Merge pull request #211 from davidgiven/patch-1

Add missing zlib dependency.
2025-10-31 11:17:01 -07:00 · 2021-01-11 11:59:22 +01:00 · 2021-01-11 11:57:59 +01:00 · 2021-01-10 13:55:55 +01:00 · 2021-01-10 12:34:55 +01:00 · 2021-01-10 12:26:09 +01:00
36 changed files with 1660 additions and 304 deletions
--- a/FluxEngine.cydsn/CortexM3/ARM_GCC_541/Release/FluxEngine.hex
+++ b/FluxEngine.cydsn/CortexM3/ARM_GCC_541/Release/FluxEngine.hex
@@ -1,246 +1,246 @@
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@@ -4615,12 +4615,12 @@
 :0200000490105A
 :04000000BC90ACAF55
 :0200000490303A
-:0200000096F078
+:02000000CEC56B
 :0200000490402A
 :4000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000C0
 :400040000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000080
 :400080000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000040
 :4000C0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
 :0200000490501A
-:0C00000000012E16106900002E2FA759D9
+:0C00000000012E16106900002E2FDF2ECC
 :00000001FF
--- a/FluxEngine.cydsn/main.c
+++ b/FluxEngine.cydsn/main.c
@@ -21,6 +21,10 @@ static bool drive1_present;

 static volatile uint32_t clock = 0; /* ms */
 static volatile bool index_irq = false;
+/* Duration in ms. 0 causes every pulse to be an index pulse. Durations since
+ * last pulse greater than this value imply sector pulse. Otherwise is an index
+ * pulse. */
+static volatile uint32_t hardsec_index_threshold = 0;

 static bool motor_on = false;
 static uint32_t motor_on_time = 0;
@@ -69,12 +73,34 @@ static void system_timer_cb(void)

 CY_ISR(index_irq_cb)
 {
-    index_irq = true;
+    /* Hard sectored media has sector pulses at the beginning of every sector
+     * and the index pulse is an extra pulse in the middle of the last sector.
+     * When the extra pulse is seen, the next sector pulse is also the start of
+     * the track. */
+    static bool hardsec_index_irq_primed = false;
+    static uint32_t hardsec_last_pulse_time = 0;
+
+    if (!hardsec_index_threshold)
+    {
+        index_irq = true;
+        hardsec_index_irq_primed = false;
+    }
+    else
+    {
+        index_irq = hardsec_index_irq_primed;
+        if (index_irq)
+            hardsec_index_irq_primed = false;
+        else
+            hardsec_index_irq_primed =
+                clock - hardsec_last_pulse_time <= hardsec_index_threshold;
+        hardsec_last_pulse_time = clock;
+    }
    
    /* Stop writing the instant the index pulse comes along; it may take a few
     * moments for the main code to notice the pulse, and we don't want to overwrite
     * the beginning of the track. */
-    ERASE_REG_Write(0);
+    if (index_irq)
+        ERASE_REG_Write(0);
 }

 CY_ISR(capture_dma_finished_irq_cb)
@@ -269,7 +295,7 @@ static void cmd_recalibrate(void)
    send_reply(&r);    
 }
    
-static void cmd_measure_speed(struct any_frame* f)
+static void cmd_measure_speed(struct measurespeed_frame* f)
 {
    start_motor();
    
@@ -288,10 +314,14 @@ static void cmd_measure_speed(struct any_frame* f)

    if (elapsed != 0)
    {
-        index_irq = false;
+        int target_pulse_count = f->hard_sector_count + 1;
        start_clock = clock;
-        while (!index_irq)
-            elapsed = clock - start_clock;
+        for (int x=0; x<target_pulse_count; x++)
+        {
+            index_irq = false;
+            while (!index_irq)
+                elapsed = clock - start_clock;
+        }
    }
    
    DECLARE_REPLY_FRAME(struct speed_frame, F_FRAME_MEASURE_SPEED_REPLY);
@@ -404,10 +434,12 @@ static void cmd_read(struct read_frame* f)
        
    if (f->synced)
    {
+        hardsec_index_threshold = f->hardsec_threshold_ms;
        index_irq = false;
        while (!index_irq)
            ;
        index_irq = false;
+        hardsec_index_threshold = 0;
    }
    
    dma_writing_to_td = 0;
@@ -596,6 +628,7 @@ static void cmd_write(struct write_frame* f)
                /* Wait for the index marker. While this happens, the DMA engine
                 * will prime the FIFO. */

+                hardsec_index_threshold = f->hardsec_threshold_ms;
                index_irq = false;
                while (!index_irq)
                    ;
@@ -630,6 +663,7 @@ abort:
    }
    
    print("p=%d cr=%d cw=%d f=%d w=%d index=%d underrun=%d", packets, count_read, count_written, finished, writing, index_irq, dma_underrun);
+    hardsec_index_threshold = 0;
    if (!finished)
    {
        /* There's still some data to read, so just read and blackhole it ---
@@ -663,6 +697,7 @@ static void cmd_erase(struct erase_frame* f)
    /* Disk is now spinning. */
    
    print("start erasing");
+    hardsec_index_threshold = f->hardsec_threshold_ms;
    index_irq = false;
    while (!index_irq)
        ;
@@ -671,6 +706,7 @@ static void cmd_erase(struct erase_frame* f)
    while (!index_irq)
        ;
    ERASE_REG_Write(0);
+    hardsec_index_threshold = 0;
    print("stop erasing");

    DECLARE_REPLY_FRAME(struct any_frame, F_FRAME_ERASE_REPLY);
@@ -796,7 +832,7 @@ static void handle_command(void)
            break;
        
        case F_FRAME_MEASURE_SPEED_CMD:
-            cmd_measure_speed(f);
+            cmd_measure_speed((struct measurespeed_frame*) f);
            break;
            
        case F_FRAME_BULK_WRITE_TEST_CMD:
--- a/README.md
+++ b/README.md
@@ -24,6 +24,14 @@ Don't believe me? Watch the demo reel!
 <iframe width="373" height="210" src="https://www.youtube.com/embed/m_s1iw8eW7o" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>
 </div>

+**New!** The FluxEngine client software now works with
+[GreaseWeazle](https://github.com/keirf/Greaseweazle/wiki) hardware. So, if you
+can't find a PSoC5 development kit, or don't want to use the Cypress Windows
+tools for programming it, you can use one of these instead. Very nearly all
+FluxEngine features are available with the GreaseWeazle and it works out-of-the
+box. See the [dedicated GreaseWeazle documentation page](doc/greaseweazle.md)
+for more information.
+
 **Important note.** On 2020-04-02 I changed the bytecode format (and firmware).
 Flux files will need to be upgraded with `fluxengine upgradefluxfile`. The new
 format should be more reliable and use way, way less bandwidth. Sorry for the
@@ -52,8 +60,15 @@ following friendly articles:
  - [Using a FluxEngine](doc/using.md) ∾ what to do with your new hardware ∾
    flux files and image files ∾ knowing what you're doing

-  - [Troubleshooting dubious disks](doc/problems.md) ∾ it's not an exact science ∾
-    the sector map ∾ clock detection and the histogram
+  - [Using GreaseWeazle hardware with the FluxEngine client
+	software](doc/greaseweazle.md) ∾ what works ∾ what doesn't work ∾ where to
+	go for help
+
+  - [Troubleshooting dubious disks](doc/problems.md) ∾ it's not an exact
+	science ∾ the sector map ∾ clock detection and the histogram
+
+  - [Checking your drive](doc/driveresponse.md) ∾ you can't do that with that ∾
+	measuring your drive's ability to work with exotic formats

 Which?
 ------
--- a/arch/macintosh/encoder.cc
+++ b/arch/macintosh/encoder.cc
@@ -19,7 +19,7 @@ static DoubleFlag postIndexGapUs(
 static DoubleFlag clockCompensation(
 	{ "--clock-compensation-factor" },
 	"Scale the output clock by this much.",
-	.9724);
+	1.0);

 static bool lastBit;

--- a/doc/building.md
+++ b/doc/building.md
@@ -184,7 +184,7 @@ well, although on Windows it'll need MSYS2 and mingw32. You'll need to
 install some support packages.

