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89 lines
2.1 KiB
C++
89 lines
2.1 KiB
C++
//
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// 6526Implementation.hpp
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// Clock Signal
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//
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// Created by Thomas Harte on 18/07/2021.
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// Copyright © 2021 Thomas Harte. All rights reserved.
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//
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#ifndef _526Implementation_h
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#define _526Implementation_h
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#include <cassert>
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#include <cstdio>
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namespace MOS {
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namespace MOS6526 {
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template <typename BusHandlerT, Personality personality>
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template <int port> void MOS6526<BusHandlerT, personality>::set_port_output() {
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const uint8_t output = registers_.output[port] | (~registers_.data_direction[port]);
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port_handler_.set_port_output(Port(port), output);
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}
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template <typename BusHandlerT, Personality personality>
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template <int port> uint8_t MOS6526<BusHandlerT, personality>::get_port_input() {
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const uint8_t input = port_handler_.get_port_input(Port(port));
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return (input & ~registers_.data_direction[port]) | (registers_.output[port] & registers_.data_direction[port]);
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}
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template <typename BusHandlerT, Personality personality>
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void MOS6526<BusHandlerT, personality>::write(int address, uint8_t value) {
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address &= 0xf;
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switch(address) {
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// Port output.
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case 0:
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registers_.output[0] = value;
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set_port_output<0>();
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break;
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case 1:
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registers_.output[1] = value;
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set_port_output<1>();
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break;
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// Port direction.
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case 2:
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registers_.data_direction[0] = value;
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set_port_output<0>();
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break;
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case 3:
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registers_.data_direction[1] = value;
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set_port_output<1>();
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break;
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default:
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printf("Unhandled 6526 write: %02x to %d\n", value, address);
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assert(false);
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break;
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}
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}
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template <typename BusHandlerT, Personality personality>
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uint8_t MOS6526<BusHandlerT, personality>::read(int address) {
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address &= 0xf;
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switch(address) {
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case 0: return get_port_input<0>();
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case 1: return get_port_input<1>();
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case 2: case 3:
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return registers_.data_direction[address - 2];
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break;
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default:
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printf("Unhandled 6526 read from %d\n", address);
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assert(false);
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break;
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}
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return 0xff;
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}
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template <typename BusHandlerT, Personality personality>
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void MOS6526<BusHandlerT, personality>::run_for(const HalfCycles half_cycles) {
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(void)half_cycles;
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}
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}
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}
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#endif /* _526Implementation_h */
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