Eliminates 6522Base in pursuit of working handshake modes.

Specifically: this means that the places from which the BusHandler may be called are more numerous.

Components/6522/6522.hpp

@@ -71,26 +71,6 @@ class IRQDelegatePortHandler: public PortHandler {
 		Delegate *delegate_ = nullptr;
 };
 
-class MOS6522Base: public MOS6522Storage {
-	public:
-		/// Sets the input value of line @c line on port @c port.
-		void set_control_line_input(Port port, Line line, bool value);
-
-		/// Runs for a specified number of half cycles.
-		void run_for(const HalfCycles half_cycles);
-
-		/// Runs for a specified number of cycles.
-		void run_for(const Cycles cycles);
-
-		/// @returns @c true if the IRQ line is currently active; @c false otherwise.
-		bool get_interrupt_line();
-
-	private:
-		inline void do_phase1();
-		inline void do_phase2();
-		virtual void reevaluate_interrupts() = 0;
-};
-
 /*!
 	Implements a template for emulation of the MOS 6522 Versatile Interface Adaptor ('VIA').
 
@@ -102,7 +82,7 @@ class MOS6522Base: public MOS6522Storage {
 	Consumers should derive their own curiously-recurring-template-pattern subclass,
 	implementing bus communications as required.
 */
-template <class T> class MOS6522: public MOS6522Base {
+template <class T> class MOS6522: public MOS6522Storage {
 	public:
 		MOS6522(T &bus_handler) noexcept : bus_handler_(bus_handler) {}
 		MOS6522(const MOS6522 &) = delete;
@@ -116,7 +96,21 @@ template <class T> class MOS6522: public MOS6522Base {
 		/*! @returns the bus handler. */
 		T &bus_handler();
 
+		/// Sets the input value of line @c line on port @c port.
+		void set_control_line_input(Port port, Line line, bool value);
+
+		/// Runs for a specified number of half cycles.
+		void run_for(const HalfCycles half_cycles);
+
+		/// Runs for a specified number of cycles.
+		void run_for(const Cycles cycles);
+
+		/// @returns @c true if the IRQ line is currently active; @c false otherwise.
+		bool get_interrupt_line();
+
 	private:
+		void do_phase1();
+		void do_phase2();
 		T &bus_handler_;
 
 		uint8_t get_port_input(Port port, uint8_t output_mask, uint8_t output);