  - For Linux (this is Ubuntu, but this should apply to Debian too):
-	`ninja-build`, `libusb-1.0-0-dev`, `libsqlite3-dev`.
+	`ninja-build`, `libusb-1.0-0-dev`, `libsqlite3-dev`, `zlib1g-dev`.
  - For OSX with Homebrew: `ninja`, `libusb`, `pkg-config`, `sqlite`.
  - For Windows with MSYS2: `make`, `ninja`, `mingw-w64-i686-libusb`,
 	`mingw-w64-i686-sqlite3`, `mingw-w64-i686-zlib`, `mingw-w64-i686-gcc`.
--- a/doc/driveresponse.md
+++ b/doc/driveresponse.md
@@ -0,0 +1,81 @@
+Analysing drive response
+========================
+
+Not all PC drives are made equal. Some are less equal than others.
+
+The way floppy disk storage works is that the floppy drive controller will
+generate a series of pulses, which the drive stores on the disk. Then, when the
+disk is read, the drive will reproduce the same series of pulses and return it
+to the floppy drive controller. The data is stored in the intervals between
+pulses.
+
+The problem is that some PC drives assume that they're going to be used with
+IBM scheme disks, which use particular pulse intervals --- in the case of DD
+disks, intervals are always 4us, 6us or 8us. So, in a misguided attempt to
+improve reliability, they sometimes... tidy... the incoming pulse stream. This
+can have nasty effects if you're not a disk which _doesn't_ use those intervals.
+
+In addition, they won't work properly if the intervals are too great, or too
+small. Partly this is a limitation of the underlying physics of the magnetic
+media, and partly it's due to the drive's automatic gain adjustment: if the
+drive doesn't see a pulse, it'll start ramping up the gain of its amplifier,
+until it starts interpreting random noise as a valid pulse.
+
+FluxEngine has a tool to analyse a drive and report on this behaviour. It works
+by writing a sequence of timed pulses to the disk, then reading them back and
+seeing what the drive actually reports. To use it, do:
+
+```
+fluxengine analyse driveresponse -d :d=1:t=0 --min-interval-us=0 --max-interval-us=30 --interval-step-us=.1 --write-csv=driveresponse.csv
+python3 scripts/driveresponse.csv
+```
+
+This will scan all intervals from 0us to 30us, at 0.1us steps, and write the
+result as a CSV file. Then the Python script uses matplotlib to render the
+result as a heatmap. They look like this.
+
+(Click to expand)
+
+<div style="text-align: center">
+<a href="sony-mpf920-dd.png"><img src="sony-mpf920-dd.png" style="width:40%" alt="Sony MPF-920, DD"></a>
+<a href="sony-mpf920-hd.png"><img src="sony-mpf920-hd.png" style="width:40%" alt="Sony MPF-920, HD"></a>
+</div>
+
+This is the analysis from the [Sony
+MPF-920](https://docs.sony.com/release/MPF920Z.pdf) 3.5" drive I mostly use for
+testing. The left-hand image shows the result from a DD disk, while the right
+hand image shows the result from a HD disk.
+
+The vertical axis is the width of pulse being written; the horizontal axis
+and heatmap shows the distribution of pulses being read back. You can see the
+diagonal line, which represents correct pulses. The triangular smear in the top
+left shows spurious pulses which are being read back because the interval is
+too great; these start at about 12us for DD disks and 7us for HD disks. This is
+an artifact of the different magnetic media for the two types of disk.
+
+(This, by the way, is why you shouldn't use DD formats on HD disks. The
+intervals on a DD disk can go up to 8us, which is on the edge of the ability of
+an HD disk and drive to correctly report back the pulses.)
+
+You also note the hard cut-off on the left: this represents the filter on the
+drive, which will simply refuse to report pulse intervals shorter than about
+1.5us. FluxEngine itself can't write intervals shorter than 2us.
+
+For comparison purposes, here's another set of graphs.
+
+<div style="text-align: center">
+<a href="fdd-90206-dd.png"><img src="fdd-90206-dd.png" style="width:40%" alt="FDD-90206, DD"></a>
+<a href="fdd-90206-hd.png"><img src="fdd-90206-hd.png" style="width:40%" alt="FDD-90206, HD"></a>
+</div>
+
+This is from another drive I have; it's an unbranded combo
+card-reader-and-floppy drive unit; the 90206 is the only identification mark it
+has. I don't use this because it's problematic, and the graph shows why; you
+can just see some ghosting on the HD graph at at 3us, where some pulses are
+coming back reported at 6us. This won't affect IBM scheme disks because they
+don't use 3us as an interval, but it might effect other formats. And the DD
+graph shows that intervals below about 4us are reported as double what they
+should be: so, this drive won't work on [Macintosh 800kB
+formats](disk-macintosh.md) at all, because they use intervals starting at
+2.6us, below this limit. But it should work on PC formats --- just.
+
--- a/doc/fdd-90206-dd.png
+++ b/doc/fdd-90206-dd.png
--- a/doc/fdd-90206-hd.png
+++ b/doc/fdd-90206-hd.png
--- a/doc/greaseweazle.md
+++ b/doc/greaseweazle.md
@@ -0,0 +1,71 @@
+Using the FluxEngine client software with GreaseWeazle hardware
+===============================================================
+
+The FluxEngine isn't the only project which does this; another one is the
+[GreaseWeazle](https://github.com/keirf/Greaseweazle/wiki), a Blue Pill based
+completely open source solution. This requires more work to set up (or you can
+buy a prebuilt GreaseWeazle board), but provides completely open source
+hardware which doesn't require the use of the Cypress Windows-based tools that
+the FluxEngine does. Luckily, the FluxEngine software supports it
+out-of-the-box --- just plug it in and nearly everything should work.
+
+I am aware that having _software_ called FluxEngine and _hardware_ called
+FluxEngine makes things complicated when you're not using the FluxEngine client
+software with a FluxEngine board, but I'm afraid it's too late to change that
+now. Sorry.
+
+If you're using Windows
+-----------------------
+
+In order to access the GreaseWeazle from Windows, you need to install a WinUSB
+driver for it. You can do this with the [Zadig](https://zadig.akeo.ie/)
+program. Download it, plug in the GreaseWeazle, and run it; select Options,
+List All Devices, and then open the big dropdown box and select the
+GreaseWeazle. You should see something like this.
+
+<div style="text-align: center">
+<img src="zadig.png" style="width:80%" alt="Zadig screenshot">
+</div>
+
+Ensure that the Driver boxes say `usbser` and `WinUSB`. Then press 'Replace
+Driver'. Once done, the GreaseWeazle will be visible to the FluxEngine client.
+
+**Important note!** Unfortunately, now, the original GreaseWeazle client won't
+work --- you can't use both drivers at once. I'm working on this. To switch
+back to the original driver, for using the GreaseWeazle client software
+instead, open up Zadig again, go through the same process, but make sure the left Driver box says `WinUSB` and the right one says `USB Serial (CDC)`. Now, when you press 'Replace Driver' the original driver will be restored.
+
+What works
+----------
+
+Supported features with the GreaseWeazle include:
+
+  - simple reading and writing of disks, seeking etc
+  - erasing disks
+  - determining disk rotation speed
+
+What doesn't work
+-----------------
+
+(I'm still working on this. If you have an urgent need for anything, please
+[file an issue](https://github.com/davidgiven/fluxengine/issues/new) and I'll
+see what I can do.)
+
+  - voltage measurement
+  - hard sectored disks (you can still read these, but you can't use
+	`--hard-sector-count`).
+
+Who to contact
+--------------
+
+I want to make it clear that the FluxEngine code is _not_ supported by the
+GreaseWeazle team. If you have any problems, please [contact
+me](https://github.com/davidgiven/fluxengine/issues/new) and not them.
+
+In addition, the GreaseWeazle release cycle is not synchronised to the
+FluxEngine release cycle, so it's possible you'll have a version of the
+GreaseWeazle firmware which is not supported by FluxEngine. Hopefully, it'll
+detect this and complain. Again, [file an
+issue](https://github.com/davidgiven/fluxengine/issues/new) and I'll look into
+it.
+
--- a/doc/problems.md
+++ b/doc/problems.md
@@ -10,6 +10,11 @@ been written to be largely fire-and-forget and is mostly self-adjusting.
 However, there are still some things that can be tuned to produce better
 reads.

