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Add more of the MC6850 internals.

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Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
This commit is contained in:
Adrian Conlon 2018-09-23 20:31:55 +01:00
parent b3faa0bb2e
commit d77c2a1e9d
6 changed files with 42 additions and 21 deletions
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13
MC6809/test/Board.cpp
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@ -33,6 +33,10 @@ void Board::initialise() {
CPU().reset();
ACIA().powerOn();
ACIA().RW() = EightBit::Chip::PinLevel::Low; // Write
ACIA().RS() = EightBit::Chip::PinLevel::Low; // Registers
EightBit::Processor::setFlag(ACIA().DATA(), EightBit::mc6850::CR0 | EightBit::mc6850::CR1);
ACIA().step(1); // Get the reset out of the way...
}
void Board::Cpu_ExecutingInstruction_Debug(EightBit::mc6809&) {
@ -66,16 +70,15 @@ EightBit::MemoryMapping Board::mapping(uint16_t address) {
}
void Board::Bus_WritingByte_Acia(EightBit::EventArgs&) {
ACIA().RW() = EightBit::Chip::Low;
updateAciaPins();
updateAciaPins(EightBit::Chip::Low);
}
void Board::Bus_ReadingByte_Acia(EightBit::EventArgs&) {
ACIA().RW() = EightBit::Chip::High;
updateAciaPins();
updateAciaPins(EightBit::Chip::High);
}
void Board::updateAciaPins() {
void Board::updateAciaPins(const EightBit::Chip::PinLevel rw) {
ACIA().RW() = rw;
ACIA().DATA() = DATA();
ACIA().RS() = ADDRESS().word & EightBit::Chip::Bit0 ? EightBit::Chip::PinLevel::High : EightBit::Chip::PinLevel::Low;
ACIA().CS0() = ADDRESS().word & EightBit::Chip::Bit15 ? EightBit::Chip::PinLevel::High : EightBit::Chip::PinLevel::Low;

6
MC6809/test/Board.h
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@ -48,8 +48,8 @@ private:
void pollKeyboard();
void Cpu_ExecutingInstruction_Debug(EightBit::mc6809& cpu);
void Cpu_ExecutedInstruction_Debug(EightBit::mc6809& cpu);
void Cpu_ExecutingInstruction_Debug(EightBit::mc6809&);
void Cpu_ExecutedInstruction_Debug(EightBit::mc6809&);
void Cpu_ExecutedInstruction_die(EightBit::mc6809&);
@ -60,5 +60,5 @@ private:
void Cpu_ExecutedInstruction_Acia(EightBit::mc6809&);
void updateAciaPins();
void updateAciaPins(EightBit::Chip::PinLevel rw);
};

2
MC6809/test/test.cpp
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@ -11,7 +11,7 @@ int main(int argc, char* argv[]) {
Configuration configuration;
#ifdef _DEBUG
//configuration.setDebugMode(true);
configuration.setDebugMode(true);
#endif
//configuration.setDebugMode(true);

20
MC6850/inc/MC6850.h
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@ -94,13 +94,25 @@ namespace EightBit {
void step(int cycles);
// External access to RDR
void fillRDR(uint8_t data);
private:
uint8_t& TDR() { return m_TDR; } // Transmit data register;
uint8_t& RDR() { return m_RDR; } // Receive data register;
uint8_t& status() { return m_status; }
bool selected();
void reset();
void step();
uint8_t drainRDR(); // External (hacked!) access to RDR
void fillTDR(uint8_t data); // External (hacked!) access to TDR
uint8_t drainTDR(); // External (hacked!) access to TDR
PinLevel m_RXDATA;
PinLevel m_TXDATA;
@ -130,6 +142,12 @@ namespace EightBit {
int m_receiveControl;
// Status registers
bool m_RDRF;
uint8_t m_status;
// Data registers
uint8_t m_TDR;
uint8_t m_RDR;
bool m_firstMasterReset = false;
};
}

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MC6850/src/MC6850.cpp
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22
inc/Processor.h
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@ -11,6 +11,17 @@
namespace EightBit {
class Processor : public Chip {
public:
static void clearFlag(uint8_t& f, const int flag) { f &= ~flag; }
static void setFlag(uint8_t& f, const int flag) { f |= flag; }
static void setFlag(uint8_t& f, const int flag, const int condition) { setFlag(f, flag, !!condition); }
static void setFlag(uint8_t& f, const int flag, const uint32_t condition) { setFlag(f, flag, !!condition); }
static void setFlag(uint8_t& f, const int flag, const bool condition) { condition ? setFlag(f, flag) : clearFlag(f, flag); }
static void clearFlag(uint8_t& f, const int flag, const int condition) { clearFlag(f, flag, !!condition); }
static void clearFlag(uint8_t& f, const int flag, const uint32_t condition) { clearFlag(f, flag, !!condition); }
static void clearFlag(uint8_t& f, const int flag, const bool condition) { setFlag(f, flag, !condition); }
// b: number of bits representing the number in x
// x: sign extend this b-bit number to r
static int8_t signExtend(int b, uint8_t x);
@ -36,17 +47,6 @@ namespace EightBit {
virtual register16_t peekWord(register16_t address) = 0;
protected:
static void clearFlag(uint8_t& f, const int flag) { f &= ~flag; }
static void setFlag(uint8_t& f, const int flag) { f |= flag; }
static void setFlag(uint8_t& f, const int flag, const int condition) { setFlag(f, flag, !!condition); }
static void setFlag(uint8_t& f, const int flag, const uint32_t condition) { setFlag(f, flag, !!condition); }
static void setFlag(uint8_t& f, const int flag, const bool condition) { condition ? setFlag(f, flag) : clearFlag(f, flag); }
static void clearFlag(uint8_t& f, const int flag, const int condition) { clearFlag(f, flag, !!condition); }
static void clearFlag(uint8_t& f, const int flag, const uint32_t condition) { clearFlag(f, flag, !!condition); }
static void clearFlag(uint8_t& f, const int flag, const bool condition) { setFlag(f, flag, !condition); }
Processor(Bus& memory);
virtual ~Processor() = default;