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https://github.com/TomHarte/CLK.git
synced 2025-01-23 11:30:24 +00:00
Eliminates 6522Base in pursuit of working handshake modes.
Specifically: this means that the places from which the BusHandler may be called are more numerous.
This commit is contained in:
Thomas Harte
parent
7b466e6d0a
commit
254132b83d
@ -71,26 +71,6 @@ class IRQDelegatePortHandler: public PortHandler {
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Delegate *delegate_ = nullptr;
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};
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class MOS6522Base: public MOS6522Storage {
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public:
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/// Sets the input value of line @c line on port @c port.
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void set_control_line_input(Port port, Line line, bool value);
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/// Runs for a specified number of half cycles.
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void run_for(const HalfCycles half_cycles);
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/// Runs for a specified number of cycles.
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void run_for(const Cycles cycles);
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/// @returns @c true if the IRQ line is currently active; @c false otherwise.
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bool get_interrupt_line();
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private:
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inline void do_phase1();
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inline void do_phase2();
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virtual void reevaluate_interrupts() = 0;
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};
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/*!
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Implements a template for emulation of the MOS 6522 Versatile Interface Adaptor ('VIA').
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@ -102,7 +82,7 @@ class MOS6522Base: public MOS6522Storage {
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Consumers should derive their own curiously-recurring-template-pattern subclass,
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implementing bus communications as required.
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*/
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template <class T> class MOS6522: public MOS6522Base {
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template <class T> class MOS6522: public MOS6522Storage {
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public:
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MOS6522(T &bus_handler) noexcept : bus_handler_(bus_handler) {}
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MOS6522(const MOS6522 &) = delete;
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@ -116,7 +96,21 @@ template <class T> class MOS6522: public MOS6522Base {
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/*! @returns the bus handler. */
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T &bus_handler();
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/// Sets the input value of line @c line on port @c port.
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void set_control_line_input(Port port, Line line, bool value);
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/// Runs for a specified number of half cycles.
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void run_for(const HalfCycles half_cycles);
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/// Runs for a specified number of cycles.
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void run_for(const Cycles cycles);
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/// @returns @c true if the IRQ line is currently active; @c false otherwise.
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bool get_interrupt_line();
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private:
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void do_phase1();
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void do_phase2();
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T &bus_handler_;
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uint8_t get_port_input(Port port, uint8_t output_mask, uint8_t output);
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@ -1,116 +0,0 @@
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//
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// 6522Base.cpp
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// Clock Signal
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//
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// Created by Thomas Harte on 04/09/2017.
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// Copyright 2017 Thomas Harte. All rights reserved.
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//
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#include "../6522.hpp"
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using namespace MOS::MOS6522;
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void MOS6522Base::set_control_line_input(Port port, Line line, bool value) {
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switch(line) {
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case Line::One:
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if( value != control_inputs_[port].line_one &&
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value == !!(registers_.peripheral_control & (port ? 0x10 : 0x01))
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) {
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registers_.interrupt_flags |= port ? InterruptFlag::CB1ActiveEdge : InterruptFlag::CA1ActiveEdge;
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reevaluate_interrupts();
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}
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control_inputs_[port].line_one = value;
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break;
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case Line::Two:
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// TODO: output modes, but probably elsewhere?
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if( value != control_inputs_[port].line_two && // i.e. value has changed ...
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!(registers_.peripheral_control & (port ? 0x80 : 0x08)) && // ... and line is input ...
