Compiled programs can be burned into the Trinket M0 just by dragging and dropping a UF2 file on to the Trinket M0 USB drive. There is no need to install the Arduino IDE, source code, or USB serial device driver.
- Download the UF2 file of your choice.
- Plug in the Trinket M0 to the computer.
- Double tap the Trinket M0 reset button.
- When the TRINKETBOOT USB drive appears, drop the UF2 file on to the drive.
- Wait until the Trinket M0 reboots.
At this point, the Trinket M0 is now in USB host mode so it no longer talks with the computer. Unplug the Trinket M0 then plug in a USB OTG to host cable or adapter then plug in a USB device such as a keyboard. Wire up the Trinket M0 UART Tx/Rx, USB (5V) and ground pins.
Since the Trinket M0 appears as UART device, it can be used with any other board with a UART. The board could be running Arduino, CircuitPython, MicroPython, or Espruino. As long as the other board has a UART, it can talk to the USB device through the Trinket M0.