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A drive with no disk is now happy to spin its motor.

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It'll continue to produce index-hole events, which might not be accurate for 5.25" drives. Research to do.
This commit is contained in:
Thomas Harte 2019-10-26 22:57:05 -04:00
parent 55710ea00e
commit 909685d87d
1 changed files with 37 additions and 25 deletions
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62
Storage/Disk/Drive.cpp
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@ -98,7 +98,7 @@ std::shared_ptr<Track> Drive::step_to(HeadPosition offset) {
HeadPosition old_head_position = head_position_;
head_position_ = std::max(offset, HeadPosition(0));
if(head_position_ != old_head_position) {
if(disk_ && head_position_ != old_head_position) {
track_ = nullptr;
setup_track();
}
@ -178,35 +178,39 @@ void Drive::advance(const Cycles cycles) {
}
void Drive::run_for(const Cycles cycles) {
if(has_disk_ && motor_is_on_) {
Time zero(0);
if(motor_is_on_) {
if(has_disk_) {
Time zero(0);
int number_of_cycles = cycles.as_int();
while(number_of_cycles) {
int cycles_until_next_event = static_cast<int>(get_cycles_until_next_event());
int cycles_to_run_for = std::min(cycles_until_next_event, number_of_cycles);
if(!is_reading_ && cycles_until_bits_written_ > zero) {
int write_cycles_target = cycles_until_bits_written_.get<int>();
if(cycles_until_bits_written_.length % cycles_until_bits_written_.clock_rate) write_cycles_target++;
cycles_to_run_for = std::min(cycles_to_run_for, write_cycles_target);
}
int number_of_cycles = cycles.as_int();
while(number_of_cycles) {
int cycles_until_next_event = static_cast<int>(get_cycles_until_next_event());
int cycles_to_run_for = std::min(cycles_until_next_event, number_of_cycles);
if(!is_reading_ && cycles_until_bits_written_ > zero) {
int write_cycles_target = cycles_until_bits_written_.get<int>();
if(cycles_until_bits_written_.length % cycles_until_bits_written_.clock_rate) write_cycles_target++;
cycles_to_run_for = std::min(cycles_to_run_for, write_cycles_target);
}
number_of_cycles -= cycles_to_run_for;
if(!is_reading_) {
if(cycles_until_bits_written_ > zero) {
Storage::Time cycles_to_run_for_time(cycles_to_run_for);
if(cycles_until_bits_written_ <= cycles_to_run_for_time) {
if(event_delegate_) event_delegate_->process_write_completed();
if(cycles_until_bits_written_ <= cycles_to_run_for_time)
cycles_until_bits_written_.set_zero();
else
number_of_cycles -= cycles_to_run_for;
if(!is_reading_) {
if(cycles_until_bits_written_ > zero) {
Storage::Time cycles_to_run_for_time(cycles_to_run_for);
if(cycles_until_bits_written_ <= cycles_to_run_for_time) {
if(event_delegate_) event_delegate_->process_write_completed();
if(cycles_until_bits_written_ <= cycles_to_run_for_time)
cycles_until_bits_written_.set_zero();
else
cycles_until_bits_written_ -= cycles_to_run_for_time;
} else {
cycles_until_bits_written_ -= cycles_to_run_for_time;
} else {
cycles_until_bits_written_ -= cycles_to_run_for_time;
}
}
}
TimedEventLoop::run_for(Cycles(cycles_to_run_for));
}
TimedEventLoop::run_for(Cycles(cycles_to_run_for));
} else {
TimedEventLoop::run_for(cycles);
}
}
}
@ -214,6 +218,13 @@ void Drive::run_for(const Cycles cycles) {
// MARK: - Track timed event loop
void Drive::get_next_event(float duration_already_passed) {
if(!disk_) {
current_event_.type = Track::Event::IndexHole;
current_event_.length = 1.0f;
set_next_event_time_interval((current_event_.length - duration_already_passed) * rotational_multiplier_);
return;
}
// Grab a new track if not already in possession of one. This will recursively call get_next_event,
// supplying a proper duration_already_passed.
if(!track_) {
@ -322,7 +333,8 @@ void Drive::invalidate_track() {
void Drive::begin_writing(Time bit_length, bool clamp_to_index_hole) {
// Do nothing if already writing.
if(!is_reading_) return;
// TODO: cope properly if there's no disk to write to.
if(!is_reading_ || !disk_) return;
// Get a copy of the track if that hasn't happened yet.
if(!track_) {