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value == !!(registers_.peripheral_control & (port ? 0x40 : 0x04)) // ... and it's either high or low, as required
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) {
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registers_.interrupt_flags |= port ? InterruptFlag::CB2ActiveEdge : InterruptFlag::CA2ActiveEdge;
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reevaluate_interrupts();
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}
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control_inputs_[port].line_two = value;
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break;
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}
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}
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void MOS6522Base::do_phase2() {
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registers_.last_timer[0] = registers_.timer[0];
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registers_.last_timer[1] = registers_.timer[1];
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if(registers_.timer_needs_reload) {
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registers_.timer_needs_reload = false;
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registers_.timer[0] = registers_.timer_latch[0];
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} else {
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registers_.timer[0] --;
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}
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registers_.timer[1] --;
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if(registers_.next_timer[0] >= 0) {
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registers_.timer[0] = static_cast<uint16_t>(registers_.next_timer[0]);
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registers_.next_timer[0] = -1;
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}
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if(registers_.next_timer[1] >= 0) {
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registers_.timer[1] = static_cast<uint16_t>(registers_.next_timer[1]);
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registers_.next_timer[1] = -1;
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}
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}
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void MOS6522Base::do_phase1() {
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// IRQ is raised on the half cycle after overflow
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if((registers_.timer[1] == 0xffff) && !registers_.last_timer[1] && timer_is_running_[1]) {
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timer_is_running_[1] = false;
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registers_.interrupt_flags |= InterruptFlag::Timer2;
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reevaluate_interrupts();
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}
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if((registers_.timer[0] == 0xffff) && !registers_.last_timer[0] && timer_is_running_[0]) {
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registers_.interrupt_flags |= InterruptFlag::Timer1;
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reevaluate_interrupts();
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if(registers_.auxiliary_control&0x40)
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registers_.timer_needs_reload = true;
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else
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timer_is_running_[0] = false;
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}
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}
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/*! Runs for a specified number of half cycles. */
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void MOS6522Base::run_for(const HalfCycles half_cycles) {
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int number_of_half_cycles = half_cycles.as_int();
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if(is_phase2_) {
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do_phase2();
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number_of_half_cycles--;
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}
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while(number_of_half_cycles >= 2) {
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do_phase1();
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do_phase2();
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number_of_half_cycles -= 2;
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}
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if(number_of_half_cycles) {
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do_phase1();
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is_phase2_ = true;
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} else {
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is_phase2_ = false;
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}
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}
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/*! Runs for a specified number of cycles. */
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void MOS6522Base::run_for(const Cycles cycles) {
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int number_of_cycles = cycles.as_int();
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while(number_of_cycles--) {
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do_phase1();
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do_phase2();
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}
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}
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/*! @returns @c true if the IRQ line is currently active; @c false otherwise. */
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bool MOS6522Base::get_interrupt_line() {
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uint8_t interrupt_status = registers_.interrupt_flags & registers_.interrupt_enable & 0x7f;
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return !!interrupt_status;
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}
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@ -14,26 +14,34 @@ namespace MOS6522 {
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template <typename T> void MOS6522<T>::set_register(int address, uint8_t value) {
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address &= 0xf;
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switch(address) {
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case 0x0:
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case 0x0: // Write Port B.
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registers_.output[1] = value;
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bus_handler_.set_port_output(Port::B, value, registers_.data_direction[1]); // TODO: handshake
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bus_handler_.set_port_output(Port::B, value, registers_.data_direction[1]);
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if(handshake_modes_[0] != HandshakeMode::None) {
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bus_handler_.set_control_line_output(Port::B, Line::Two, false);
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}
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registers_.interrupt_flags &= ~(InterruptFlag::CB1ActiveEdge | ((registers_.peripheral_control&0x20) ? 0 : InterruptFlag::CB2ActiveEdge));
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reevaluate_interrupts();
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break;
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case 0xf:
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case 0x1:
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case 0x1: // Write Port A.
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registers_.output[0] = value;
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bus_handler_.set_port_output(Port::A, value, registers_.data_direction[0]); // TODO: handshake
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bus_handler_.set_port_output(Port::A, value, registers_.data_direction[0]);
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if(handshake_modes_[1] != HandshakeMode::None) {
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bus_handler_.set_control_line_output(Port::A, Line::Two, false);
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}
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registers_.interrupt_flags &= ~(InterruptFlag::CA1ActiveEdge | ((registers_.peripheral_control&0x02) ? 0 : InterruptFlag::CB2ActiveEdge));
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reevaluate_interrupts();
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break;
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case 0x2:
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case 0x2: // Port B direction.
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registers_.data_direction[1] = value;
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break;
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case 0x3:
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case 0x3: // Port A direction.
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registers_.data_direction[0] = value;
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break;
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@ -69,19 +77,36 @@ template <typename T> void MOS6522<T>::set_register(int address, uint8_t value)
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registers_.peripheral_control = value;
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// TODO: simplify below; trying to avoid improper logging of unimplemented warnings in input mode
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if(value & 0x08) {
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switch(value & 0x0e) {
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default: LOG("Unimplemented control CA2 line mode " << int((value >> 1)&7)); break;
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case 0x0c: bus_handler_.set_control_line_output(Port::A, Line::Two, false); break;
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case 0x0e: bus_handler_.set_control_line_output(Port::A, Line::Two, true); break;
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}
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handshake_modes_[0] = HandshakeMode::None;
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switch(value & 0x0e) {
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default: LOG("Unimplemented control line CA2 mode " << int((value >> 1)&7)); break;
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case 0x00: // Negative interrupt input; set CA2 interrupt on negative CA2 transition, clear on access to Port A register.
