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Made a hasty attempt to implement CA1 and CB1 input as a potential source of interrupts.

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This commit is contained in:
Thomas Harte 2016-06-26 16:32:27 -04:00
parent d5e50f5ea0
commit 066db59773
1 changed files with 32 additions and 2 deletions
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34
Components/6522/6522.hpp
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@ -43,6 +43,11 @@ template <class T> class MOS6522 {
B = 1
};
enum Line {
One = 0,
Two = 1
};
/*! Sets a register value. */
inline void set_register(int address, uint8_t value)
{
@ -98,7 +103,10 @@ template <class T> class MOS6522 {
// Control
case 0xb: _registers.auxiliary_control = value; break;
case 0xc: _registers.peripheral_control = value; break;
case 0xc:
_registers.peripheral_control = value;
printf("Peripheral control %02x\n", value);
break;
// Interrupt control
case 0xd:
@ -111,6 +119,7 @@ template <class T> class MOS6522 {
else
_registers.interrupt_enable &= ~value;
reevaluate_interrupts();
printf("Interrupt mask -> %02x\n", _registers.interrupt_enable);
break;
}
}
@ -157,8 +166,24 @@ template <class T> class MOS6522 {
return 0xff;
}
inline void set_control_line_input(Port port, int line, bool value)
inline void 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();
}
break;
case Line::Two:
// TODO
break;
}
}
/*!
@ -274,6 +299,11 @@ template <class T> class MOS6522 {
last_timer{0, 0}, timer_needs_reload(false) {}
} _registers;
// control state
struct {
bool line_one, line_two;
} _control_inputs[2];
// Internal state other than the registers
bool _timer_is_running[2];
};