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J. Nick Koston
62bb8aeeda
When an expander has only output pins configured, loop() was still running every iteration to invalidate the read cache. Since no digital_read() calls will ever be made, this work is wasted. Now disable_loop() is called unconditionally in setup(). For polling mode, loop is re-enabled only when pin_mode() registers an input pin. For interrupt-driven mode, behavior is unchanged as the ISR already manages loop enablement.