+Also, it's important to remember that some drives are problematic --- in
+particular, some 3.5" floppy drives are designed to work with just IBM scheme
+disks with a certain set of pulse intervals. There's a tool to let you diagnose
+this; see [the drive response](driveresponse.md) page.
+
 The sector map
 --------------

--- a/doc/sony-mpf920-dd.png
+++ b/doc/sony-mpf920-dd.png
--- a/doc/sony-mpf920-hd.png
+++ b/doc/sony-mpf920-hd.png
--- a/doc/technical.md
+++ b/doc/technical.md
@@ -82,16 +82,10 @@ FluxEngine hardware on a $2 Blue Pill.
 I am _not_ planning on replacing the PSoC5 with a Blue Pill, because someone
 already has: [the GreaseWeazle](https://github.com/keirf/Greaseweazle/wiki) is
 a completely open source firmware package which will read and write Supercard
-Pro files via a standard Blue Pill. The GreaseWeazle's USB protocol is
-different from the FluxEngine's so they're not directly interchangeable. You
-can, however, read a Supercard Pro file with a GreaseWeazle and then use the
-FluxEngine client to decode it. It should work the other way around, too, but
-FluxEngine's SCP export [is curently
-broken](https://github.com/davidgiven/fluxengine/issues/134).
-
-I _am_ considering adding direct support for the GreaseWeazle to the FluxEngine
-client, which will let you just plug one in and make it go as a direct
-replacement to the FluxEngine hardware.
+Pro files via a standard Blue Pill or via a prebuilt board. It's supported by
+the FluxEngine client software, and you should, mostly, be able to use
+GreaseWeazle hardware interchangeably with FluxEngine hardware. See the
+[dedicated page](greaseweazle.md) for more information.


 ### Some useful links
--- a/doc/zadig.png
+++ b/doc/zadig.png
--- a/lib/fluxsink/fluxsink.h
+++ b/lib/fluxsink/fluxsink.h
@@ -24,6 +24,7 @@ public:
 };

 extern void setHardwareFluxSinkDensity(bool high_density);
+extern void setHardwareFluxSinkHardSectorCount(int sectorCount);

 #endif

--- a/lib/fluxsink/hardwarefluxsink.cc
+++ b/lib/fluxsink/hardwarefluxsink.cc
@@ -3,6 +3,7 @@
 #include "fluxmap.h"
 #include "usb/usb.h"
 #include "fluxsink/fluxsink.h"
+#include "fmt/format.h"

 FlagGroup hardwareFluxSinkFlags = {
 	&usbFlags,
@@ -15,17 +16,37 @@ static IntFlag indexMode(
    "index pulse source (0=drive, 1=300 RPM fake source, 2=360 RPM fake source",
    0);

+static IntFlag hardSectorCount(
+    { "--write-hard-sector-count" },
+    "number of hard sectors on the disk (0=soft sectors)",
+    0);
+
 void setHardwareFluxSinkDensity(bool high_density)
 {
 	::high_density = high_density;
 }

+void setHardwareFluxSinkHardSectorCount(int sectorCount)
+{
+	::hardSectorCount.setDefaultValue(sectorCount);
+}
+
 class HardwareFluxSink : public FluxSink
 {
 public:
    HardwareFluxSink(unsigned drive):
        _drive(drive)
    {
+		if (hardSectorCount != 0)
+		{
+			usbSetDrive(_drive, high_density, indexMode);
+			std::cerr << "Measuring rotational speed... " << std::flush;
+			nanoseconds_t oneRevolution = usbGetRotationalPeriod(hardSectorCount);
+			_hardSectorThreshold = oneRevolution * 3 / (4 * hardSectorCount);
+			std::cerr << fmt::format("{}ms\n", oneRevolution / 1e6);
+		}
+		else
+			_hardSectorThreshold = 0;
    }

    ~HardwareFluxSink()
@@ -38,11 +59,12 @@ public:
        usbSetDrive(_drive, high_density, indexMode);
        usbSeek(track);

-        return usbWrite(side, fluxmap.rawBytes());
+        return usbWrite(side, fluxmap.rawBytes(), _hardSectorThreshold);
    }

 private:
    unsigned _drive;
+    nanoseconds_t _hardSectorThreshold;
 };

 std::unique_ptr<FluxSink> FluxSink::createHardwareFluxSink(unsigned drive)
--- a/lib/fluxsource/fluxsource.h
+++ b/lib/fluxsource/fluxsource.h
@@ -30,6 +30,7 @@ public:
 extern void setHardwareFluxSourceRevolutions(double revolutions);
 extern void setHardwareFluxSourceDensity(bool high_density);
 extern void setHardwareFluxSourceSynced(bool synced);
+extern void setHardwareFluxSourceHardSectorCount(int sectorCount);

 #endif

--- a/lib/fluxsource/hardwarefluxsource.cc
+++ b/lib/fluxsource/hardwarefluxsource.cc
@@ -24,6 +24,11 @@ static IntFlag indexMode(
    "index pulse source (0=drive, 1=300 RPM fake source, 2=360 RPM fake source",
    0);

+static IntFlag hardSectorCount(
+    { "--hard-sector-count" },
+    "number of hard sectors on the disk (0=soft sectors)",
+    0);
+
 static bool high_density = false;

 void setHardwareFluxSourceDensity(bool high_density)
@@ -39,7 +44,11 @@ public:
    {
        usbSetDrive(_drive, high_density, indexMode);
        std::cerr << "Measuring rotational speed... " << std::flush;
-        _oneRevolution = usbGetRotationalPeriod();
+        _oneRevolution = usbGetRotationalPeriod(hardSectorCount);
+	if (hardSectorCount != 0)
+		_hardSectorThreshold = _oneRevolution * 3 / (4 * hardSectorCount);
+	else
+		_hardSectorThreshold = 0;
        std::cerr << fmt::format("{}ms\n", _oneRevolution / 1e6);
    }

@@ -52,7 +61,8 @@ public:
    {
        usbSetDrive(_drive, high_density, indexMode);
        usbSeek(track);
-        Bytes data = usbRead(side, synced, revolutions * _oneRevolution);
+        Bytes data = usbRead(
+			side, synced, revolutions * _oneRevolution, _hardSectorThreshold);
        auto fluxmap = std::make_unique<Fluxmap>();
        fluxmap->appendBytes(data);
        return fluxmap;
@@ -72,6 +82,7 @@ private:
    unsigned _drive;
    unsigned _revolutions;
    nanoseconds_t _oneRevolution;
+    nanoseconds_t _hardSectorThreshold;
 };

 void setHardwareFluxSourceRevolutions(double revolutions)
@@ -84,6 +95,11 @@ void setHardwareFluxSourceSynced(bool synced)
    ::synced.setDefaultValue(synced);
 }

+void setHardwareFluxSourceHardSectorCount(int sectorCount)
+{
+    ::hardSectorCount.setDefaultValue(sectorCount);
+}
+
 std::unique_ptr<FluxSource> FluxSource::createHardwareFluxSource(unsigned drive)
 {
    return std::unique_ptr<FluxSource>(new HardwareFluxSource(drive));
--- a/lib/reader.cc
+++ b/lib/reader.cc
@@ -91,6 +91,11 @@ void setReaderRevolutions(int revolutions)
 	setHardwareFluxSourceRevolutions(revolutions);
 }

+void setReaderHardSectorCount(int sectorCount)
+{
+    setHardwareFluxSourceHardSectorCount(sectorCount);
+}
+
 static void writeSectorsToFile(const SectorSet& sectors, const ImageSpec& spec)
 {
 	std::unique_ptr<ImageWriter> writer(ImageWriter::create(sectors, spec));
--- a/lib/reader.h
+++ b/lib/reader.h
@@ -13,6 +13,7 @@ extern FlagGroup readerFlags;
 extern void setReaderDefaultSource(const std::string& source);
 extern void setReaderDefaultOutput(const std::string& output);
 extern void setReaderRevolutions(int revolutions);
+extern void setReaderHardSectorCount(int sectorCount);

 extern std::vector<std::unique_ptr<Track>> readTracks();

--- a/lib/usb/fluxengineusb.cc
+++ b/lib/usb/fluxengineusb.cc
@@ -144,9 +144,12 @@ public:
 		await_reply<struct any_frame>(F_FRAME_RECALIBRATE_REPLY);
 	}

-	nanoseconds_t getRotationalPeriod(void)
+	nanoseconds_t getRotationalPeriod(int hardSectorCount)
 	{
-		struct any_frame f = { .f = {.type = F_FRAME_MEASURE_SPEED_CMD, .size = sizeof(f)} };
+		struct measurespeed_frame f = {
+			.f = {.type = F_FRAME_MEASURE_SPEED_CMD, .size = sizeof(f)},
+			.hard_sector_count = (uint8_t) hardSectorCount,
+		};
 		usb_cmd_send(&f, f.f.size);

 		auto r = await_reply<struct speed_frame>(F_FRAME_MEASURE_SPEED_REPLY);
@@ -227,13 +230,15 @@ public:
 		await_reply<struct any_frame>(F_FRAME_BULK_READ_TEST_REPLY);
 	}