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case 0x02: // Independent negative interrupt input; set CA2 interrupt on negative transition, don't clear automatically.
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case 0x04: // Positive interrupt input; set CA2 interrupt on positive CA2 transition, clear on access to Port A register.
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case 0x06: // Independent positive interrupt input; set CA2 interrupt on positive transition, don't clear automatically.
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break;
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case 0x08: // Handshake: set CA2 to low on any read or write of Port A; set to high on an active transition of CA1.
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handshake_modes_[0] = HandshakeMode::Handshake;
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break;
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case 0x0a: // Pulse output: CA2 is low for one cycle following a read or write of Port A.
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handshake_modes_[0] = HandshakeMode::Pulse;
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break;
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case 0x0c: // Manual output: CA2 low.
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bus_handler_.set_control_line_output(Port::A, Line::Two, false);
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break;
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case 0x0e: // Manual output: CA2 high.
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bus_handler_.set_control_line_output(Port::A, Line::Two, true);
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break;
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}
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if(value & 0x80) {
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switch(value & 0xe0) {
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default: LOG("Unimplemented control CB2 line mode " << int((value >> 5)&7)); break;
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case 0xc0: bus_handler_.set_control_line_output(Port::B, Line::Two, false); break;
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case 0xe0: bus_handler_.set_control_line_output(Port::B, Line::Two, true); break;
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}
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switch(value & 0xe0) {
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default: LOG("Unimplemented control line CB2 mode " << int((value >> 5)&7)); break;
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case 0xc0: bus_handler_.set_control_line_output(Port::B, Line::Two, false); break;
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case 0xe0: bus_handler_.set_control_line_output(Port::B, Line::Two, true); break;
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}
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break;
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@ -162,5 +187,114 @@ template <typename T> void MOS6522<T>::reevaluate_interrupts() {
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}
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}
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template <typename T> void MOS6522<T>::set_control_line_input(Port port, Line line, bool value) {
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switch(line) {
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case Line::One:
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if( value != control_inputs_[port].line_one &&
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value == !!(registers_.peripheral_control & (port ? 0x10 : 0x01))
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) {
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if(handshake_modes_[port] == HandshakeMode::Handshake) {
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// bus_handler_
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}
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registers_.interrupt_flags |= port ? InterruptFlag::CB1ActiveEdge : InterruptFlag::CA1ActiveEdge;
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reevaluate_interrupts();
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}
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control_inputs_[port].line_one = value;
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break;
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case Line::Two:
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// TODO: output modes, but probably elsewhere?
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if( value != control_inputs_[port].line_two && // i.e. value has changed ...
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!(registers_.peripheral_control & (port ? 0x80 : 0x08)) && // ... and line is input ...
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value == !!(registers_.peripheral_control & (port ? 0x40 : 0x04)) // ... and it's either high or low, as required
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) {
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registers_.interrupt_flags |= port ? InterruptFlag::CB2ActiveEdge : InterruptFlag::CA2ActiveEdge;
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reevaluate_interrupts();
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}
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control_inputs_[port].line_two = value;
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break;
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}
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}
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template <typename T> void MOS6522<T>::do_phase2() {
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registers_.last_timer[0] = registers_.timer[0];
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registers_.last_timer[1] = registers_.timer[1];
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if(registers_.timer_needs_reload) {
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registers_.timer_needs_reload = false;
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registers_.timer[0] = registers_.timer_latch[0];
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} else {
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registers_.timer[0] --;
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}
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registers_.timer[1] --;
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if(registers_.next_timer[0] >= 0) {
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registers_.timer[0] = static_cast<uint16_t>(registers_.next_timer[0]);
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registers_.next_timer[0] = -1;
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}
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if(registers_.next_timer[1] >= 0) {
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registers_.timer[1] = static_cast<uint16_t>(registers_.next_timer[1]);
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registers_.next_timer[1] = -1;
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}
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}
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template <typename T> void MOS6522<T>::do_phase1() {
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// IRQ is raised on the half cycle after overflow
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if((registers_.timer[1] == 0xffff) && !registers_.last_timer[1] && timer_is_running_[1]) {
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timer_is_running_[1] = false;
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registers_.interrupt_flags |= InterruptFlag::Timer2;
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reevaluate_interrupts();
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}
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if((registers_.timer[0] == 0xffff) && !registers_.last_timer[0] && timer_is_running_[0]) {
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registers_.interrupt_flags |= InterruptFlag::Timer1;
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reevaluate_interrupts();
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if(registers_.auxiliary_control&0x40)
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registers_.timer_needs_reload = true;
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else
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timer_is_running_[0] = false;
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}
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}
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/*! Runs for a specified number of half cycles. */
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template <typename T> void MOS6522<T>::run_for(const HalfCycles half_cycles) {
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int number_of_half_cycles = half_cycles.as_int();
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if(is_phase2_) {
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do_phase2();
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number_of_half_cycles--;
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}
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while(number_of_half_cycles >= 2) {
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do_phase1();
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do_phase2();
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number_of_half_cycles -= 2;
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}
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if(number_of_half_cycles) {
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do_phase1();
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is_phase2_ = true;
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} else {
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is_phase2_ = false;
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}
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}
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/*! Runs for a specified number of cycles. */
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template <typename T> void MOS6522<T>::run_for(const Cycles cycles) {
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int number_of_cycles = cycles.as_int();
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while(number_of_cycles--) {
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do_phase1();
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do_phase2();
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}
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}
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/*! @returns @c true if the IRQ line is currently active; @c false otherwise. */
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template <typename T> bool MOS6522<T>::get_interrupt_line() {
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uint8_t interrupt_status = registers_.interrupt_flags & registers_.interrupt_enable & 0x7f;
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return !!interrupt_status;
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}
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}
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}
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@ -21,7 +21,7 @@ class MOS6522Storage {
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// The registers
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struct Registers {
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// "A low reset (RES) input clears all R6522 internal registers to logic 0"
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// "A low reset (RES) input clears all R6522 internal registers to logic 0"
