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92 lines
2.0 KiB
Plaintext
92 lines
2.0 KiB
Plaintext
//
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// MOS6522Bridge.m
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// Clock Signal
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//
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// Created by Thomas Harte on 18/06/2016.
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// Copyright 2016 Thomas Harte. All rights reserved.
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//
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#import "MOS6522Bridge.h"
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#include "6522.hpp"
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#include <memory>
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@class MOS6522Bridge;
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class VanillaVIAPortHandler: public MOS::MOS6522::PortHandler {
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public:
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MOS6522Bridge *bridge;
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bool irq_line;
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uint8_t port_a_value;
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uint8_t port_b_value;
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bool control_line_values[2][2];
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/*
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All methods below here are to replace those defined by
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MOS::MOS6522::PortHandler.
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*/
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void set_interrupt_status(bool new_status) {
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irq_line = new_status;
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}
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uint8_t get_port_input(MOS::MOS6522::Port port) {
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return port ? port_b_value : port_a_value;
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}
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void set_control_line_output(MOS::MOS6522::Port port, MOS::MOS6522::Line line, bool value) {
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control_line_values[int(port)][int(line)] = value;
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}
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};
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@implementation MOS6522Bridge {
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VanillaVIAPortHandler _viaPortHandler;
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std::unique_ptr<MOS::MOS6522::MOS6522<VanillaVIAPortHandler>> _via;
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}
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- (instancetype)init {
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self = [super init];
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if(self) {
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_via = std::make_unique<MOS::MOS6522::MOS6522<VanillaVIAPortHandler>>(_viaPortHandler);
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_viaPortHandler.bridge = self;
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}
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return self;
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}
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- (void)setValue:(uint8_t)value forRegister:(NSUInteger)registerNumber {
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_via->write((int)registerNumber, value);
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}
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- (uint8_t)valueForRegister:(NSUInteger)registerNumber {
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return _via->read((int)registerNumber);
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}
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- (void)runForHalfCycles:(NSUInteger)numberOfHalfCycles {
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_via->run_for(HalfCycles((int)numberOfHalfCycles));
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}
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- (BOOL)irqLine {
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return _viaPortHandler.irq_line;
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}
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- (void)setPortAInput:(uint8_t)portAInput {
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_viaPortHandler.port_a_value = portAInput;
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}
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- (uint8_t)portAInput {
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return _viaPortHandler.port_a_value;
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}
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- (void)setPortBInput:(uint8_t)portBInput {
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_viaPortHandler.port_b_value = portBInput;
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}
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- (uint8_t)portBInput {
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return _viaPortHandler.port_b_value;
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}
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- (BOOL)valueForControlLine:(MOS6522BridgeLine)line port:(MOS6522BridgePort)port {
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return _viaPortHandler.control_line_values[port][line];
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}
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@end
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