-	Bytes read(int side, bool synced, nanoseconds_t readTime)
+	Bytes read(int side, bool synced, nanoseconds_t readTime,
+	           nanoseconds_t hardSectorThreshold)
 	{
 		struct read_frame f = {
 			.f = { .type = F_FRAME_READ_CMD, .size = sizeof(f) },
 			.side = (uint8_t) side,
-			.synced = (uint8_t) synced
+			.synced = (uint8_t) synced,
 		};
+		f.hardsec_threshold_ms = (hardSectorThreshold + 5e5) / 1e6; /* round to nearest ms */
 		uint16_t milliseconds = readTime / 1e6;
 		((uint8_t*)&f.milliseconds)[0] = milliseconds;
 		((uint8_t*)&f.milliseconds)[1] = milliseconds >> 8;
@@ -249,7 +254,7 @@ public:
 		return buffer;
 	}

-	void write(int side, const Bytes& bytes)
+	void write(int side, const Bytes& bytes, nanoseconds_t hardSectorThreshold)
 	{
 		unsigned safelen = bytes.size() & ~(FRAME_SIZE-1);
 		Bytes safeBytes = bytes.slice(0, safelen);
@@ -258,6 +263,7 @@ public:
 			.f = { .type = F_FRAME_WRITE_CMD, .size = sizeof(f) },
 			.side = (uint8_t) side,
 		};
+		f.hardsec_threshold_ms = (hardSectorThreshold + 5e5) / 1e6; /* round to nearest ms */
 		((uint8_t*)&f.bytes_to_write)[0] = safelen;
 		((uint8_t*)&f.bytes_to_write)[1] = safelen >> 8;
 		((uint8_t*)&f.bytes_to_write)[2] = safelen >> 16;
@@ -269,12 +275,13 @@ public:
 		await_reply<struct any_frame>(F_FRAME_WRITE_REPLY);
 	}

-	void erase(int side)
+	void erase(int side, nanoseconds_t hardSectorThreshold)
 	{
 		struct erase_frame f = {
 			.f = { .type = F_FRAME_ERASE_CMD, .size = sizeof(f) },
 			.side = (uint8_t) side,
 		};
+		f.hardsec_threshold_ms = (hardSectorThreshold + 5e5) / 1e6; /* round to nearest ms */
 		usb_cmd_send(&f, f.f.size);

 		await_reply<struct any_frame>(F_FRAME_ERASE_REPLY);
--- a/lib/usb/greaseweazle.cc
+++ b/lib/usb/greaseweazle.cc
@@ -0,0 +1,156 @@
+#include "globals.h"
+#include "usb.h"
+#include "protocol.h"
+#include "bytes.h"
+#include "fmt/format.h"
+#include "greaseweazle.h"
+
+Bytes fluxEngineToGreaseWeazle(const Bytes& fldata, nanoseconds_t clock)
+{
+	Bytes gwdata;
+	ByteWriter bw(gwdata);
+	ByteReader br(fldata);
+	uint32_t ticks_fl = 0;
+	uint32_t ticks_gw = 0;
+
+	auto write_28 = [&](uint32_t val) {
+		bw.write_8(1 | (val<<1) & 0xff);
+		bw.write_8(1 | (val>>6) & 0xff);
+		bw.write_8(1 | (val>>13) & 0xff);
+		bw.write_8(1 | (val>>20) & 0xff);
+	};
+
+	while (!br.eof())
+	{
+		uint8_t b = br.read_8();
+		ticks_fl += b & 0x3f;
+		if (b & F_BIT_PULSE)
+		{
+			uint32_t newticks_gw = ticks_fl * NS_PER_TICK / clock;
+			uint32_t delta = newticks_gw - ticks_gw;
+			if (delta < 250)
+				bw.write_8(delta);
+			else
+			{
+				int high = (delta-250) / 255;
+				if (high < 5)
+				{
+					bw.write_8(250 + high);
+					bw.write_8(1 + (delta-250) % 255);
+				}
+				else
+				{
+					bw.write_8(255);
+					bw.write_8(FLUXOP_SPACE);
+					write_28(delta - 249);
+					bw.write_8(249);
+				}
+			}
+			ticks_gw = newticks_gw;
+		}
+	}
+	bw.write_8(0); /* end of stream */
+	return gwdata;
+}
+
+Bytes greaseWeazleToFluxEngine(const Bytes& gwdata, nanoseconds_t clock)
+{
+	Bytes fldata;
+	ByteReader br(gwdata);
+	ByteWriter bw(fldata);
+
+    auto read_28 = [&]() {
+        return ((br.read_8() & 0xfe) >> 1)
+            | ((br.read_8() & 0xfe) << 6)
+            | ((br.read_8() & 0xfe) << 13)
+            | ((br.read_8() & 0xfe) << 20);
+    };
+
+	uint32_t ticks_gw = 0;
+	uint32_t lastevent_fl = 0;
+	uint32_t index_gw = ~0;
+
+	while (!br.eof())
+	{
+		uint8_t b = br.read_8();
+		if (!b)
+			break;
+
+		uint8_t event = 0;
+		if (b == 255)
+		{
+			switch (br.read_8())
+			{
+				case FLUXOP_INDEX:
+					index_gw = ticks_gw + read_28();
+					break;
+
+				case FLUXOP_SPACE:
+					ticks_gw += read_28();
+					break;
+
+				default:
+					Error() << "bad opcode in GreaseWeazle stream";
+			}
+		}
+		else
+		{
+			if (b < 250)
+				ticks_gw += b;
+			else
+			{
+				int delta = 250 + (b-250)*255 + br.read_8() - 1;
+				ticks_gw += delta;
+			}
+			event = F_BIT_PULSE;
+		}
+
+		if (event)
+		{
+			uint32_t index_fl = (index_gw * clock) / NS_PER_TICK;
+			uint32_t ticks_fl = (ticks_gw * clock) / NS_PER_TICK;
+			if (index_gw != ~0)
+			{
+				if (index_fl < ticks_fl)
+				{
+					uint32_t delta_fl = index_fl - lastevent_fl;
+					while (delta_fl > 0x3f)
+					{
+						bw.write_8(0x3f);
+						delta_fl -= 0x3f;
+					}
+					bw.write_8(delta_fl | F_BIT_INDEX);
+					lastevent_fl = index_fl;
+					index_gw = ~0;
+				}
+				else if (index_fl == ticks_fl)
+					event |= F_BIT_INDEX;
+			}
+
+			uint32_t delta_fl = ticks_fl - lastevent_fl;
+			while (delta_fl > 0x3f)
+			{
+				bw.write_8(0x3f);
+				delta_fl -= 0x3f;
+			}
+			bw.write_8(delta_fl | event);
+			lastevent_fl = ticks_fl;
+		}
+	}
+
+	return fldata;
+}
+
+/* Left-truncates at the first index mark, so the resulting data as aligned at
+ * the index. */
+Bytes stripPartialRotation(const Bytes& fldata)
+{
+	for (unsigned i=0; i<fldata.size(); i++)
+	{
+		uint8_t b = fldata[i];
+		if (b & F_BIT_INDEX)
+			return fldata.slice(i);
+	}
+	return fldata;
+}
+
--- a/lib/usb/greaseweazle.h
+++ b/lib/usb/greaseweazle.h
@@ -0,0 +1,203 @@
+#ifndef GREASEWEAZLE_H
+#define GREASEWEAZLE_H
+
+#define GREASEWEAZLE_VID 0x1209
+#define GREASEWEAZLE_PID 0x4d69
+
+#define EP_OUT 0x02
+#define EP_IN 0x83
+
+#define GREASEWEAZLE_VERSION 22
+
+extern Bytes fluxEngineToGreaseWeazle(const Bytes& fldata, nanoseconds_t clock);
+extern Bytes greaseWeazleToFluxEngine(const Bytes& gwdata, nanoseconds_t clock);
+extern Bytes stripPartialRotation(const Bytes& fldata);
+
+/* Copied from https://github.com/keirf/Greaseweazle/blob/master/inc/cdc_acm_protocol.h.
+ *
+ * WANING: these headers were originally defined with 'packed', which is a gccism so it's
+ * been dummied out. Don't use them expecting wire protocol structures. */
+
+#define packed /* */
+
+/*
+ * GREASEWEAZLE COMMAND SET
+ */
+
+/* CMD_GET_INFO, length=3, idx. Returns 32 bytes after ACK. */
+#define CMD_GET_INFO        0
+/* [BOOTLOADER] CMD_UPDATE, length=6, <update_len>. 
+ * Host follows with <update_len> bytes.
+ * Bootloader finally returns a status byte, 0 on success. */
+/* [MAIN FIRMWARE] CMD_UPDATE, length=10, <update_len>, 0xdeafbee3.
+ * Host follows with <update_len> bytes.
+ * Main firmware finally returns a status byte, 0 on success. */
+#define CMD_UPDATE          1
+/* CMD_SEEK, length=3, cyl#. Seek to cyl# on selected drive. */
+#define CMD_SEEK            2
+/* CMD_HEAD, length=3, head# (0=bottom) */
+#define CMD_HEAD            3
+/* CMD_SET_PARAMS, length=3+nr, idx, <nr bytes> */
+#define CMD_SET_PARAMS      4
+/* CMD_GET_PARAMS, length=4, idx, nr_bytes. Returns nr_bytes after ACK. */
+#define CMD_GET_PARAMS      5
+/* CMD_MOTOR, length=4, drive#, on/off. Turn on/off a drive motor. */
+#define CMD_MOTOR           6
+/* CMD_READ_FLUX, length=2-8. Argument is gw_read_flux.
+ * Returns flux readings until EOStream. */
+#define CMD_READ_FLUX       7
+/* CMD_WRITE_FLUX, length=2-4. Argument is gw_write_flux.
+ * Host follows with flux readings until EOStream. */
+#define CMD_WRITE_FLUX      8
+/* CMD_GET_FLUX_STATUS, length=2. Last read/write status returned in ACK. */
+#define CMD_GET_FLUX_STATUS 9
+/* CMD_SWITCH_FW_MODE, length=3, <mode> */
+#define CMD_SWITCH_FW_MODE 11
+/* CMD_SELECT, length=3, drive#. Select drive# as current unit. */
+#define CMD_SELECT         12
+/* CMD_DESELECT, length=2. Deselect current unit (if any). */
+#define CMD_DESELECT       13
+/* CMD_SET_BUS_TYPE, length=3, bus_type. Set the bus type. */
+#define CMD_SET_BUS_TYPE   14
+/* CMD_SET_PIN, length=4, pin#, level. */
+#define CMD_SET_PIN        15
+/* CMD_RESET, length=2. Reset all state to initial (power on) values. */
+#define CMD_RESET          16
+/* CMD_ERASE_FLUX, length=6. Argument is gw_erase_flux. */
+#define CMD_ERASE_FLUX     17
+/* CMD_SOURCE_BYTES, length=6. Argument is gw_sink_source_bytes. */
+#define CMD_SOURCE_BYTES   18
+/* CMD_SINK_BYTES, length=6. Argument is gw_sink_source_bytes. */
+#define CMD_SINK_BYTES     19
+#define CMD_MAX            19
+
+
+/*
+ * CMD_SET_BUS CODES
+ */
+#define BUS_NONE            0
+#define BUS_IBMPC           1
+#define BUS_SHUGART         2
+
+
+/*
+ * ACK RETURN CODES
+ */
+#define ACK_OKAY            0
+#define ACK_BAD_COMMAND     1
+#define ACK_NO_INDEX        2
+#define ACK_NO_TRK0         3
+#define ACK_FLUX_OVERFLOW   4
+#define ACK_FLUX_UNDERFLOW  5
+#define ACK_WRPROT          6
+#define ACK_NO_UNIT         7
+#define ACK_NO_BUS          8
+#define ACK_BAD_UNIT        9
+#define ACK_BAD_PIN        10
+#define ACK_BAD_CYLINDER   11
+
+
+/*
+ * CONTROL-CHANNEL COMMAND SET:
+ * We abuse SET_LINE_CODING requests over endpoint 0, stashing a command
+ * in the baud-rate field.
+ */
+#define BAUD_NORMAL        9600
+#define BAUD_CLEAR_COMMS  10000
+
+/*
+ * Flux stream opcodes. Preceded by 0xFF byte.
+ * 
+ * Argument types:
+ *  N28: 28-bit non-negative integer N, encoded as 4 bytes b0,b1,b2,b3:
+ *   b0 = (uint8_t)(1 | (N <<  1))
+ *   b1 = (uint8_t)(1 | (N >>  6))
+ *   b2 = (uint8_t)(1 | (N >> 13))
+ *   b3 = (uint8_t)(1 | (N >> 20))
+ */
+/* FLUXOP_INDEX [CMD_READ_FLUX]
+ *  Args:
+ *   +4 [N28]: ticks to index, relative to sample cursor.
+ *  Signals an index pulse in the read stream. Sample cursor is unaffected. */
+#define FLUXOP_INDEX      1
+/* FLUXOP_SPACE [CMD_READ_FLUX, CMD_WRITE_FLUX]
+ *  Args:
+ *   +4 [N28]: ticks to increment the sample cursor.
+ *  Increments the sample cursor with no intervening flux transitions. */
+#define FLUXOP_SPACE      2
+/* FLUXOP_ASTABLE [CMD_WRITE_FLUX]
+ *  Args:
+ *   +4 [N28]: astable period.
+ *  Generate regular flux transitions at specified astable period. 
+ *  Duration is specified by immediately preceding FLUXOP_SPACE opcode(s). */
+#define FLUXOP_ASTABLE    3
+
+
+/*
+ * COMMAND PACKETS
+ */
+
+/* CMD_GET_INFO, index 0 */
+#define GETINFO_FIRMWARE 0
+struct packed gw_info {
+    uint8_t fw_major;
+    uint8_t fw_minor;
+    uint8_t is_main_firmware; /* == 0 -> update bootloader */
+    uint8_t max_cmd;
+    uint32_t sample_freq;
+    uint8_t hw_model, hw_submodel;
+    uint8_t usb_speed;
+};
+extern struct gw_info gw_info;
+
+/* CMD_GET_INFO, index 1 */
+#define GETINFO_BW_STATS 1
+struct packed gw_bw_stats {
+    struct packed {
+        uint32_t bytes;
+        uint32_t usecs;
+    } min_bw, max_bw;
+};
+
+/* CMD_READ_FLUX */
+struct packed gw_read_flux {
+    /* Maximum ticks to read for (or 0, for no limit). */
+    uint32_t ticks;
+    /* Maximum index pulses to read (or 0, for no limit). */
+    uint16_t max_index;
+};
+
+/* CMD_WRITE_FLUX */
+struct packed gw_write_flux {
+    /* If non-zero, start the write at the index pulse. */
+    uint8_t cue_at_index;
+    /* If non-zero, terminate the write at the next index pulse. */
+    uint8_t terminate_at_index;
+};
+
+/* CMD_ERASE_FLUX */
+struct packed gw_erase_flux {
+    uint32_t ticks;
+};
+
+/* CMD_SINK_SOURCE_BYTES */
+struct packed gw_sink_source_bytes {
+    uint32_t nr_bytes;
+};
+
+/* CMD_{GET,SET}_PARAMS, index 0 */
+#define PARAMS_DELAYS 0
+struct packed gw_delay {
+    uint16_t select_delay; /* usec */
+    uint16_t step_delay;   /* usec */
+    uint16_t seek_settle;  /* msec */
+    uint16_t motor_delay;  /* msec */
+    uint16_t auto_off;     /* msec */
+};
+
+/* CMD_SWITCH_FW_MODE */
+#define FW_MODE_BOOTLOADER 0
+#define FW_MODE_NORMAL     1
+
+#endif
+
--- a/lib/usb/greaseweazleusb.cc
+++ b/lib/usb/greaseweazleusb.cc
@@ -0,0 +1,390 @@
+#include "globals.h"
+#include "usb.h"
+#include "protocol.h"
+#include "fluxmap.h"
+#include "bytes.h"
+#include <libusb.h>
+#include "fmt/format.h"
+#include "greaseweazle.h"
+
+#define TIMEOUT 5000
+
+static const char* gw_error(int e)
+{
+    switch (e)
+    {
+        case ACK_OKAY:           return "OK";
+        case ACK_BAD_COMMAND:    return "Bad command";
+        case ACK_NO_INDEX:       return "No index";
+        case ACK_NO_TRK0:        return "No track 0";
+        case ACK_FLUX_OVERFLOW:  return "Overflow";
+        case ACK_FLUX_UNDERFLOW: return "Underflow";
+        case ACK_WRPROT:         return "Write protected";
+        case ACK_NO_UNIT:        return "No unit";
+        case ACK_NO_BUS:         return "No bus";
+        case ACK_BAD_UNIT:       return "Invalid unit";
