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Adds a basic implementation of the non-instantaneous index pulse.

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Thomas Harte 2019-12-24 21:05:17 -05:00
parent dfa6b11737
commit f633cf4c3f
1 changed files with 8 additions and 0 deletions
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8
Storage/Disk/Drive.cpp
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@ -182,6 +182,9 @@ void Drive::advance(const Cycles cycles) {
}
void Drive::run_for(const Cycles cycles) {
// Assumed: the index pulse pulses even if the drive has stopped spinning.
index_pulse_remaining_ = std::max(index_pulse_remaining_ - cycles, Cycles(0));
if(motor_is_on_) {
if(has_disk_) {
Time zero(0);
@ -262,6 +265,11 @@ void Drive::get_next_event(float duration_already_passed) {
current_event_.type = Track::Event::IndexHole;
}
// Begin a 2ms period of holding the index line pulse active if this is an index pulse event.
if(current_event_.type == Track::Event::IndexHole) {
index_pulse_remaining_ = Cycles((get_input_clock_rate() * 2) / 1000);
}
// divide interval, which is in terms of a single rotation of the disk, by rotation speed to
// convert it into revolutions per second; this is achieved by multiplying by rotational_multiplier_
float interval = std::max((current_event_.length - duration_already_passed) * rotational_multiplier_, 0.0f);