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SAMD CORE 1.6.10
* the linker script is use should define __text_start__ symbol at the beginning of .text section
* digitalPinToInterrupt #define moved to Arduino.h, variant.h must no longer define it
SAMD CORE 1.6.3
* Timer for pin PWM selected based on value of PIN_ATTR_TIMER_ALT or PIN_ATTR_TIMER,
prior to this "pin type" (ulPinType) was used