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Provide correct input when one of the tone generators is the interrupt source.

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This commit is contained in:
Thomas Harte 2021-06-29 15:41:08 -04:00
parent 7f08218b28
commit 8ce8fbd977
1 changed files with 15 additions and 1 deletions
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16
Machines/Enterprise/Dave.cpp
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@ -293,9 +293,23 @@ Cycles TimedInterruptSource::get_next_sequence_point() const {
}
uint8_t TimedInterruptSource::get_divider_state() {
bool programmable_flag = false;
switch(rate_) {
case InterruptRate::OnekHz:
case InterruptRate::FiftyHz:
programmable_flag = programmable_level_;
break;
case InterruptRate::ToneGenerator0:
programmable_flag = channels_[0].level;
break;
case InterruptRate::ToneGenerator1:
programmable_flag = channels_[1].level;
break;
}
// one_hz_offset_ counts downwards, so when it crosses the halfway mark
// it enters the high part of its wave.
return
(one_hz_offset_ < half_clock_rate ? 0x4 : 0x0) |
(programmable_level_ ? 0x1 : 0x0);
(programmable_flag ? 0x1 : 0x0);
}