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Mild refactoring of the keyboard IO to make the C++ and C# versions as close as possible.

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Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
This commit is contained in:
Adrian Conlon 2019-08-03 11:39:17 +01:00
parent 86d5ae4745
commit 45d1fe605f
1 changed files with 11 additions and 14 deletions
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25
LR35902/src/IoRegisters.cpp
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@ -32,20 +32,17 @@ void EightBit::GameBoy::IoRegisters::Bus_ReadingByte(EightBit::EventArgs) {
// Port/Mode Registers
case P1: {
auto p14 = m_scanP14 && !m_p14;
auto p15 = m_scanP15 && !m_p15;
auto live = p14 || p15;
auto p10 = live && !m_p10;
auto p11 = live && !m_p11;
auto p12 = live && !m_p12;
auto p13 = live && !m_p13;
poke(port,
((int)!p10)
| ((int)!p11 << 1)
| ((int)!p12 << 2)
| ((int)!p13 << 3)
| Chip::Bit4 | Chip::Bit5
| Chip::Bit6 | Chip::Bit7);
auto directionKeys = m_scanP14 && !m_p14;
auto miscKeys = m_scanP15 && !m_p15;
auto live = directionKeys || miscKeys;
auto rightOrA = live && !m_p10;
auto leftOrB = live && !m_p11;
auto upOrSelect = live && !m_p12;
auto downOrStart = live && !m_p13;
auto lowNibble = ((int)!rightOrA) | ((int)!leftOrB << 1) | ((int)!upOrSelect << 2) | ((int)!downOrStart << 3);
auto highNibble = Chip::promoteNibble(Chip::Mask4);
auto value = lowNibble | highNibble;
poke(port, lowNibble | highNibble);
}
break;
case SB: