mirror of
https://github.com/MoleskiCoder/EightBit.git
synced 2024-11-19 02:08:25 +00:00
91 lines
3.2 KiB
C++
91 lines
3.2 KiB
C++
#include "stdafx.h"
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#include "Board.h"
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Board::Board(const Configuration& configuration)
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: m_configuration(configuration),
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m_cpu(EightBit::mc6809(*this)),
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m_disassembler(m_cpu) {
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std::vector<uint8_t> content(m_unused2000.size());
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std::fill(content.begin(), content.end(), 0xff);
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m_unused2000.load(content);
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}
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void Board::initialise() {
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const auto directory = m_configuration.getRomDirectory() + "\\";
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loadHexFile(directory + "ExBasROM.hex");
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if (m_configuration.isDebugMode()) {
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CPU().ExecutingInstruction.connect(std::bind(&Board::Cpu_ExecutingInstruction_Debug, this, std::placeholders::_1));
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CPU().ExecutedInstruction.connect(std::bind(&Board::Cpu_ExecutedInstruction_Debug, this, std::placeholders::_1));
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}
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CPU().ExecutedInstruction.connect(std::bind(&Board::Cpu_ExecutedInstruction_die, this, std::placeholders::_1));
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WritingByte.connect(std::bind(&Board::Bus_WritingByte_Acia, this, std::placeholders::_1));
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ReadingByte.connect(std::bind(&Board::Bus_ReadingByte_Acia, this, std::placeholders::_1));
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CPU().ExecutedInstruction.connect(std::bind(&Board::Cpu_ExecutedInstruction_Acia, this, std::placeholders::_1));
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CPU().powerOn();
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CPU().raise(CPU().NMI());
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CPU().raise(CPU().FIRQ());
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CPU().reset();
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ACIA().powerOn();
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ACIA().RW() = EightBit::Chip::PinLevel::Low; // Write
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ACIA().RS() = EightBit::Chip::PinLevel::Low; // Registers
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EightBit::Processor::setFlag(ACIA().DATA(), EightBit::mc6850::CR0 | EightBit::mc6850::CR1);
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ACIA().step(1); // Get the reset out of the way...
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}
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void Board::Cpu_ExecutingInstruction_Debug(EightBit::mc6809&) {
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m_disassembleAt = CPU().PC();
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m_ignoreDisassembly = m_disassembler.ignore();
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}
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void Board::Cpu_ExecutedInstruction_Debug(EightBit::mc6809&) {
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if (!m_ignoreDisassembly)
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std::cout << m_disassembler.trace(m_disassembleAt) << std::endl;
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}
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void Board::Cpu_ExecutedInstruction_die(EightBit::mc6809&) {
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static uint64_t instructions = 0UL;
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if (++instructions > 90000000)
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CPU().powerOff();
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}
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EightBit::MemoryMapping Board::mapping(uint16_t address) {
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if (address < 0x8000)
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return { m_ram, 0x0000, EightBit::MemoryMapping::ReadWrite };
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if (address < 0xa000)
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return { m_unused2000, 0x8000, EightBit::MemoryMapping::ReadOnly };
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if (address < 0xc000)
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return { m_io, 0xa000, EightBit::MemoryMapping::ReadWrite };
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return { m_rom, 0xc000, EightBit::MemoryMapping::ReadOnly };
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}
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void Board::Bus_WritingByte_Acia(EightBit::EventArgs&) {
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updateAciaPins(EightBit::Chip::Low);
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}
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void Board::Bus_ReadingByte_Acia(EightBit::EventArgs&) {
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updateAciaPins(EightBit::Chip::High);
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}
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void Board::updateAciaPins(const EightBit::Chip::PinLevel rw) {
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ACIA().RW() = rw;
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ACIA().DATA() = DATA();
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ACIA().RS() = ADDRESS().word & EightBit::Chip::Bit0 ? EightBit::Chip::PinLevel::High : EightBit::Chip::PinLevel::Low;
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ACIA().CS0() = ADDRESS().word & EightBit::Chip::Bit15 ? EightBit::Chip::PinLevel::High : EightBit::Chip::PinLevel::Low;
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ACIA().CS1() = ADDRESS().word & EightBit::Chip::Bit13 ? EightBit::Chip::PinLevel::High : EightBit::Chip::PinLevel::Low;
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ACIA().CS2() = ADDRESS().word & EightBit::Chip::Bit14 ? EightBit::Chip::PinLevel::High : EightBit::Chip::PinLevel::Low;
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}
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void Board::Cpu_ExecutedInstruction_Acia(EightBit::mc6809&) {
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ACIA().step(CPU().cycles());
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} |