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TODO

[3585232.736302] usb 1-1.3: new full-speed USB device number 109 using dwc_otg
[3585232.878743] usb 1-1.3: New USB device found, idVendor=2886, idProduct=802f, bcdDevice= 1.00
[3585232.878764] usb 1-1.3: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[3585232.878780] usb 1-1.3: Product: Seeed femto M0
[3585232.878795] usb 1-1.3: Manufacturer: Seeed
[3585232.878811] usb 1-1.3: SerialNumber: 1D5A0BE850553133352E3120FF0A183C
[3585232.881320] cdc_acm 1-1.3:1.0: ttyACM1: USB ACM device

SAMD21G18

http://packs.download.atmel.com/

https://www.seeedstudio.com/Seeeduino-XIAO-Arduino-Microcontroller-SAMD21-Cortex-M0+-p-4426.html