Define BUTTON_1 for the Adafruit nrf52 Feather
Define BUTTON_1 for the Adafruit nrf52 Feather

This button is labelled as DFU, and is a general purpose GPIO line

mlaz/mynewt-core,mlaz/mynewt-core,mlaz/mynewt-core,mlaz/mynewt-core,mlaz/mynewt-core