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Made very first attempt at closing the loop on this. But it's time for work.

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This commit is contained in:
Thomas Harte 2016-08-03 08:16:23 -04:00
parent e15241dc3c
commit 9af9b28baf
4 changed files with 36 additions and 20 deletions
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37
Storage/Disk/DiskDrive.cpp
View File

@ -33,7 +33,7 @@ void DiskDrive::set_expected_bit_length(Time bit_length)
void DiskDrive::set_disk(std::shared_ptr<Disk> disk)
{
_disk = disk;
set_track();
set_track(Time());
}
bool DiskDrive::has_disk()
@ -49,31 +49,30 @@ bool DiskDrive::get_is_track_zero()
void DiskDrive::step(int direction)
{
_head_position = std::max(_head_position + direction, 0);
// TODO: add fractional part to _time_into_track
_time_into_track += get_time_into_next_event();
// TODO: probably a better implementation of the empty track?
// Time offset;
// if(_track)
// {
// Time time_found = _track->seek_to(_time_into_track);
// offset = _time_into_track - time_found;
// }
// else
// {
// offset = _time_into_track;
// }
// TODO: apply offset
set_track();
set_track(_time_into_track);
}
void DiskDrive::set_track()
void DiskDrive::set_track(Time initial_offset)
{
// TODO: accept and apply offset
_track = _disk->get_track_at_position((unsigned int)_head_position);
// TODO: probably a better implementation of the empty track?
Time offset;
if(_track)
{
Time time_found = _track->seek_to(_time_into_track);
offset = _time_into_track - time_found;
_time_into_track = time_found;
}
else
{
offset = _time_into_track;
_time_into_track.set_zero();
}
reset_timer();
get_next_event();
reset_timer_to_offset(offset);
}
void DiskDrive::run_for_cycles(int number_of_cycles)

2
Storage/Disk/DiskDrive.hpp
View File

@ -99,7 +99,7 @@ class DiskDrive: public DigitalPhaseLockedLoop::Delegate, public TimedEventLoop
std::shared_ptr<Track> _track;
int _head_position;
unsigned int _cycles_since_index_hole;
void set_track();
void set_track(Time initial_offset);
inline void get_next_event();
Track::Event _current_event;

12
Storage/TimedEventLoop.cpp
View File

@ -29,6 +29,18 @@ void TimedEventLoop::reset_timer()
_stepper.reset();
}
void TimedEventLoop::reset_timer_to_offset(Time offset)
{
unsigned int common_clock_rate = NumberTheory::least_common_multiple(offset.clock_rate, _event_interval.clock_rate);
_time_into_interval = offset.length * (common_clock_rate / offset.clock_rate);
_event_interval.length *= common_clock_rate / _event_interval.clock_rate;
_event_interval.clock_rate = common_clock_rate;
if(common_clock_rate != _stepper->get_output_rate())
{
_stepper.reset(new SignalProcessing::Stepper(_event_interval.clock_rate, _input_clock_rate));
}
}
void TimedEventLoop::jump_to_next_event()
{
reset_timer();

5
Storage/TimedEventLoop.hpp
View File

@ -66,6 +66,11 @@ namespace Storage {
*/
void reset_timer();
/*!
Sets the amount of time into the current event to @c offset.
*/
void reset_timer_to_offset(Time offset);
/*!
Causes an immediate call to @c process_next_event and a call to @c reset_timer with the
net effect of processing the current event immediately and fast forwarding exactly to the