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57 Commits

Author SHA1 Message Date
David Given
3c17e74f6d Bump the protocol version to ensure people upgrade. 2022-03-26 21:54:29 +00:00
David Given
96214bf3fd Refactor for better multi-read support. Each read is now held separately, with 
F_DESYNC being deprecated, and FluxSource returns an iterator which can be used
to retry reads.
 2022-03-07 00:07:42 +01:00
David Given
d157b7b05d Make libusbp work on Windows; rework the Microsoft-specific bits of the 
firmware to match. This does at least allow us to get rid of the patcher.
 2021-12-12 17:25:24 +00:00
dg
18d90c44dd Rework the flux decoders to add a desync opcode for separating multiple reads 
in a flux stream. Finally add a unit test for the flux decoder.
 2021-12-05 14:42:57 +00:00
dg
298f77f52e Add the FL2 reader. 2021-12-05 11:33:19 +00:00
David Given
4f0a5e854c Attempt to rework the USB handling to make the GreaseWeazle work on Windows and 
Mac --- we abandon autodetection for anything other that FluxEngines as libusb
is painfully inconsistent with serial devices.
 2021-05-23 18:53:25 +01:00
Eric Anderson
f1506d0dbd Add firmware support for hard sectors 2020-12-24 17:39:52 -08:00
David Given
2b53ac057c Fix some bugs which allow erasing tracks with F_FRAME_WRITE_CMD to work again. 
(F_FRAME_ERASE_CMD always worked.)
 2020-05-13 23:45:58 +02:00
David Given
64694580cd Remember to bump the protocol number after the bytecode change. 2020-04-03 21:46:51 +02:00
David Given
fc2655ecd6 Rework the bytecode format to use a much simplified setup: a six-bit timer with 
the top two bits reserved for pulse and index state. This is actually smaller,
bandwidth-wise, than the old version, and may be smaller than the crunched
version.
 2020-03-14 18:58:43 +00:00
David Given
1a6c6b5420 The bandwidth tester now tests bandwidth in both directions. It looks like my 
default USB port only gets about 500kB/s write bandwidth. However, when plugged
into a port with 850kB/s, I still get underrun errors...
 2020-02-17 23:58:40 +01:00
David Given
df8d45bf66 Rework the output fifo to be a bit more correct about the sync signals, which 
in turn allows the sequencer to lose less time --- this gets the effective
clock rate down to about 1.01us. However we still seem to lose the last sector
on 18-sector disks and there are some disk reads so something is still wrong.
 2020-02-17 00:13:13 +01:00
David Given
29bdfc043a Allow fractional revolutions and non-synced reading. Find more things which 
need fixing in the firmware sampler.
 2020-01-27 22:52:25 +01:00
David Given
d77841c3b7 Add the ability to fake the index pulse source, allowing old drives to be used 
with FluxEngine.
 2020-01-12 01:23:47 +01:00
David Given
bcc9e9d9a5 Bump the protocol number (I forgot last time I changed the protocol). 2020-01-10 21:04:33 +01:00
David Given
32bb956710 Detect voltage levels *correctly*. 2019-12-11 00:05:34 +01:00
David Given
f436d6b582 Add a feature where we can measure the FDD bus signal voltages using the PSoC's 
ADCs. Increase the track step pulse width to 6us, because.
 2019-12-10 22:36:18 +01:00
David Given
5ce2acdfb4 The new decoder architecture now works, at least for the FB100. All I need now 
is to rewrite every single other decoder.
 2019-04-18 00:47:28 +02:00
David Given
7dd7057e1b Bump protocol number. 2019-03-28 23:10:08 +01:00
David Given
dfbe839826 Bump the protocol number. 2019-03-27 22:11:15 +01:00
David Given
098b2371a4 Crunched datastreams are now used when writing. 2019-03-27 21:58:41 +01:00
David Given
0453837c03 The high-density flag now actually changes the high-density line to the drive. 2019-03-26 20:05:16 +01:00
David Given
45eaf14133 Add a flag for setting the drive to high density mode. 2019-03-23 11:32:55 +01:00
David Given
4fe27afe9f Backed out changeset cd5bed99b0b4 --- erroneously pushed to master. 2019-03-24 17:59:17 +01:00
David Given
7f9a85ff77 Add a flag for setting the drive to high density mode. 2019-03-23 11:32:55 +01:00
David Given
379985c2bc Rework the sampler state machine, with new, better, simpler bytecode at twice 
the bandwidth; we now record the state of the index hole.
 2019-03-06 21:09:07 +01:00
David Given
4b0c7b095b FINALLY make the UDB-based sampler work... although without rollover, yet. 
Sadly I seem to also have broken the sequencer.