Components/6522/Implementation/6522Base.cpp

@@ -1,116 +0,0 @@
-//
-//  6522Base.cpp
-//  Clock Signal
-//
-//  Created by Thomas Harte on 04/09/2017.
-//  Copyright 2017 Thomas Harte. All rights reserved.
-//
-
-#include "../6522.hpp"
-
-using namespace MOS::MOS6522;
-
-void MOS6522Base::set_control_line_input(Port port, Line line, bool value) {
-	switch(line) {
-		case Line::One:
-			if(	value != control_inputs_[port].line_one &&
-				value == !!(registers_.peripheral_control & (port ? 0x10 : 0x01))
-			) {
-				registers_.interrupt_flags |= port ? InterruptFlag::CB1ActiveEdge : InterruptFlag::CA1ActiveEdge;
-				reevaluate_interrupts();
-			}
-			control_inputs_[port].line_one = value;
-		break;
-
-		case Line::Two:
-			// TODO: output modes, but probably elsewhere?
-			if(	value != control_inputs_[port].line_two &&							// i.e. value has changed ...
-				!(registers_.peripheral_control & (port ? 0x80 : 0x08)) &&			// ... and line is input ...
-				value == !!(registers_.peripheral_control & (port ? 0x40 : 0x04))	// ... and it's either high or low, as required
-			) {
-				registers_.interrupt_flags |= port ? InterruptFlag::CB2ActiveEdge : InterruptFlag::CA2ActiveEdge;
-				reevaluate_interrupts();
-			}
-			control_inputs_[port].line_two = value;
-		break;
-	}
-}
-
-void MOS6522Base::do_phase2() {
-	registers_.last_timer[0] = registers_.timer[0];
-	registers_.last_timer[1] = registers_.timer[1];
-
-	if(registers_.timer_needs_reload) {
-		registers_.timer_needs_reload = false;
-		registers_.timer[0] = registers_.timer_latch[0];
-	} else {
-		registers_.timer[0] --;
-	}
-
-	registers_.timer[1] --;
-	if(registers_.next_timer[0] >= 0) {
-		registers_.timer[0] = static_cast<uint16_t>(registers_.next_timer[0]);
-		registers_.next_timer[0] = -1;
-	}
-	if(registers_.next_timer[1] >= 0) {
-		registers_.timer[1] = static_cast<uint16_t>(registers_.next_timer[1]);
-		registers_.next_timer[1] = -1;
-	}
-}
-
-void MOS6522Base::do_phase1() {
-	// IRQ is raised on the half cycle after overflow
-	if((registers_.timer[1] == 0xffff) && !registers_.last_timer[1] && timer_is_running_[1]) {
-		timer_is_running_[1] = false;
-		registers_.interrupt_flags |= InterruptFlag::Timer2;
-		reevaluate_interrupts();
-	}
-
-	if((registers_.timer[0] == 0xffff) && !registers_.last_timer[0] && timer_is_running_[0]) {
-		registers_.interrupt_flags |= InterruptFlag::Timer1;
-		reevaluate_interrupts();
-
-		if(registers_.auxiliary_control&0x40)
-			registers_.timer_needs_reload = true;
-		else
-			timer_is_running_[0] = false;
-	}
-}
-
-/*! Runs for a specified number of half cycles. */
-void MOS6522Base::run_for(const HalfCycles half_cycles) {
-	int number_of_half_cycles = half_cycles.as_int();
-
-	if(is_phase2_) {
-		do_phase2();
-		number_of_half_cycles--;
-	}
-
-	while(number_of_half_cycles >= 2) {
-		do_phase1();
-		do_phase2();
-		number_of_half_cycles -= 2;
-	}
-
-	if(number_of_half_cycles) {
-		do_phase1();
-		is_phase2_ = true;
-	} else {
-		is_phase2_ = false;
-	}
-}
-
-/*! Runs for a specified number of cycles. */
-void MOS6522Base::run_for(const Cycles cycles) {
-	int number_of_cycles = cycles.as_int();
-	while(number_of_cycles--) {
-		do_phase1();
-		do_phase2();
-	}
-}
-
-/*! @returns @c true if the IRQ line is currently active; @c false otherwise. */
-bool MOS6522Base::get_interrupt_line() {
-	uint8_t interrupt_status = registers_.interrupt_flags & registers_.interrupt_enable & 0x7f;
-	return !!interrupt_status;
-}

Components/6522/Implementation/6522Implementation.hpp

@@ -14,26 +14,34 @@ namespace MOS6522 {
 template <typename T> void MOS6522<T>::set_register(int address, uint8_t value) {
 	address &= 0xf;
 	switch(address) {
-		case 0x0:
+		case 0x0:	// Write Port B.
 			registers_.output[1] = value;
-			bus_handler_.set_port_output(Port::B, value, registers_.data_direction[1]);	// TODO: handshake
+			bus_handler_.set_port_output(Port::B, value, registers_.data_direction[1]);
+
+			if(handshake_modes_[0] != HandshakeMode::None) {
+				bus_handler_.set_control_line_output(Port::B, Line::Two, false);
+			}
 
 			registers_.interrupt_flags &= ~(InterruptFlag::CB1ActiveEdge | ((registers_.peripheral_control&0x20) ? 0 : InterruptFlag::CB2ActiveEdge));
 			reevaluate_interrupts();
 		break;
 		case 0xf:
-		case 0x1:
+		case 0x1:	// Write Port A.
 			registers_.output[0] = value;
-			bus_handler_.set_port_output(Port::A, value, registers_.data_direction[0]);	// TODO: handshake
+			bus_handler_.set_port_output(Port::A, value, registers_.data_direction[0]);
+
+			if(handshake_modes_[1] != HandshakeMode::None) {
+				bus_handler_.set_control_line_output(Port::A, Line::Two, false);
+			}
 
 			registers_.interrupt_flags &= ~(InterruptFlag::CA1ActiveEdge | ((registers_.peripheral_control&0x02) ? 0 : InterruptFlag::CB2ActiveEdge));
 			reevaluate_interrupts();
 		break;
 
-		case 0x2:
+		case 0x2:	// Port B direction.
 			registers_.data_direction[1] = value;
 		break;
-		case 0x3:
+		case 0x3:	// Port A direction.
 			registers_.data_direction[0] = value;
 		break;
 
@@ -69,19 +77,36 @@ template <typename T> void MOS6522<T>::set_register(int address, uint8_t value)
 			registers_.peripheral_control = value;
 
