SAMD output pins are used to power the built-in neopixel on some boards, but the pins all default to low (2ma?) drive strength. This is apparently insufficient and can cause color shifts.
This PR sets the DRVSTR bit in the port pin configuration, at the time the neopixel power is turned on in initVariant()
https://github.com/adafruit/ArduinoCore-samd/issues/311
SAMD output pins are used to power the built-in neopixel on some boards, but the pins all default to low (2ma?) drive strength. This is apparently insufficient and can cause color shifts. This PR sets the DRVSTR bit in the port pin configuration, at the time the neopixel power is turned on in initVariant()