rt = ["cortex-m-rt", "atsamd-hal/samd21g-rt"]
panic_halt = ["panic-halt"]
usb = ["atsamd-hal/usb", "usb-device", "usbd-serial"]
rt = ["cortex-m-rt", "atsamd-hal/samd21g-rt"]
panic_halt = ["panic-halt"]
usb = ["atsamd-hal/usb", "usb-device", "usbd-serial"]