AOpen WARM TOUCH WT19M-RH, Manual

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or byte_value, 0x01 ; Set the related bits. ( "Enable/Disable GPIO Port", for example )
out byte_value. 0x4f ; Set the register value into chip.
out 0x4e, 0xaa ; Disable register read/write by softeare.
The register's in datasheet; you can reference to the attached file.
The session is "8.6 GPIO Registers(CR06)" in page 87.
You have to program the following registers in basic:
CR06 Index F0h[1] = 0/1 = GPIO01(COM Connector Pin 36) as input/output pin
CR06 Index F0h[2] = 0/1 = GPIO02(COM Connector Pin 38) as input/output pin
CR06 Index F0h[4] = 0/1 = GPIO04(COM Connector Pin 40) as input/output pin
CR06 Index F1h[1] = 0/1 = GPIO01(COM Connector Pin 36) with a Lo/Hi voltage output while it is
output mode.
CR06 Index F1h[2] = 0/1 = GPIO02(COM Connector Pin 38) with a Lo/Hi voltage output while it is
output mode.
CR06 Index F1h[4] = 0/1 = GPIO04(COM Connector Pin 40) with a Lo/Hi voltage output while it is
output mode.
CR06 Index F2h[1] = 0/1 = GPIO01(COM Connector Pin 36) read as a Lo/Hi voltage input while it is
input mode.
CR06 Index F2h[2] = 0/1 = GPIO02(COM Connector Pin 38) read as a Lo/Hi voltage input while it is
input mode.
CR06 Index F2h[4] = 0/1 = GPIO04(COM Connector Pin 40) read as a Lo/Hi voltage input while it is
input mode.
The following setting is by your add-board design: