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As show in Arduino Yun schematic [1] GPIO 21 and 22 are connected to output enable pin (OE) of two NTB01xx level shifters. NTB01xx datasheets [2] [3] states that OE pin are active-high therefore we should initialize GPIO 21 (DS_GPIO_OE) and GPIO 22 (DS_GPIO_OE2) accordingly to actually enable level shifters outputs. [1] https://www.arduino.cc/en/uploads/Main/arduino-Yun-schematic.pdf [2] https://www.nxp.com/docs/en/data-sheet/NTB0102.pdf [3] https://www.nxp.com/docs/en/data-sheet/NTB0104.pdf Signed-off-by: Edoardo Scaglia <edoardo.87@gmail.com>