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→Godbolt 1
const int DIRECTION_MASK = 0b00001110;
uint8_t direction = 0b00001010;
// https://github.com/gnea/grbl/blob/master/grbl/stepper.c#L324
DIRECTION_PORT = (DIRECTION_PORT & ~DIRECTION_MASK) | (direction & DIRECTION_MASK);
return 0;
}