+        case ACK_BAD_PIN:        return "Invalid pin";
+        case ACK_BAD_CYLINDER:   return "Invalid cylinder";
+        default:                 return "Unknown error";
+    }
+}
+
+class GreaseWeazleUsb : public USB
+{
+private:
+    uint8_t _readbuffer[4096];
+    int _readbuffer_ptr = 0;
+    int _readbuffer_fill = 0;
+
+    void read_bytes(uint8_t* buffer, int len)
+    {
+        while (len > 0)
+        {
+            if (_readbuffer_ptr < _readbuffer_fill)
+            {
+                int buffered = std::min(len, _readbuffer_fill - _readbuffer_ptr);
+                memcpy(buffer, _readbuffer + _readbuffer_ptr, buffered);
+                _readbuffer_ptr += buffered;
+                buffer += buffered;
+                len -= buffered;
+            }
+
+            if (len == 0)
+                break;
+
+            int actual;
+            int rc = libusb_bulk_transfer(_device, EP_IN,
+                _readbuffer, sizeof(_readbuffer),
+                &actual, TIMEOUT);
+            if (rc < 0)
+                Error() << "failed to receive command reply: " << usberror(rc);
+
+            _readbuffer_fill = actual;
+            _readbuffer_ptr = 0;
+        }
+    }
+
+    void read_bytes(Bytes& bytes)
+    {
+        read_bytes(bytes.begin(), bytes.size());
+    }
+
+    Bytes read_bytes(unsigned len)
+    {
+        Bytes b(len);
+        read_bytes(b);
+        return b;
+    }
+
+    uint8_t read_byte()
+    {
+        uint8_t b;
+        read_bytes(&b, 1);
+        return b;
+    }
+
+    uint32_t read_28()
+    {
+        return ((read_byte() & 0xfe) >> 1)
+            | ((read_byte() & 0xfe) << 6)
+            | ((read_byte() & 0xfe) << 13)
+            | ((read_byte() & 0xfe) << 20);
+    }
+
+    void write_bytes(const uint8_t* buffer, int len)
+    {
+        while (len > 0)
+        {
+            int actual;
+            int rc = libusb_bulk_transfer(_device, EP_OUT, (uint8_t*)buffer, len, &actual, 0);
+            if (rc < 0)
+                Error() << "failed to send command: " << usberror(rc);
+
+            buffer += actual;
+            len -= actual;
+        }
+    }
+
+    void write_bytes(const Bytes& bytes)
+    {
+        write_bytes(bytes.cbegin(), bytes.size());
+    }
+
+    void do_command(const Bytes& command)
+    {
+        write_bytes(command);
+
+        uint8_t buffer[2];
+        read_bytes(buffer, sizeof(buffer));
+
+        if (buffer[0] != command[0])
+            Error() << fmt::format("command returned garbage (0x{:x} != 0x{:x} with status 0x{:x})",
+                buffer[0], command[0], buffer[1]);
+        if (buffer[1])
+            Error() << fmt::format("GreaseWeazle error: {}", gw_error(buffer[1]));
+    }
+
+public:
+    GreaseWeazleUsb(libusb_device_handle* device)
+    {
+        _device = device;
+
+        /* Configure the device. */
+
+        int i;
+        int cfg = -1;
+        libusb_get_configuration(_device, &cfg);
+        if (cfg != 1)
+        {
+            i = libusb_set_configuration(_device, 1);
+            if (i < 0)
+                Error() << "the GreaseWeazle would not accept configuration: " << usberror(i);
+        }
+
+        /* Detach the existing kernel serial port driver, if there is one, and claim it ourselves. */
+
+        for (int i = 0; i < 2; i++)
+        {
+            if (libusb_kernel_driver_active(_device, i))
+                libusb_detach_kernel_driver(_device, i);
+            int rc = libusb_claim_interface(_device, i);
+            if (rc < 0)
+                Error() << "unable to claim interface: " << libusb_error_name(rc);
+        }
+
+        int version = getVersion();
+        if (version != GREASEWEAZLE_VERSION)
+            Error() << "your GreaseWeazle firmware is at version " << version
+                    << " but the client is for version " << GREASEWEAZLE_VERSION
+                    << "; please upgrade";
+
+        /* Configure the hardware. */
+
+        do_command({ CMD_SET_BUS_TYPE, 3, BUS_IBMPC });
+    }
+
+    int getVersion()
+    {
+        do_command({ CMD_GET_INFO, 3, GETINFO_FIRMWARE });
+
+        Bytes response = read_bytes(32);
+        ByteReader br(response);
+
+        br.seek(4);
+        nanoseconds_t freq = br.read_le32();
+        _clock = 1000000000 / freq;
+
+        br.seek(0);
+        return br.read_be16();
+    }
+
+    void recalibrate()
+    {
+        seek(0);
+    }
+    
+    void seek(int track)
+    {
+        do_command({ CMD_SEEK, 3, (uint8_t)track });
+    }
+    
+    nanoseconds_t getRotationalPeriod(int hardSectorCount)
+    {
+        if (hardSectorCount != 0)
+            Error() << "hard sectors are currently unsupported on the GreaseWeazel";
+
+        /* The GreaseWeazle doesn't have a command to fetch the period directly,
+         * so we have to do a flux read. */
+
+        do_command({ CMD_READ_FLUX, 2 });
+
+        uint32_t ticks_gw = 0;
+        uint32_t firstindex = ~0;
+        uint32_t secondindex = ~0;
+        for (;;)
+        {
+            uint8_t b = read_byte();
+            if (!b)
+                break;
+
+            if (b == 255)
+            {
+                switch (read_byte())
+                {
+                    case FLUXOP_INDEX:
+                    {
+                        uint32_t index = read_28() + ticks_gw;
+                        if (firstindex == ~0)
+                            firstindex = index;
+                        else if (secondindex == ~0)
+                            secondindex = index;
+                        break;
+                    }
+
+                    case FLUXOP_SPACE:
+                        read_bytes(4);
+                        break;
+
+                    default:
+                        Error() << "bad opcode in GreaseWeazle stream";
+                }
+            }
+            else
+            {
+                if (b < 250)
+                    ticks_gw += b;
+                else
+                {
+                    int delta = 250 + (b-250)*255 + read_byte() - 1;
+                    ticks_gw += delta;
+                }
+            }
+        }
+
+        if (secondindex == ~0)
+            Error() << "unable to determine disk rotational period (is a disk in the drive?)";
+        do_command({ CMD_GET_FLUX_STATUS, 2 });
+
+        _revolutions = (nanoseconds_t)(secondindex - firstindex) * _clock;
+        return _revolutions;
+    }
+    
+    void testBulkWrite()
+    {
+        const int LEN = 10*1024*1024;
+        Bytes cmd(6);
+        ByteWriter bw(cmd);
+        bw.write_8(CMD_SINK_BYTES);
+        bw.write_8(cmd.size());
+        bw.write_le32(LEN);
+        do_command(cmd);
+
+        Bytes junk(LEN);
+		double start_time = getCurrentTime();
+        write_bytes(LEN);
+        read_bytes(1);
+		double elapsed_time = getCurrentTime() - start_time;
+
+		std::cout << "Transferred "
+				  << LEN
+				  << " bytes from PC -> GreaseWeazle in "
+				  << int(elapsed_time * 1000.0)
+				  << " ms ("
+				  << int((LEN / 1024.0) / elapsed_time)
+				  << " kB/s)"
+				  << std::endl;
+    }
+    
+    void testBulkRead()
+    {
+        const int LEN = 10*1024*1024;
+        Bytes cmd(6);
+        ByteWriter bw(cmd);
+        bw.write_8(CMD_SOURCE_BYTES);
+        bw.write_8(cmd.size());
+        bw.write_le32(LEN);
+        do_command(cmd);
+
+		double start_time = getCurrentTime();
+        read_bytes(LEN);
+		double elapsed_time = getCurrentTime() - start_time;
+
+		std::cout << "Transferred "
+				  << LEN
+				  << " bytes from GreaseWeazle -> PC in "
+				  << int(elapsed_time * 1000.0)
+				  << " ms ("
+				  << int((LEN / 1024.0) / elapsed_time)
+				  << " kB/s)"
+				  << std::endl;
+    }
+
+    Bytes read(int side, bool synced, nanoseconds_t readTime, nanoseconds_t hardSectorThreshold)
+    {
+        if (hardSectorThreshold != 0)
+            Error() << "hard sectors are currently unsupported on the GreaseWeazel";
+
+        int revolutions = (readTime+_revolutions-1) / _revolutions;
+
+        do_command({ CMD_HEAD, 3, (uint8_t)side });
+
+        {
+            Bytes cmd(4);
+            cmd.writer()
+                .write_8(CMD_READ_FLUX)
+                .write_8(cmd.size())
+                .write_le32(revolutions + (synced ? 1 : 0));
+            do_command(cmd);
+        }
+
+		Bytes buffer;
+        ByteWriter bw(buffer);
+        for (;;)
+        {
+            uint8_t b = read_byte();
+            if (!b)
+                break;
+            bw.write_8(b);
+        }
+
+        do_command({ CMD_GET_FLUX_STATUS, 2 });
+
+        Bytes fldata = greaseWeazleToFluxEngine(buffer, _clock);
+        if (synced)
+            fldata = stripPartialRotation(fldata);
+        return fldata;
+    }
+    
+    void write(int side, const Bytes& fldata, nanoseconds_t hardSectorThreshold)
+    {
+        if (hardSectorThreshold != 0)
+            Error() << "hard sectors are currently unsupported on the GreaseWeazel";
+
+        do_command({ CMD_HEAD, 3, (uint8_t)side });
+        do_command({ CMD_WRITE_FLUX, 3, 1 });
+        write_bytes(fluxEngineToGreaseWeazle(fldata, _clock));
+        read_byte(); /* synchronise */
+
+        do_command({ CMD_GET_FLUX_STATUS, 2 });
+    }
+    
+    void erase(int side, nanoseconds_t hardSectorThreshold)
+    {
+        if (hardSectorThreshold != 0)
+            Error() << "hard sectors are currently unsupported on the GreaseWeazel";
+
+        do_command({ CMD_HEAD, 3, (uint8_t)side });
+
+        Bytes cmd(6);
+        ByteWriter bw(cmd);
+        bw.write_8(CMD_ERASE_FLUX);
+        bw.write_8(cmd.size());
+        bw.write_le32(200e6 / _clock);
+        do_command(cmd);
+        read_byte(); /* synchronise */
+
+        do_command({ CMD_GET_FLUX_STATUS, 2 });
+    }
+    
+    void setDrive(int drive, bool high_density, int index_mode)
+    {
+        do_command({ CMD_SELECT, 3, (uint8_t)drive });
+        do_command({ CMD_MOTOR, 4, (uint8_t)drive, 1 });
+        do_command({ CMD_SET_PIN, 4, 2, (uint8_t)(high_density ? 0 : 1) });
+    }
+
+    void measureVoltages(struct voltages_frame* voltages)
+    { Error() << "unsupported operation on the GreaseWeazle"; }
+
+private:
+    nanoseconds_t _clock;
+    nanoseconds_t _revolutions;
+};
+
+USB* createGreaseWeazleUsb(libusb_device_handle* device)
+{
+    return new GreaseWeazleUsb(device);
+}
+
+// vim: sw=4 ts=4 et
+
--- a/lib/usb/usb.cc
+++ b/lib/usb/usb.cc
@@ -6,6 +6,7 @@
 #include "bytes.h"
 #include <libusb.h>
 #include "fmt/format.h"
+#include "greaseweazle.h"

 FlagGroup usbFlags;

@@ -19,6 +20,7 @@ static USB* usb = NULL;
 enum
 {
 	DEV_FLUXENGINE,
+	DEV_GREASEWEAZLE,
 };

 struct CandidateDevice
@@ -42,11 +44,28 @@ static const char* device_type(int i)
 	switch (i)
 	{
 		case DEV_FLUXENGINE: return "FluxEngine";
+		case DEV_GREASEWEAZLE: return "GreaseWeazle";
 		default: assert(false);
 	}
 	return NULL;
 }

+static const std::string get_serial_number(libusb_device* device, libusb_device_descriptor* desc)
+{
+	std::string serial;
+
+	libusb_device_handle* handle;
+	if (libusb_open(device, &handle) == 0)
+	{
+		unsigned char buffer[64];
+		libusb_get_string_descriptor_ascii(handle, desc->iSerialNumber, buffer, sizeof(buffer));
+		serial = (const char*) buffer;
+		libusb_close(handle);
+	}
+
+	return serial;
+}
+
 static std::map<std::string, std::unique_ptr<CandidateDevice>> get_candidates(libusb_device** devices, int numdevices)
 {
 	std::map<std::string, std::unique_ptr<CandidateDevice>> candidates;
@@ -56,22 +75,24 @@ static std::map<std::string, std::unique_ptr<CandidateDevice>> get_candidates(li
 		candidate->device = devices[i];
 		(void) libusb_get_device_descriptor(devices[i], &candidate->desc);

-		if ((candidate->desc.idVendor == FLUXENGINE_VID) && (candidate->desc.idProduct == FLUXENGINE_PID))
+		uint32_t id = (candidate->desc.idVendor << 16) | candidate->desc.idProduct;
+		switch (id)
 		{
-			candidate->type = DEV_FLUXENGINE;
-			candidate->serial = "";
-
-			libusb_device_handle* handle;
-			if (libusb_open(candidate->device, &handle) == 0)
+			case (FLUXENGINE_VID<<16) | FLUXENGINE_PID:
 			{
-				unsigned char buffer[64];
-				libusb_get_string_descriptor_ascii(handle,
-					candidate->desc.iSerialNumber, buffer, sizeof(buffer));
-				candidate->serial = (const char*) buffer;
-				libusb_close(handle);
+				candidate->type = DEV_FLUXENGINE;
+				candidate->serial = get_serial_number(candidate->device, &candidate->desc);
+				candidates[candidate->serial] = std::move(candidate);
+				break;
 			}

-			candidates[candidate->serial] = std::move(candidate);
+			case (GREASEWEAZLE_VID<<16) | GREASEWEAZLE_PID:
+			{
+				candidate->type = DEV_GREASEWEAZLE;
+				candidate->serial = get_serial_number(candidate->device, &candidate->desc);
+				candidates[candidate->serial] = std::move(candidate);
+				break;
+			}
 		}
 	}

@@ -86,7 +107,16 @@ static void open_device(CandidateDevice& candidate)
 		Error() << "cannot open USB device: " << libusb_strerror((libusb_error) i);
 	
 	std::cout << "Using " << device_type(candidate.type) << " with serial number " << candidate.serial << '\n';
-	usb = createFluxengineUsb(handle);
+	switch (candidate.type)
+	{
+		case DEV_FLUXENGINE:
+			usb = createFluxengineUsb(handle);
+			break;
+
+		case DEV_GREASEWEAZLE:
+			usb = createGreaseWeazleUsb(handle);
+			break;
+	}
 }

 static CandidateDevice& select_candidate(const std::map<std::string, std::unique_ptr<CandidateDevice>>& devices)
--- a/lib/usb/usb.h
+++ b/lib/usb/usb.h
@@ -15,12 +15,14 @@ public:
 	virtual int getVersion() = 0;
 	virtual void recalibrate() = 0;
 	virtual void seek(int track) = 0;
-	virtual nanoseconds_t getRotationalPeriod() = 0;
+	virtual nanoseconds_t getRotationalPeriod(int hardSectorCount) = 0;
 	virtual void testBulkWrite() = 0;
 	virtual void testBulkRead() = 0;
-	virtual Bytes read(int side, bool synced, nanoseconds_t readTime) = 0;
-	virtual void write(int side, const Bytes& bytes) = 0;
-	virtual void erase(int side) = 0;
+	virtual Bytes read(int side, bool synced, nanoseconds_t readTime,
+	                   nanoseconds_t hardSectorThreshold) = 0;
+	virtual void write(int side, const Bytes& bytes,
+	                   nanoseconds_t hardSectorThreshold) = 0;
+	virtual void erase(int side, nanoseconds_t hardSectorThreshold) = 0;
 	virtual void setDrive(int drive, bool high_density, int index_mode) = 0;
 	virtual void measureVoltages(struct voltages_frame* voltages) = 0;