 2019-02-27 23:00:47 +01:00
David Given
74c6c6db56 Non-working attempt at replacing the sampler with a UDB datapath (so I can use 
the FIFO).
 2019-02-24 14:50:33 +01:00
David Given
a77925fe64 Replace the complicated sampler with 10 lines of Verilog; the hardware should 
now be able to handle any length of transition. And it's simpler.
 2019-02-22 20:01:34 +01:00
David Given
2527ac2ce9 Initial support for twin drives and 5.25" drives. 2019-02-11 23:43:44 +01:00
David Given
9f64de0c49 Do a recalibrate when retrying a track read --- it makes things a bit more 
reliable.
 2019-02-09 22:55:46 +01:00
David Given
4181736073 Added fe-writetestpattern. 2019-01-23 01:05:49 +01:00
David Given
80cb1e7a81 Add the ability to erase tracks. The writer now erases tracks for which no data 
is available.
 2019-01-10 23:51:47 +01:00
David Given
4f83aa8623 Change the USB ID to the new 1209:6e00 one allocated from pidcodes.github.com. 2018-12-14 19:08:19 +01:00
David Given
7efaae2f76 Add the skeleton of the new client app. 2018-10-20 13:28:20 +02:00
David Given
8648405710 Move the old client into its own directory; discover a file I forgot to check 
in!
 2018-10-20 11:53:55 +02:00
David Given
f9146b2b92 You can now record multiple revolutions (necessary for the Brother which puts 
the index hole in the wrong place). Sector header record GCR is solved,
probably; data record GCR is partially solved, although kinda weird (should
check that my pulse train decoder isn't dropping bits).
 2018-10-19 02:11:38 +02:00
David Given
3dec0ac54d Add the skeleton of the Brother GCR decoder. 2018-10-18 01:44:59 +02:00
David Given
607bb141b3 Radically rework decoding: there's now a simple statistical clock guesser, and 
then we read the pulsetrain into nice tidy bits with a proper clock, which
makes the decoder's job way easier. We can actually get rid of the entire MFM
decoder state machine. Also, after sorting out the magic bit patterns at the
beginning of records, we can now reliably pull them out of the bitstream
without needing to know anything about the records themselves.
 2018-10-18 00:27:48 +02:00
David Given
ed5b9c0b8d Implement simple precompensation; it makes HD writes more reliable (still not 
quite right, though), but seems to mangle DD.
 2018-10-13 20:04:52 +02:00
David Given
aa7d420754 Start work on an autocalibrator to detect precompensation, but something's gone 
wrong and our reads are all bunk.
 2018-10-13 12:04:37 +02:00
David Given
5d4e929302 Added the fluxdump command, for exporting a fluxmap into something like 
Audacity where it can be visualised.
 2018-10-10 23:02:45 +02:00
David Given
1430dfc4e1 Add the test pattern generator back again. Try some experimental code to 
convert a fluxmap into an encoding_buffer, but locking each pulse to a us grid.
I'm not sure whether this is good enough for reliable decoding, but early
indications look promising.
 2018-10-09 23:46:24 +02:00
David Given
40b9fbc25d Fix ghastly DMA ordering bug leading to corrupted writes. Writes are less 
corrupted! Still can't reliably read back what I wrote, though. Added a test
pattern feature to write, to aid debugging.
 2018-10-09 00:23:21 +02:00
David Given
30271d7e95 Just enough writing works to utterly destroy tracks now. 2018-10-06 23:01:24 +02:00
David Given
8f1cef48b1 Realise that the weird data dropouts were due to a stray capacitor on the 
board... so remove it. Better now. Also realise that PSoC Creator lies to you
about clocks, so adjust the sample clock to be derivable from the USB clock,
making it both the right frequency and much more accurate --- decode success is
dramatically improved (presumably due to less jitter). Redesign the capture
logic to use a timer; simpler now.
 2018-10-06 18:32:57 +02:00
David Given
74d051dff3 Start sketching out the write code; attempt to make more robust in the face of 
the weird data dropouts.
 2018-10-06 13:47:34 +02:00
David Given
d6b71beacf Reduced the sampling rate to 8MHz; 16MHz means that on a 720kB disk some 
samples are more than 128 ticks apart! Doubled the settling time to make reads
more reliable; added disk change logic to rehome the disk when you replace
floppies.
 2018-10-05 22:58:56 +02:00
David Given
339cdd5105 Add a partially working MFM decoder --- MFM's fine, it's aligning to sync bytes 
which is hard.
 2018-10-04 00:02:13 +02:00
David Given
4e19882d76 Archival checkin of messed-about non-working code to actually read data from 
disk. Something's wrong with the DMA; requesting a transfer every 2us with a TD
size of 64 bytes is somehow leading to an nrq interrupt every 8us. Mysterious.
 2018-09-30 01:13:39 +02:00