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Improves and corrects 6522 header documentation.

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This commit is contained in:
Thomas Harte 2017-09-04 14:32:34 -04:00
parent 24b3faa427
commit 450712f39c
1 changed files with 22 additions and 6 deletions
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28
Components/6522/6522.hpp
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@ -30,26 +30,41 @@ enum Line {
Two = 1
};
/*!
Provides the mechanism for just-int-time communication from a 6522; the normal use case is to compose a
6522 and a subclass of PortHandler in order to reproduce a 6522 and its original bus wiring.
*/
class PortHandler {
public:
/// Requests the current input value of @c port from the port handler.
uint8_t get_port_input(Port port) { return 0xff; }
/// Sets the current output value of @c port and provides @c direction_mask, indicating which pins are marked as output.
void set_port_output(Port port, uint8_t value, uint8_t direction_mask) {}
/// Sets the current logical output level for line @c line on port @c port.
void set_control_line_output(Port port, Line line, bool value) {}
/// Sets the current logical value of the interrupt line.
void set_interrupt_status(bool status) {}
};
/*!
Provided for optional composition with @c MOS6522, @c MOS6522IRQDelegate provides for a delegate
that will receive IRQ line change notifications.
Provided as an optional alternative base to @c PortHandler for port handlers; via the delegate pattern adds
a virtual level of indirection for receiving changes to the interrupt line.
*/
class IRQDelegatePortHandler: public PortHandler {
public:
class Delegate {
public:
virtual void mos6522_did_change_interrupt_status(void *mos6522) = 0;
/// Indicates that the interrupt status has changed for the IRQDelegatePortHandler provided.
virtual void mos6522_did_change_interrupt_status(void *irq_delegate) = 0;
};
/// Sets the delegate that will receive notification of changes in the interrupt line.
void set_interrupt_delegate(Delegate *delegate);
/// Overrides PortHandler::set_interrupt_status, notifying the delegate if one is set.
void set_interrupt_status(bool new_status);
private:
@ -58,15 +73,16 @@ class IRQDelegatePortHandler: public PortHandler {
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. */
/// Runs for a specified number of half cycles.
void run_for(const HalfCycles half_cycles);
/*! Runs for a specified number of 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. */
/// @returns @c true if the IRQ line is currently active; @c false otherwise.
bool get_interrupt_line();
private: