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73 Commits

Author SHA1 Message Date
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
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
6389e8a756 Update pin number (which was wrong). 2019-12-12 20:35:20 +01:00
David Given
c187b79d80 Add a 300RPM clock on 3[0] and a 360RPM clock on 3[1], for use with faking 
index pulses to the drive.
 2019-12-12 20:34:44 +01:00
David Given
b448ab7917 Finally squeeze everything in to the Verilog sampler. It does seem to work 
better... the the USB hangup problem persists. Mac disks are still
nigh-unreadable.
 2019-12-12 00:12:20 +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
3094c5c919 Add missing files. 2019-11-29 18:49:22 +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
ebcb9c4bb0 Switch the output lines to open-drain drive low. 2019-11-24 02:06:45 +01:00
David Given
c266779433 Fix a bug where index pulses where being turned into flux pulses on read, 
leading to completely broken data whenever an index pulse happened.
 2019-08-27 23:58:07 +02:00
David Given
56a36072f7 Sampler state machine cleanup; more debugging tools for the logic analyser. 2019-07-12 21:09:53 +02:00
David Given
1e3581c5f3 Turns out I was using the wrong error threshold flags for Mac disks. ND disks 
work fine now.
 2019-07-10 23:55:16 +02:00
David Given
7a775afaea Make sure that CounterClock is actually 12MHz, and not 12-ish MHz. Doesn't 
help.
 2019-07-10 20:26:17 +02:00
David Given
c27c4fe312 Synchronise input pins and set LVTTL levels. More correct, but doesn't help the 
read issues.
 2019-07-10 19:48:03 +02:00
David Given
ad295c683c The sampler pulse conversion now uses BUS_CLK as the sample clock. 2019-07-09 22:43:46 +02:00
David Given
98ea5e9600 Connect up pins 2.3, 2.4 and 2.5 for debugging with a logic analyser. 2019-07-08 01:08:05 +02:00
David Given
ce6077fa22 Apply Denis Kushch's timing fixes to the schematic. No more warnings on builds! 2019-07-08 00:52:59 +02:00
David Given
783b4fcf36 Switch the USB component to ask for 100mA rather than 500mA. 2019-04-21 01:18:28 +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
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
29b66086ea The sequencer now (I hope, untested) supports waiting for the index hole. It's 
certainly no more non-functional than it was before, i.e. it writes Brother
disks fine.
 2019-03-07 00:10:12 +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
f20ad8368a Non-working basis of a UDB datapath based sequencer. No more clock errors. 2019-02-28 01:03:58 +01:00
David Given
6bcd9a6644 The UDB-based pulse generator is back. The problem was I was trying to write to 
a HD disk (also the logic was wrong). I think my new Sony drive doesn't
autoselect.
 2019-02-27 23:34:55 +01:00
David Given
b8138aef40 Replace the UDB based pulse generator with the old counter-based one, which 
seems to work.
 2019-02-27 23:18:19 +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
462d15369e Create a pulse generator UDB component --- hopefully cheaper than what we're currently doing. 2019-02-26 23:33:06 +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
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
575213687e Move the pins to the other side of the board, so we don't need the capacitor 
hack any more.
 2019-02-09 22:50:43 +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
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
David Given
99e222d012 Change the record mechanism to use an upcounter, not a timer. 2018-10-13 16:54:51 +02:00
David Given
b46d55cc07 The USB capture/replay interface now uses timestamps rather than intervals; 
this makes the hardware considerably simpler and more reliable (as I don't need
to spend time resetting the timers between pulses). Still doesn't help writes,
though. Simplify and improve clock detection; add an abortive attempt at an FM
decoder (turns out that the Brother doesn't use FM).
 2018-10-13 01:19:17 +02:00
David Given
9dcfbc2ab1 More replay timer simplification: more robust? 2018-10-10 23:15:20 +02:00