AAEON AEC-6977 - Manual (Page 113)

E m b e d d e d C o n t r o l l e r A E C - 6 9 7 7
Appendix D Electrical Specifications for I/O Ports D-8
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VOID
SIOEnterMBPnPMode() {
IOWriteByte(SIOIndex, 0x87);
IOWriteByte(SIOIndex, 0x87);
}
VOID SIOExitMBPnPMode() {
IOWriteByte(SIOIndex, 0xAA);
}
VOID SIOSelectLDN(byte LDN) {
IOWriteByte(SIOIndex, 0x07); // SIO LDN Register Offset = 0x07
IOWriteByte(SIOData, LDN );
}
VOID SIOBitSet(byte LDN, byte Register, byte BitNum, byte Value) {
Byte TmpValue;
SIOEnterMBPnPMode();
SIOSelectLDN(byte LDN );
IOWriteByte(SIOIndex, Register);
TmpValue = IOReadByte(SIOData);
TmpValue &= ~(1 << BitNum);
TmpValue |= (Value << BitNum);
IOWriteByte(SIOData, TmpValue);
SIOExitMBPnPMode();
}
VOID SIOByteSet(byte LDN, byte Register, byte Value) {
SIOEnterMBPnPMode();
SIOSelectLDN(LDN);
IOWriteByte(SIOIndex, Register);
IOWriteByte(SIOData, Value );
SIOExitMBPnPMode();
}
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