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110 lines
3.0 KiB
C++
110 lines
3.0 KiB
C++
//
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// Commodore1540.hpp
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// Clock Signal
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//
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// Created by Thomas Harte on 05/07/2016.
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// Copyright © 2016 Thomas Harte. All rights reserved.
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//
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#ifndef Commodore1540_hpp
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#define Commodore1540_hpp
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#include "../../../Processors/6502/CPU6502.hpp"
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#include "../../../Components/6522/6522.hpp"
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#include "../SerialBus.hpp"
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namespace Commodore {
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namespace C1540 {
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class SerialPortVIA: public MOS::MOS6522<SerialPortVIA>, public MOS::MOS6522IRQDelegate {
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public:
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using MOS6522IRQDelegate::set_interrupt_status;
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SerialPortVIA() : _portB(0x1f) {}
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uint8_t get_port_input(Port port) {
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if(port) {
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return _portB;
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}
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return 0xff;
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}
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void set_port_output(Port port, uint8_t value, uint8_t mask) {
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if(port) {
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std::shared_ptr<::Commodore::Serial::Port> serialPort = _serialPort.lock();
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if(serialPort) {
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serialPort->set_output(::Commodore::Serial::Line::Attention, !(value&0x10));
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serialPort->set_output(::Commodore::Serial::Line::Clock, !(value&0x08));
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serialPort->set_output(::Commodore::Serial::Line::Data, !(value&0x02));
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}
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printf("1540 serial port VIA port B: %02x\n", value);
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}
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else
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printf("1540 serial port VIA port A: %02x\n", value);
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}
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void set_serial_line_state(::Commodore::Serial::Line line, bool value) {
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printf("1540 Serial port line %d: %s\n", line, value ? "on" : "off");
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switch(line) {
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default: break;
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case ::Commodore::Serial::Line::Data: _portB = (_portB & ~0x01) | (value ? 0 : 0x01); break;
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case ::Commodore::Serial::Line::Clock: _portB = (_portB & ~0x04) | (value ? 0 : 0x04); break;
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case ::Commodore::Serial::Line::Attention:
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_portB = (_portB & ~0x80) | (value ? 0 : 0x80);
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set_control_line_input(Port::B, Line::Two, !value); // from active low to active high
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break;
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}
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}
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void set_serial_port(std::shared_ptr<::Commodore::Serial::Port> serialPort) {
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_serialPort = serialPort;
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}
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private:
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uint8_t _portB;
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std::weak_ptr<::Commodore::Serial::Port> _serialPort;
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};
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class SerialPort : public ::Commodore::Serial::Port {
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public:
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void set_input(::Commodore::Serial::Line line, bool value) {
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std::shared_ptr<SerialPortVIA> serialPortVIA = _serialPortVIA.lock();
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if(serialPortVIA) serialPortVIA->set_serial_line_state(line, value);
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}
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void set_serial_port_via(std::shared_ptr<SerialPortVIA> serialPortVIA) {
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_serialPortVIA = serialPortVIA;
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}
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private:
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std::weak_ptr<SerialPortVIA> _serialPortVIA;
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};
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class Machine:
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public CPU6502::Processor<Machine>,
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public MOS::MOS6522IRQDelegate::Delegate {
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public:
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Machine();
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unsigned int perform_bus_operation(CPU6502::BusOperation operation, uint16_t address, uint8_t *value);
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void set_rom(const uint8_t *rom);
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void set_serial_bus(std::shared_ptr<::Commodore::Serial::Bus> serial_bus);
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// to satisfy MOS::MOS6522::Delegate
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virtual void mos6522_did_change_interrupt_status(void *mos6522);
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private:
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uint8_t _ram[0x800];
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uint8_t _rom[0x4000];
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std::shared_ptr<SerialPortVIA> _serialPortVIA;
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std::shared_ptr<SerialPort> _serialPort;
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};
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}
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}
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#endif /* Commodore1540_hpp */
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