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Refactor the keyboard scan code a little more, to make it more comprehensible.

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Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
This commit is contained in:
Adrian Conlon 2019-08-03 17:44:16 +01:00
parent 45d1fe605f
commit 58e074b17f
1 changed files with 5 additions and 5 deletions
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10
LR35902/src/IoRegisters.cpp
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@ -35,11 +35,11 @@ void EightBit::GameBoy::IoRegisters::Bus_ReadingByte(EightBit::EventArgs) {
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 rightOrA = (live && !m_p10) ? 0 : Chip::Bit0;
auto leftOrB = (live && !m_p11) ? 0 : Chip::Bit1;
auto upOrSelect = (live && !m_p12) ? 0 : Chip::Bit2;
auto downOrStart = (live && !m_p13) ? 0 : Chip::Bit3;
auto lowNibble = rightOrA | leftOrB | upOrSelect | downOrStart;
auto highNibble = Chip::promoteNibble(Chip::Mask4);
auto value = lowNibble | highNibble;
poke(port, lowNibble | highNibble);