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Implements the 1Hz interrupt.

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This commit is contained in:
Thomas Harte 2021-06-27 21:47:21 -04:00
parent b5312b9ba0
commit e4a650aaff
3 changed files with 16 additions and 4 deletions
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12
Machines/Enterprise/Dave.cpp
View File

@ -220,9 +220,17 @@ void TimedInterruptSource::write(uint16_t address, uint8_t value) {
}
void TimedInterruptSource::run_for(Cycles cycles) {
(void)cycles;
// Update the 1Hz interrupt.
one_hz_offset_ -= cycles;
if(one_hz_offset_ <= Cycles(0)) {
interrupts_ |= uint8_t(Interrupt::OneHz);
one_hz_offset_ += clock_rate;
}
// TODO: update the programmable-frequency interrupt.
}
Cycles TimedInterruptSource::get_next_sequence_point() const {
return Cycles::max();
// TODO: support the programmable-frequency interrupt.
return one_hz_offset_;
}

4
Machines/Enterprise/Dave.hpp
View File

@ -130,6 +130,10 @@ class TimedInterruptSource {
private:
uint8_t interrupts_ = 0;
static constexpr Cycles clock_rate{250000};
Cycles one_hz_offset_ = clock_rate;
enum class InterruptRate {
OnekHz,
FiftyHz,

4
Machines/Enterprise/Enterprise.cpp
View File

@ -400,7 +400,7 @@ template <bool has_disk_controller> class ConcreteMachine:
interrupt_state_ &= ~*cycle.value;
update_interrupts();
if(interrupt_mask_ & 0x45) {
if(interrupt_mask_ & 0x41) {
printf("Unimplemented interrupts requested: %02x\n", interrupt_mask_ & 0x45);
}
break;
@ -412,7 +412,7 @@ template <bool has_disk_controller> class ConcreteMachine:
printf("TODO: printer output %02x\n", *cycle.value);
break;
case 0xbf:
printf("TODO: Dave sysconfig %02x\n", *cycle.value);
// TODO: onboard RAM, Dave 8/12Mhz select.
switch((*cycle.value >> 2)&3) {
default: wait_mode_ = WaitMode::None; break;
case 0: wait_mode_ = WaitMode::OnAllAccesses; break;