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Attempts to implement interrupt latches and clears.

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This commit is contained in:
Thomas Harte 2021-06-18 22:59:41 -04:00
parent 9a0022cfcb
commit 6af6f21868
1 changed files with 22 additions and 4 deletions
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26
Machines/Enterprise/Enterprise.cpp
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@ -106,7 +106,7 @@ class ConcreteMachine:
const auto nick = nick_.last_valid();
const bool nick_interrupt_line = nick->get_interrupt_line();
if(nick_interrupt_line && !previous_nick_interrupt_line_) {
// TODO: apply interrupt.
set_interrupt(Interrupt::Nick, nick_.last_sequence_point_overrun());
}
previous_nick_interrupt_line_ = nick_interrupt_line;
}
@ -127,8 +127,7 @@ class ConcreteMachine:
case 0xb3: *cycle.value = pages_[3]; break;
case 0xb4:
printf("TODO: interrupt enable/reset read\n");
*cycle.value = 0xff;
*cycle.value = interrupt_mask_ | interrupt_state_;
break;
case 0xb5:
if(active_key_line_ < key_lines_.size()) {
@ -167,7 +166,9 @@ class ConcreteMachine:
break;
case 0xb4:
printf("TODO: interrupt enable/reset write %02x\n", *cycle.value);
interrupt_mask_ = *cycle.value & 0x55;
interrupt_state_ &= ~*cycle.value;
update_interrupts();
break;
case 0xb5:
active_key_line_ = *cycle.value & 0xf;
@ -276,6 +277,23 @@ class ConcreteMachine:
key_lines_.fill(0xff);
}
// MARK: - Interrupts
// TODO: include an error.
enum class Interrupt: uint8_t {
Nick = 0x20
};
uint8_t interrupt_mask_ = 0x00, interrupt_state_ = 0x00;
void set_interrupt(Interrupt mask, HalfCycles offset = HalfCycles(0)) {
interrupt_state_ |= uint8_t(mask);
update_interrupts(offset);
}
void update_interrupts(HalfCycles offset = HalfCycles(0)) {
z80_.set_interrupt_line((interrupt_state_ >> 1) & interrupt_mask_, offset);
}
// MARK: - Chips.
CPU::Z80::Processor<ConcreteMachine, false, false> z80_;
JustInTimeActor<Nick, HalfCycles, 444923, 125000> nick_;