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74 Commits

Author SHA1 Message Date
David Given
0644d6d965 Remove some stray tracing (which was causing problems). Fix a potential problem 
where sampleclock posedges could be lost in the sequencer.
 2020-03-29 23:11:53 +02:00
David Given
a075694d8e Rewrite the sequencer to work with the new six bit bytecode. Fiddle with the 
USB stuff a lot in an attempt to resolve the weird packet loss issue.
 2020-03-29 15:10:35 +02:00
David Given
00087cbb6b Fix a catastrophic DMA setup bug which was causing (probably) every other byte 
of data to be mixed up with every other byte... but as every other byte was a
0x80 we never noticed up until now.
 2020-03-20 00:06:58 +01:00
David Given
1b48ea20c4 Remove the cruncher. 2020-03-20 00:06:07 +01:00
David Given
1025bd857b Don't crashloop if the USB's not connected, as it causes the drives to be 
constantly reprobed (which runs the motor).
 2020-02-27 22:32:27 +01:00
David Given
c47a563790 Don't seek to track -1 on homing (it appears to upset 8" drives). Detect which 
drives are present, so that if only a single drive is attached then it's always
track 0, regardless of which connector it's on.
 2020-02-24 21:47:40 +01:00
David Given
2df9920209 Rename test bulktransport to test bandwidth; avoid watchdog failures while the 
bandwidth test is running.
 2020-02-18 19:12:52 +01:00
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
edc56d44d6 Non-functioning archive checkin: You can only have 120-odd DMA buffers, so my 
last 'fix' was in fact non-functional.
 2020-02-17 23:28:40 +01:00
David Given
ef4eff0195 So writing now works, but only if USB DMA is enabled. But that breaks reading. 
I've worked round this in a simple but brute force manner and it now looks as
if reading *and* writing work, more or less. There does still seem to be the
odd bad sector when writing 1440kB disks.
 2020-02-17 21:41:01 +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
933ffe7ab4 Find and attempt to fix a memory corruption error when sampling --- if the next 
fragment arrives from the sampler before usbbuffer has finished being
transmitted via USB, it'll get overwritten. I've disabled DMA USB to make the
code easier to understand and made sure that we flush things more rigorously.
This may help the weird pipe errors, too.
 2020-01-27 21:40:27 +01:00
David Given
b0c675c589 Improved error messages when using fe-rpm and it doesn't work. 2020-01-12 01:34:12 +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
edbe624c5a Hopefully, finally, fix the hang-on-read issue. 2019-12-12 20:09:49 +01:00
David Given
44e2334815 Typo fix. Make sure that both drives get deselected when the motor stops (to 
make the LEDs go out).
 2019-12-12 00:17:59 +01:00
David Given
072a097003 Archival (non-functioning) checkin of Verilog-based sampler code. Sadly, we've 
run into size limits for the device, and I need to slim down.
 2019-12-11 22:51:27 +01:00
David Given
a66e704bab Start ripping out the awful UDB-based sampler code, replacing it with a Verilog 
one and a standalone FIFO. This gets the FIFO working.
 2019-12-11 21:13:57 +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
91d6e9aeb9 Rewrite the sequencer engine with a separate fifo component and a pure verilog 
sequencer --- much easier to understand. We can write disks again!
 2019-11-25 20:52:13 +01:00
David Given
a40b26ff46 Archival checkin for trying to figure out why writes no longer work. 2019-11-24 15:14:32 +01:00
David Given
56a36072f7 Sampler state machine cleanup; more debugging tools for the logic analyser. 2019-07-12 21:09:53 +02:00
David Given
d1c2e2b611 Better handling of seeks (plus tracing). 2019-05-01 13:06:56 +02:00
David Given
46b48f4638 Ignore the /DSKCHG line --- it doesn't add a lot of value (it allows us to 
rehome if people change disks while the motor is running) and it means that
people need to worry about whether their drive produces /DSKCHG or /READY.
 2019-04-21 01:15:30 +02:00
David Given
da8cae61b7 Add a debug UART back on pin 2.0 to get some semblance of debug information off 
the board. Discover a fun edge case where output transfers that were an exact
number of frames weren't being terminated correctly.
 2019-04-06 17:59:23 +02:00
David Given
707563bec6 Hopefully fix the underrun issue when reading from HD disks. 2019-03-27 22:10:58 +01:00
David Given
098b2371a4 Crunched datastreams are now used when writing. 2019-03-27 21:58:41 +01:00
David Given
bcc5a5f2cd Interim but working support for crunched data streams when reading from the 
device; writes haven't been converted yet. Reduces the bandiwidth from about
800kB/s to about 500kB/s, which is about what I thought.
 2019-03-26 23:03:19 +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
f20ad8368a Non-working basis of a UDB datapath based sequencer. No more clock errors. 2019-02-28 01:03:58 +01:00
David Given
864a3c0e4b Use 16-bit DMA transfers now we have a FIFO. Better CPU efficiency! 2019-02-27 23:56:17 +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
039d6b5fdd More fiddling with the UDB sampler. Still doesn't work. 2019-02-26 22:37:45 +01:00
David Given
d3df012468 Initialise the FIFOs. Doesn't do any good. 2019-02-25 23:52:44 +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
34a4c888b5 Rewrite the Verilog *again*, and increase the CPU clock rate --- it's now a 
little more reliable at reading long intervals off disk, but does seem to be
doing it. I'm going to definitely need some better sampling logic here and
probably a FIFO. But it'll do for now.
 2019-02-23 19:51:27 +01:00
David Given
753a4a21ef Rewrite the sampler Verilog to use much more consistent logic. Still doesn't 
work for long intervals, though.
 2019-02-23 12:42:42 +01:00
David Given
970668aca5 Non-working attempt to replace the playback logic with Verilog. 2019-02-22 21:26:54 +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
65315f4603 Take out the UART --- it's too much hassle. 2019-02-09 23:02:05 +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
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
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
e6a424d17a Abruptly realise that the capture logic was completely missing transitions too 
big to time; so, redesign it. Now the longest transition is 0xfe ticks and a
pulse is inserted if it's too long. Capture is way more robust now and the
resulting pulsetrain is a solid 198ms; and I wrote my first readable disk! (A
PC HD disk. Sadly, writing to the Brother didn't work.)
 2018-10-17 00:26:33 +02:00