130 Commits

Author	SHA1	Message	Date
Thomas Harte	0490a47058	Worked on the all-around framework for decoding sectors back from tracks when closing down a file. Hit the wall that the parser is more observant of CRCs than the WD. No, really. So I guess I have to stop avoiding that whole issue.	2016-12-26 14:24:33 -05:00
Thomas Harte	742c5df367	With lots of logging arising temporarily, fixed bug whereby conversion to a patched track would lead to holding a track with a distinct measure of time, leading to improperly-placed patches.	2016-12-25 22:00:39 -05:00
Thomas Harte	b538ee5bd8	Fixed discovery of correct active period and setting of track time, when seeking.	2016-12-25 21:32:50 -05:00
Thomas Harte	a6d038cad9	Eliminated special case that doesn't seek properly and isn't needed. Added TODO.	2016-12-25 21:32:14 -05:00
Thomas Harte	4fca30b81f	Made the Plus 3 less chatty, documented invalidate_track.	2016-12-25 21:06:58 -05:00
Thomas Harte	26710c988d	Modified SSD to ensure a fully-formatted surface is represented even if no track data is in the source file. This corrects the controller's sense of write success.	2016-12-25 20:40:06 -05:00
Thomas Harte	acc35885cd	Attempted to reduce track invalidations.	2016-12-25 20:38:25 -05:00
Thomas Harte	beaa868079	Factored the MFM parser out into encodings.	2016-12-25 20:00:57 -05:00
Thomas Harte	1349e85d83	[Mostly] fixed track write-back.	2016-12-25 19:19:22 -05:00
Thomas Harte	007c13ec16	Fixed: cycles_per_bit_ isn't a function of the rotational multiplier, it's absolute. Also made sure that exactly hitting the end of a bit counts.	2016-12-25 16:35:39 -05:00
Thomas Harte	98be6ede45	Shuffled a little to reduce risk of overflow, ensured writing is a loop, still seem to be writing too quickly for some reason.	2016-12-25 16:13:05 -05:00
Thomas Harte	d2ad2c756e	Added enough shovelling to write rubbish for an entire sector.	2016-12-25 15:46:49 -05:00
Thomas Harte	ec55a25620	It makes sense to simplify these ahead of time.	2016-12-25 12:32:25 -05:00
Thomas Harte	aceb7e3b6b	Started implementing write sector on the 1770, immediately deciding it would be useful to have a callback for end-of-queued-data-written from disk controller. So had a go at implementing that, naively. More investigation required.	2016-12-25 12:31:38 -05:00
Thomas Harte	901f19f89c	Added enough stuff that SSDs attached to a 1770 will now reach the entry point for writing.	2016-12-25 09:46:12 -05:00
Thomas Harte	9d555c4a02	Let's try just declining to pump the PLL while in write mode. Added documentation to explain.	2016-12-25 09:19:18 -05:00
Thomas Harte	b57038edc5	Actually, at least index holes will still be receivable while writing, so this wasn't entirely correct. Probably best to leave it in.	2016-12-25 09:16:09 -05:00
Thomas Harte	af69b21033	This is almost complete, except that it doesn't act appropriately if some bits are written but not enough to cover the entire writing period.	2016-12-24 22:51:26 -05:00
Thomas Harte	f601d796f5	Added documentation.	2016-12-24 22:37:20 -05:00
Thomas Harte	6e94d0c19f	Extended Storage::Disk::Disk to permit write-back of modified tracks, exposed some interface via Storage::Disk::Drive.	2016-12-24 22:11:31 -05:00
Thomas Harte	7f303cfceb	Continued the baby steps.	2016-12-24 21:54:43 -05:00
Thomas Harte	afc6f4129c	Withdrew unused tally.	2016-12-24 21:47:57 -05:00
Thomas Harte	1e416d4af0	Withdrew now-unused and never-implemented API from TimedEventLoop, and the redundant track time count from DiskController.	2016-12-24 21:02:10 -05:00
Thomas Harte	bedea48d03	This is a much better way of dealing with being partway into an incoming event. Subject to eliminating overruns, of course.	2016-12-24 20:54:27 -05:00
Thomas Harte	4cb17143ef	Messing around trying to lock down timing precisely. Which includes formal initial conditions.	2016-12-24 15:18:46 -05:00
Thomas Harte	1e970a9772	Started stepping slowly towards allowing writing on the disk controller, taking the opportunity to introduce self-simplifying behaviour to Storage::Time.	2016-12-24 13:07:23 -05:00
Thomas Harte	e4e0347638	Attempted to consolidate some of the repetition.	2016-12-21 22:17:00 -05:00
Thomas Harte	03579f33f1	Fixed multi-coverage insertion, via an appropriate test.	2016-12-20 21:38:32 -05:00
Thomas Harte	7eca910cc5	Fixed insertion location finding logic, working on the relevant test.	2016-12-20 21:14:05 -05:00
Thomas Harte	823ab9bc34	Completed initial non-trivial test, fixing revealed errors.	2016-12-20 19:15:36 -05:00
Thomas Harte	5a508ea0df	Attempted properly to cover the exactly-equal starts and ends cases, and to improve meaning.	2016-12-20 18:32:49 -05:00
Thomas Harte	63d861a2f3	Switched from C-in-the-brain manual offset counting to using iterators like an ordinary C++ person.	2016-12-20 18:17:54 -05:00
Thomas Harte	6f17076003	Switched to much more logical shared_ptr ownership of PCMSegmentEventSources by Periods.	2016-12-20 18:13:10 -05:00
Thomas Harte	497b2ae4dd	Still by manual inspection: the time for the next event should be provisional until proven acceptable, allowing a proper measurement of time until exiting the period to be taken; also fixed the accumulated period error when seeking back onto the underlying track.	2016-12-20 08:14:16 -05:00
Thomas Harte	6bdde542c5	Edging towards functioning automatic tests, fixed right-period adjustment and slightly decreased searching cost while in the process of adding a test.	2016-12-20 07:52:14 -05:00
Thomas Harte	ec624eaab1	Made an attempt fully to implement PCMPatchedTrack. Which now requires tests.	2016-12-20 07:30:57 -05:00
Thomas Harte	1ef1f6ec69	Attempted to implemnt seek_to and to finish add_segment. Started doing a little of get_next_event but ran out of time for the day.	2016-12-19 21:46:02 -05:00
Thomas Harte	8f937ceac8	Made an attempt to come up with a data structure that actually makes sense (though perhaps this is textbook list rather than vector stuff? I guess it depends on the frequency I expect inserts to occur versus reads) and to implement inserts. Though the Periods aren't yet honoured.	2016-12-19 07:42:43 -05:00
Thomas Harte	e081f224b6	Implemented a very basic PCMTrack test, nevertheless revealing an oversight in PCMSegmentEventSource related to improperly counting to the index hole if the final bit is set. Took that as a message that I should comment and document the event source.	2016-12-18 22:53:24 -05:00
Thomas Harte	a6354ebb01	Reimplemented PCMTrack to use PCMSegmentEventSource, eliminating code duplication.	2016-12-18 21:37:05 -05:00
Thomas Harte	f9a5595dad	Added seeking tests, correcting such errors as uncovered.	2016-12-18 10:19:24 -05:00
Thomas Harte	3297f6d545	Made an attempt to implement seek_to on PCMSegmentEventSource, taking account of off-by-half counting.	2016-12-17 22:44:33 -05:00
Thomas Harte	3116a2cf4c	Realised I was actually testing PCMSegmentEventSource, not PCMSegment; implemented a spread of tests; hence fixed PCMSegmentEventSource.	2016-12-17 21:47:13 -05:00
Thomas Harte	254cc41fd6	Made an attempt to separate and isolate the stuff of creating flux events from a PCMSegment, eventually to factor that out of PCMTrack and make it available also to PCMPatchedTrack.	2016-12-17 21:13:57 -05:00
Thomas Harte	313db75303	Ensured the patchable track owns its underlying track.	2016-12-17 18:17:22 -05:00
Thomas Harte	f1a08b7ab5	Opted to pass times by reference and added enough to PCMPatchedTrack that it could start being used by the disk controller, albeit that it doesn't work.	2016-12-17 16:26:45 -05:00
Thomas Harte	dc08a23ceb	This is going to be a slow walk, I think. This class attempts to be the scratchpad which will hold in-memory track modifications.	2016-12-16 19:20:38 -05:00
Thomas Harte	c4041b06a8	This'll do as a write interface, won't it?	2016-12-07 22:19:20 -05:00
Thomas Harte	0dc2aa6454	Commuted all of 'Storage' other than 'Tape' to postfix underscores.	2016-12-03 11:59:28 -05:00
Thomas Harte	81ee834530	As well as a bunch of logging, reinstated rotation position preservation across tracks.	2016-12-02 18:36:47 -05:00