Commits on Apr 6, 2019
* Fix breakage in NRF51 support introduced by #dba8825 * Re-enable interrupts in between writing LED data for ARM M0. This adds support for FASTLED_ALLOW_INTERRUPTS to ARM M0-based platforms (e.g. SAMD21). This fixes the clock getting off when using more than ~30 LEDs, since Arduino uses an interrupt to increment the millis clock. This uses SysTick->VAL to determine whether more than 45uSecs have elapsed while interrupts were enabled. This isn't as correct as using a dedicated timer, but it does work on all ARM M0 platforms.