this example does not enumerate as a USB device.)

Configuration

Notable tusb_config.h settings:

#define CFG_TUD_ENABLED   0   // device stack disabled
#define CFG_TUH_ENABLED   0   // host stack disabled

Building

CMake:

mkdir build && cd build
cmake -DBOARD=raspberry_pi_pico ..
cmake --build .

Make:

make BOARD=raspberry_pi_pico all

Try it

Flash the firmware and watch the on-board LED blink. Open the board’s UART (serial console) to see Hello from TinyUSB printed repeatedly, and type characters to see them echoed back. Press and hold the button to speed up the blink rate.