2N® Indoor Touch API ... 3. API 3.3 API Functions 3.3.2 GPIO 3.3.2.1 GPIO Pin Reading3.3.2.2 GPIO Pin Setting3.3.2.3 GPIO Pin Locking3.3.2.4 GPIO Pin Unlocking3.3.2.5 Switchable GPIO Direction Getting3.3.2.6 Switchable GPIO Direction Setting3.3.2.7 Active Low Pin Value Setting3.3.2.8 GPIO Input Value Change Detection