 			// TODO: simplify below; trying to avoid improper logging of unimplemented warnings in input mode
-			if(value & 0x08) {
+			handshake_modes_[0] = HandshakeMode::None;
-				switch(value & 0x0e) {
+			switch(value & 0x0e) {
-					default: 	LOG("Unimplemented control CA2 line mode " << int((value >> 1)&7));	break;
+				default: 	LOG("Unimplemented control line CA2 mode " << int((value >> 1)&7));	break;
-					case 0x0c:	bus_handler_.set_control_line_output(Port::A, Line::Two, false);	break;
+
-					case 0x0e:	bus_handler_.set_control_line_output(Port::A, Line::Two, true);		break;
+				case 0x00:	// Negative interrupt input; set CA2 interrupt on negative CA2 transition, clear on access to Port A register.
-				}
+				case 0x02:	// Independent negative interrupt input; set CA2 interrupt on negative transition, don't clear automatically.
+				case 0x04:	// Positive interrupt input; set CA2 interrupt on positive CA2 transition, clear on access to Port A register.
+				case 0x06:	// Independent positive interrupt input; set CA2 interrupt on positive transition, don't clear automatically.
+				break;
+
+				case 0x08:	// Handshake: set CA2 to low on any read or write of Port A; set to high on an active transition of CA1.
+					handshake_modes_[0] = HandshakeMode::Handshake;
+				break;
+
+				case 0x0a:	// Pulse output: CA2 is low for one cycle following a read or write of Port A.
+					handshake_modes_[0] = HandshakeMode::Pulse;
+				break;
+
+				case 0x0c:	// Manual output: CA2 low.
+					bus_handler_.set_control_line_output(Port::A, Line::Two, false);
+				break;
+
+				case 0x0e:	// Manual output: CA2 high.
+					bus_handler_.set_control_line_output(Port::A, Line::Two, true);
+				break;
 			}
-			if(value & 0x80) {
+			switch(value & 0xe0) {
-				switch(value & 0xe0) {
+				default: 	LOG("Unimplemented control line CB2 mode " << int((value >> 5)&7));	break;
-					default: 	LOG("Unimplemented control CB2 line mode " << int((value >> 5)&7));	break;
+				case 0xc0:	bus_handler_.set_control_line_output(Port::B, Line::Two, false);	break;
-					case 0xc0:	bus_handler_.set_control_line_output(Port::B, Line::Two, false);	break;
+				case 0xe0:	bus_handler_.set_control_line_output(Port::B, Line::Two, true);		break;
-					case 0xe0:	bus_handler_.set_control_line_output(Port::B, Line::Two, true);		break;
-				}
 			}
 		break;
 
@@ -162,5 +187,114 @@ template <typename T> void MOS6522<T>::reevaluate_interrupts() {
 	}
 }
 
