Use DIR register for pin direction checking #728
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Replace DIRSET with DIR register when checking if a pin is configured as output in digitalWrite(). DIR is the designated register for reading current pin direction state. According to the SAMD21 datasheet, DIRSET is designed as a write-only register without guaranteed read behavior, while DIR explicitly represents the current direction state. Fixes arduino#727
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Replace DIRSET with DIR register when checking if a pin is configured as output in digitalWrite().
According to the SAMD21 datasheet, DIRSET is designed as a write-only register without guaranteed read behavior, while DIR explicitly represents the current direction state.
Fixes #727