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
...
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
...
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
...
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
...
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
...
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
...
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
...
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
...
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.
...
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
...
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
...
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
...
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
...
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