+template <typename T> void MOS6522<T>::set_control_line_input(Port port, Line line, bool value) {
+	switch(line) {
+		case Line::One:
+			if(	value != control_inputs_[port].line_one &&
+				value == !!(registers_.peripheral_control & (port ? 0x10 : 0x01))
+			) {
+				if(handshake_modes_[port] == HandshakeMode::Handshake) {
+//					bus_handler_
+				}
+
+				registers_.interrupt_flags |= port ? InterruptFlag::CB1ActiveEdge : InterruptFlag::CA1ActiveEdge;
+				reevaluate_interrupts();
+			}
+			control_inputs_[port].line_one = value;
+		break;
+
+		case Line::Two:
+			// TODO: output modes, but probably elsewhere?
+			if(	value != control_inputs_[port].line_two &&							// i.e. value has changed ...
+				!(registers_.peripheral_control & (port ? 0x80 : 0x08)) &&			// ... and line is input ...
+				value == !!(registers_.peripheral_control & (port ? 0x40 : 0x04))	// ... and it's either high or low, as required
+			) {
+				registers_.interrupt_flags |= port ? InterruptFlag::CB2ActiveEdge : InterruptFlag::CA2ActiveEdge;
+				reevaluate_interrupts();
+			}
+			control_inputs_[port].line_two = value;
+		break;
+	}
+}
+
+template <typename T> void MOS6522<T>::do_phase2() {
+	registers_.last_timer[0] = registers_.timer[0];
+	registers_.last_timer[1] = registers_.timer[1];
+
+	if(registers_.timer_needs_reload) {
+		registers_.timer_needs_reload = false;
+		registers_.timer[0] = registers_.timer_latch[0];
+	} else {
+		registers_.timer[0] --;
+	}
+
+	registers_.timer[1] --;
+	if(registers_.next_timer[0] >= 0) {
+		registers_.timer[0] = static_cast<uint16_t>(registers_.next_timer[0]);
+		registers_.next_timer[0] = -1;
+	}
+	if(registers_.next_timer[1] >= 0) {
+		registers_.timer[1] = static_cast<uint16_t>(registers_.next_timer[1]);
+		registers_.next_timer[1] = -1;
+	}
+}
+
+template <typename T> void MOS6522<T>::do_phase1() {
+	// IRQ is raised on the half cycle after overflow
+	if((registers_.timer[1] == 0xffff) && !registers_.last_timer[1] && timer_is_running_[1]) {
+		timer_is_running_[1] = false;
+		registers_.interrupt_flags |= InterruptFlag::Timer2;
+		reevaluate_interrupts();
+	}
+
+	if((registers_.timer[0] == 0xffff) && !registers_.last_timer[0] && timer_is_running_[0]) {
+		registers_.interrupt_flags |= InterruptFlag::Timer1;
+		reevaluate_interrupts();
+
+		if(registers_.auxiliary_control&0x40)
+			registers_.timer_needs_reload = true;
+		else
+			timer_is_running_[0] = false;
+	}
+}
+
+/*! Runs for a specified number of half cycles. */
+template <typename T> void MOS6522<T>::run_for(const HalfCycles half_cycles) {
+	int number_of_half_cycles = half_cycles.as_int();
+
+	if(is_phase2_) {
+		do_phase2();
+		number_of_half_cycles--;
+	}
+
+	while(number_of_half_cycles >= 2) {
+		do_phase1();
+		do_phase2();
+		number_of_half_cycles -= 2;
+	}
+
+	if(number_of_half_cycles) {
+		do_phase1();
+		is_phase2_ = true;
+	} else {
+		is_phase2_ = false;
+	}
+}
+
+/*! Runs for a specified number of cycles. */
+template <typename T> void MOS6522<T>::run_for(const Cycles cycles) {
+	int number_of_cycles = cycles.as_int();
+	while(number_of_cycles--) {
+		do_phase1();
+		do_phase2();
+	}
+}
+
+/*! @returns @c true if the IRQ line is currently active; @c false otherwise. */
+template <typename T> bool MOS6522<T>::get_interrupt_line() {
+	uint8_t interrupt_status = registers_.interrupt_flags & registers_.interrupt_enable & 0x7f;
+	return !!interrupt_status;
+}
+
 }
 }

Components/6522/Implementation/6522Storage.hpp

@@ -21,7 +21,7 @@ class MOS6522Storage {
 
 		// The registers
 		struct Registers {
-			// "A  low  reset  (RES)  input  clears  all  R6522  internal registers to logic 0"
+			// "A low reset (RES) input clears all R6522 internal registers to logic 0"
 			uint8_t output[2] = {0, 0};
 			uint8_t input[2] = {0, 0};
 			uint8_t data_direction[2] = {0, 0};
@@ -43,6 +43,12 @@ class MOS6522Storage {
 			bool line_two = false;
 		} control_inputs_[2];
 
+		enum class HandshakeMode {
+			None,
+			Handshake,
+			Pulse
+		} handshake_modes_[2] = { HandshakeMode::None, HandshakeMode::None };
+
 		bool timer_is_running_[2] = {false, false};
 		bool last_posted_interrupt_status_ = false;
 

OSBindings/Mac/Clock Signal.xcodeproj/project.pbxproj

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@@ -240,7 +239,6 @@
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@@ -958,7 +956,6 @@
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@@ -1417,6 +1414,7 @@
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+		4BDB3D8522833321002D3CEE /* Keyboard.hpp */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.cpp.h; path = Keyboard.hpp; sourceTree = "<group>"; };
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@@ -2244,7 +2242,6 @@
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 			isa = PBXGroup;
 			children = (
-				4B83348B1F5DB99C0097E338 /* 6522Base.cpp */,
 				4B8334891F5DB94B0097E338 /* IRQDelegatePortHandler.cpp */,
 				4B8334871F5DB8410097E338 /* 6522Implementation.hpp */,
 				4B83348E1F5DBA6E0097E338 /* 6522Storage.hpp */,
@@ -3073,6 +3070,7 @@
 				4BCE0059227CFFCA000CA200 /* Macintosh.hpp */,
 				4BD0692B22828A2D00D2A54F /* RealTimeClock.hpp */,
 				4BCE005F227D39AB000CA200 /* Video.hpp */,
+				4BDB3D8522833321002D3CEE /* Keyboard.hpp */,
 			);
 			path = Macintosh;
 			sourceTree = "<group>";
@@ -3871,7 +3869,6 @@
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 				4B055A961FAE85BB0060FFFF /* Commodore.cpp in Sources */,
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-				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 */,