WynMax Atom D2550, User Manual

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// Select Logic Device 7
outp(0x002E, 0x07);
outp(0x002F, 0x07);
// Active Logic Device 7
outp(0x002E, 0x30);
outp(0x002F, 0x01);
// Select Inversion Mode
outp(0x002E, 0xF2);
outp(0x002F, (inp(0x002F) & 0x3C) | ( Inversion Register & 0xC3));
// Select I/O Mode
outp(0x002E, 0xF0);
outp(0x002F, (inp(0x002F) & 0x3C) | ( I/O Selection Register & 0xC3));
// Access GPIO ports
outp(0x002E, 0xF1);
outp(0x002F, (inp(0x002F) & 0x3C) | ( Output Data & 0xC3));
or
Input Data = inp(0x002F);
// Exit Extended Function Mode
outp(0x002E, 0xAA);
Definitions of Variables:
Each bit in the lower nibble of each Register represents the setting of a GPIO port.
Super IO Pin Bit GPIO DIO
128 0 GPIO DIO-Out0
127 1 GPIO DIO-Out1
126 2 GPIO DIO-In0
125 3 GPIO DIO-In1
124 4 GPIO DIO-In2
123 5 GPIO DIO-In3
122 6 GPIO DIO-Out2
121 7 GPIO DIO-Out3