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uint8_t output[2] = {0, 0};
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uint8_t input[2] = {0, 0};
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uint8_t data_direction[2] = {0, 0};
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@ -43,6 +43,12 @@ class MOS6522Storage {
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bool line_two = false;
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} control_inputs_[2];
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enum class HandshakeMode {
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None,
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Handshake,
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Pulse
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} handshake_modes_[2] = { HandshakeMode::None, HandshakeMode::None };
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bool timer_is_running_[2] = {false, false};
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bool last_posted_interrupt_status_ = false;
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@ -93,7 +93,6 @@
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@ -240,7 +239,6 @@
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4B83348A1F5DB94B0097E338 /* IRQDelegatePortHandler.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 4B8334891F5DB94B0097E338 /* IRQDelegatePortHandler.cpp */; };
|
||||
4B83348C1F5DB99C0097E338 /* 6522Base.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 4B83348B1F5DB99C0097E338 /* 6522Base.cpp */; };
|
||||
4B8334951F5E25B60097E338 /* C1540.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 4B8334941F5E25B60097E338 /* C1540.cpp */; };
|
||||
4B85322D227793CB00F26553 /* etos192uk.trace.txt.gz in Resources */ = {isa = PBXBuildFile; fileRef = 4B85322C227793CA00F26553 /* etos192uk.trace.txt.gz */; };
|
||||
4B85322F2277ABDE00F26553 /* tos100.trace.txt.gz in Resources */ = {isa = PBXBuildFile; fileRef = 4B85322E2277ABDD00F26553 /* tos100.trace.txt.gz */; };
|
||||
@ -958,7 +956,6 @@
|
||||
4B8334851F5DA3780097E338 /* 6502Storage.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = 6502Storage.cpp; sourceTree = "<group>"; };
|
||||
4B8334871F5DB8410097E338 /* 6522Implementation.hpp */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.cpp.h; name = 6522Implementation.hpp; path = Implementation/6522Implementation.hpp; sourceTree = "<group>"; };
|
||||
4B8334891F5DB94B0097E338 /* IRQDelegatePortHandler.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; name = IRQDelegatePortHandler.cpp; path = Implementation/IRQDelegatePortHandler.cpp; sourceTree = "<group>"; };
|
||||
4B83348B1F5DB99C0097E338 /* 6522Base.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; name = 6522Base.cpp; path = Implementation/6522Base.cpp; sourceTree = "<group>"; };
|
||||
4B83348E1F5DBA6E0097E338 /* 6522Storage.hpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.h; name = 6522Storage.hpp; path = Implementation/6522Storage.hpp; sourceTree = "<group>"; };
|
||||
4B8334911F5E24FF0097E338 /* C1540Base.hpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.h; name = C1540Base.hpp; path = Implementation/C1540Base.hpp; sourceTree = "<group>"; };
|
||||
4B8334941F5E25B60097E338 /* C1540.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; name = C1540.cpp; path = Implementation/C1540.cpp; sourceTree = "<group>"; };
|
||||
@ -1417,6 +1414,7 @@
|
||||
4BD67DCE209BF27B00AB2146 /* Encoder.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = Encoder.cpp; sourceTree = "<group>"; };
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||||
4BD67DCF209BF27B00AB2146 /* Encoder.hpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.h; path = Encoder.hpp; sourceTree = "<group>"; };
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||||
4BD9137D1F311BC5009BCF85 /* i8255.hpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.h; name = i8255.hpp; path = 8255/i8255.hpp; sourceTree = "<group>"; };
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4BDB3D8522833321002D3CEE /* Keyboard.hpp */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.cpp.h; path = Keyboard.hpp; sourceTree = "<group>"; };
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4BDCC5F81FB27A5E001220C5 /* ROMMachine.hpp */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.cpp.h; path = ROMMachine.hpp; sourceTree = "<group>"; };
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4BDDBA981EF3451200347E61 /* Z80MachineCycleTests.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = Z80MachineCycleTests.swift; sourceTree = "<group>"; };
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||||
4BE3231220532443006EF799 /* Target.hpp */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.cpp.h; path = Target.hpp; sourceTree = "<group>"; };
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||||
@ -2244,7 +2242,6 @@
|
||||
4B8334881F5DB8470097E338 /* Implementation */ = {
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isa = PBXGroup;
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children = (
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4B83348B1F5DB99C0097E338 /* 6522Base.cpp */,
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4B8334891F5DB94B0097E338 /* IRQDelegatePortHandler.cpp */,
|
||||
4B8334871F5DB8410097E338 /* 6522Implementation.hpp */,
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4B83348E1F5DBA6E0097E338 /* 6522Storage.hpp */,
|
||||
@ -3073,6 +3070,7 @@
|
||||
4BCE0059227CFFCA000CA200 /* Macintosh.hpp */,
|
||||
4BD0692B22828A2D00D2A54F /* RealTimeClock.hpp */,
|
||||
4BCE005F227D39AB000CA200 /* Video.hpp */,
|
||||
4BDB3D8522833321002D3CEE /* Keyboard.hpp */,
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||||
);
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||||
path = Macintosh;
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||||
sourceTree = "<group>";
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@ -3871,7 +3869,6 @@
|
||||
4BD424E82193B5830097291A /* Rectangle.cpp in Sources */,
|
||||
4B055A961FAE85BB0060FFFF /* Commodore.cpp in Sources */,
|
||||
4B0333B02094081A0050B93D /* AppleDSK.cpp in Sources */,
|
||||
4B055ADE1FAE9B4C0060FFFF /* 6522Base.cpp in Sources */,
|
||||
4B894535201967B4007DE474 /* AddressMapper.cpp in Sources */,
|
||||
4B055AD41FAE9B0B0060FFFF /* Oric.cpp in Sources */,
|
||||
4B055A921FAE85B50060FFFF /* PRG.cpp in Sources */,
|
||||
@ -4037,7 +4034,6 @@
|
||||
4B3051301D98ACC600B4FED8 /* Plus3.cpp in Sources */,
|
||||
4B30512D1D989E2200B4FED8 /* Drive.cpp in Sources */,
|
||||
4BCE005D227D30CC000CA200 /* MemoryPacker.cpp in Sources */,
|
||||
4B83348C1F5DB99C0097E338 /* 6522Base.cpp in Sources */,
|
||||
4BCE0051227CE8CA000CA200 /* Video.cpp in Sources */,
|
||||
4B894536201967B4007DE474 /* Z80.cpp in Sources */,
|
||||
4BCA6CC81D9DD9F000C2D7B2 /* CommodoreROM.cpp in Sources */,
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user