David Given
74d051dff3
Start sketching out the write code; attempt to make more robust in the face of
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the weird data dropouts.
2018-10-06 13:47:34 +02:00
David Given
bf3e689708
Sketch out the replay logic, although it's not connected to anything yet.
2018-10-05 23:42:32 +02:00
David Given
d6b71beacf
Reduced the sampling rate to 8MHz; 16MHz means that on a 720kB disk some
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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
5a0229b06f
Rewrite most of the MFM decoder... again. Now it parses the records to find out
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what they are and how big they are. After lots of tinkering with the clock
code, it now correctly decodes a 720kB floppy into records. Something seems to
have gone wrong with 1.44MB floppy capture, though.
2018-10-05 21:57:24 +02:00
David Given
3276ed785e
Replace the MFM decoder logic with something which very nearly works. Now I
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search for the sync region before each record and recalculate the clock from
that. Unfortunately, knowing when I've reached the end of a record and so
should start resyncing is hard without parsing the records themselves, and so I
frequently lose byte phase between records.
2018-10-04 22:36:36 +02:00
David Given
339cdd5105
Add a partially working MFM decoder --- MFM's fine, it's aligning to sync bytes
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which is hard.
2018-10-04 00:02:13 +02:00
David Given
fccabb3266
Add back in the hacky output file, for testing; replace the capture logic with
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an upcounter, and replace the pulse-in-high-bit stuff.
2018-10-03 19:45:27 +02:00
David Given
a8738915e9
You can now read complete disk images into a database file.
2018-10-03 00:03:50 +02:00
David Given
841c1ed516
Attempt to capture rollover events --- don't think it works. Add a basic
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command processor.
2018-10-02 23:03:07 +02:00
David Given
913829afbb
Discover timers; drastically simplify and betterify everything.
2018-10-02 00:17:37 +02:00
David Given
51cb1ae785
We just read our first floppy! Turns out the secret is to, once again, remove
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C7 from the board as it's preventing the READ DATA line showing anything.
2018-10-01 23:30:51 +02:00
David Given
4e19882d76
Archival checkin of messed-about non-working code to actually read data from
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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
David Given
e5155d98cc
You can now transfer gibberish from the FluxEngine to the PC to test bandwidth.
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On Windows we're getting 620kB/s.
2018-09-29 18:32:06 +02:00
David Given
c174e5cafe
You can now measure the rotation speed from the interval between index pulses.
2018-09-29 16:37:04 +02:00
David Given
026842b8a4
There's a seek command now, which might even work.
2018-09-29 14:51:01 +02:00
David Given
7d98ec7e01
Okay, the USB stuff works! I can send a command to the device and receive the
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reply.
2018-09-29 12:13:00 +02:00
David Given
09ec9065cc
Fix incredibly stupid crashing bug.
2018-09-26 00:52:26 +02:00
David Given
d06e201933
Finally figure out the secrets of WCID, so we don't need a signed driver to do
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raw endpoints. Hurrah! Rip out the CDC stuff in favour of them.
2018-09-26 00:37:19 +02:00
David Given
7fc3b882d6
Lots of wasted time trying to make raw endpoints work --- but you can't do that
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on Windows because libusb can't talk to any device without a signed driver.
Stupid Windows.
Luckily I can get 500+kB/s out of CDC, even on Windows, so let's use that.
2018-09-25 00:11:06 +02:00
David Given
a332fd0308
Added some Unix stuff and a crude benchmark.
2018-09-24 01:12:14 +02:00
David Given
264cf47c00
Add the skeleton of the client-side program.
2018-09-23 13:13:29 +02:00
David Given
755ae2950d
Attempt to DMA data gibberish data from a fake acquisition unit and send it out
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over USB.
2018-09-23 02:05:20 +02:00
David Given
9d00a1e5ea
Bolt on USB UART.
2018-09-22 22:08:49 +02:00
David Given
a59c764dc5
Initial project boilerplate.
2018-09-22 21:44:33 +02:00
David Given
ee608cf66f
Initial commit
2018-09-22 21:05:57 +02:00