@@ -34,22 +36,27 @@ extern FlagGroup usbFlags;
 extern USB& getUsb();

 extern USB* createFluxengineUsb(libusb_device_handle* device);
+extern USB* createGreaseWeazleUsb(libusb_device_handle* device);

 static inline int usbGetVersion()     { return getUsb().getVersion(); }
 static inline void usbRecalibrate()   { getUsb().recalibrate(); }
 static inline void usbSeek(int track) { getUsb().seek(track); }
 static inline void usbTestBulkWrite() { getUsb().testBulkWrite(); }
 static inline void usbTestBulkRead()  { getUsb().testBulkRead(); }
-static inline void usbErase(int side) { getUsb().erase(side); }

-static inline nanoseconds_t usbGetRotationalPeriod()
-{ return getUsb().getRotationalPeriod(); }
+static inline void usbErase(int side, nanoseconds_t hardSectorThreshold)
+{ getUsb().erase(side, hardSectorThreshold); }

-static inline Bytes usbRead(int side, bool synced, nanoseconds_t readTime)
-{ return getUsb().read(side, synced, readTime); }
+static inline nanoseconds_t usbGetRotationalPeriod(int hardSectorCount)
+{ return getUsb().getRotationalPeriod(hardSectorCount); }

-static inline void usbWrite(int side, const Bytes& bytes)
-{ getUsb().write(side, bytes); }
+static inline Bytes usbRead(int side, bool synced, nanoseconds_t readTime,
+                            nanoseconds_t hardSectorThreshold)
+{ return getUsb().read(side, synced, readTime, hardSectorThreshold); }
+
+static inline void usbWrite(int side, const Bytes& bytes,
+                            nanoseconds_t hardSectorThreshold)
+{ getUsb().write(side, bytes, hardSectorThreshold); }

 static inline void usbSetDrive(int drive, bool high_density, int index_mode)
 { getUsb().setDrive(drive, high_density, index_mode); }
--- a/lib/writer.cc
+++ b/lib/writer.cc
@@ -43,6 +43,11 @@ void setWriterDefaultInput(const std::string& input)
    ::input.set(input);
 }

+void setWriterHardSectorCount(int sectorCount)
+{
+	setHardwareFluxSinkHardSectorCount(sectorCount);
+}
+
 static SectorSet readSectorsFromFile(const ImageSpec& spec)
 {
 	return ImageReader::create(spec)->readImage();
--- a/lib/writer.h
+++ b/lib/writer.h
@@ -11,6 +11,7 @@ class Geometry;

 extern void setWriterDefaultDest(const std::string& dest);
 extern void setWriterDefaultInput(const std::string& input);
+extern void setWriterHardSectorCount(int sectorCount);

 extern void writeTracks(const std::function<std::unique_ptr<Fluxmap>(int track, int side)> producer);

--- a/mkninja.sh
+++ b/mkninja.sh
@@ -199,6 +199,8 @@ buildlibrary libbackend.a \
    lib/fluxsource/streamfluxsource.cc \
    lib/usb/usb.cc \
    lib/usb/fluxengineusb.cc \
+    lib/usb/greaseweazle.cc \
+    lib/usb/greaseweazleusb.cc \
    lib/globals.cc \
    lib/hexdump.cc \
    lib/ldbs.cc \
@@ -210,6 +212,7 @@ buildlibrary libbackend.a \
    lib/writer.cc \

 buildlibrary libfrontend.a \
+	src/fe-analysedriveresponse.cc \
    src/fe-cwftoflux.cc \
    src/fe-erase.cc \
    src/fe-fluxtoau.cc \
@@ -271,6 +274,7 @@ buildsimpleprogram brother240tool \
    libemu.a \
    libfmt.a \

+runtest amiga-test          tests/amiga.cc
 runtest bitaccumulator-test tests/bitaccumulator.cc
 runtest bytes-test          tests/bytes.cc
 runtest compression-test    tests/compression.cc
@@ -278,6 +282,6 @@ runtest dataspec-test       tests/dataspec.cc
 runtest flags-test          tests/flags.cc
 runtest fluxpattern-test    tests/fluxpattern.cc
 runtest fmmfm-test          tests/fmmfm.cc
+runtest greaseweazle-test   tests/greaseweazle.cc
 runtest kryoflux-test       tests/kryoflux.cc
 runtest ldbs-test           tests/ldbs.cc
-runtest amiga-test          tests/amiga.cc
--- a/protocol.h
+++ b/protocol.h
@@ -3,7 +3,7 @@

 enum 
 {
-    FLUXENGINE_VERSION = 14,
+    FLUXENGINE_VERSION = 15,

    FLUXENGINE_VID = 0x1209,
    FLUXENGINE_PID = 0x6e00,
@@ -48,7 +48,7 @@ enum
    F_FRAME_GET_VERSION_REPLY,    /* version_frame */
    F_FRAME_SEEK_CMD,             /* seek_frame */
    F_FRAME_SEEK_REPLY,           /* any_frame */
-    F_FRAME_MEASURE_SPEED_CMD,    /* any_frame */
+    F_FRAME_MEASURE_SPEED_CMD,    /* measurespeed_frame */
    F_FRAME_MEASURE_SPEED_REPLY,  /* speed_frame */
    F_FRAME_BULK_WRITE_TEST_CMD,   /* any_frame */
    F_FRAME_BULK_WRITE_TEST_REPLY, /* any_frame */
@@ -125,6 +125,12 @@ struct seek_frame
    uint8_t track;
 };

+struct measurespeed_frame 
+{
+    struct frame_header f;
+	uint8_t hard_sector_count;
+};
+
 struct speed_frame
 {
    struct frame_header f;
@@ -137,6 +143,7 @@ struct read_frame
    uint8_t side;
    uint8_t synced;
    uint16_t milliseconds;
+    uint8_t hardsec_threshold_ms;
 };

 struct write_frame
@@ -144,12 +151,14 @@ struct write_frame
    struct frame_header f;
    uint8_t side;
    uint32_t bytes_to_write;
+    uint8_t hardsec_threshold_ms;
 };

 struct erase_frame
 {
    struct frame_header f;
    uint8_t side;
+    uint8_t hardsec_threshold_ms;
 };

 struct set_drive_frame
--- a/scripts/analysedriveresponse.py
+++ b/scripts/analysedriveresponse.py
@@ -0,0 +1,36 @@
+import numpy
+import matplotlib.pyplot as plt
+import matplotlib.animation as animation
+
+TICK_FREQUENCY = 12e6
+TICKS_PER_US = TICK_FREQUENCY / 1e6
+print(TICKS_PER_US)
+
+# Load data.
+data = numpy.loadtxt(open("driveresponse.csv", "rb"), delimiter=",", skiprows=1)
+
+labels = data[:, 0]
+frequencies = data[:, 1:]
+
+# Scale the frequencies.
+def scaled(row):
+    m = row.mean()
+    if m != 0:
+        return row / m
+    else:
+        return row
+
+scaledfreq = numpy.array([scaled(row) for row in frequencies])
+
+# Create new Figure with black background
+fig = plt.figure(figsize=(8, 8), facecolor='#aaa')
+
+plt.imshow(scaledfreq, extent=[0, 512/TICKS_PER_US, labels[0], labels[-1]], cmap='jet',
+           vmin=0, vmax=1, origin='lower', aspect='auto')
+plt.colorbar()
+plt.ylabel("Interval period (us)")
+plt.xlabel("Response (us)")
+plt.grid(True, dashes=(2, 2))
+plt.show()
+
+plt.show()
--- a/src/fe-analysedriveresponse.cc
+++ b/src/fe-analysedriveresponse.cc
@@ -0,0 +1,135 @@
+#include "globals.h"
+#include "flags.h"
+#include "usb/usb.h"
+#include "dataspec.h"
+#include "fluxmap.h"
+#include "decoders/fluxmapreader.h"
+#include "writer.h"
+#include "protocol.h"
+#include "fmt/format.h"
+#include <fstream>
+
+static FlagGroup flags = {
+	&usbFlags,
+};
+
+static DataSpecFlag dest(
+    { "--dest", "-d" },
+    "destination to analyse",
+    ":d=0:t=0:s=0");
+
+static DoubleFlag minInterval(
+	{ "--min-interval-us" },
+	"Minimum pulse interval",
+	2.0);
+
+static DoubleFlag maxInterval(
+	{ "--max-interval-us" },
+	"Maximum pulse interval",
+	10.0);
+
+static DoubleFlag intervalStep(
+	{ "--interval-step-us" },
+	"Interval step, approximately",
+	0.2);
+
+static StringFlag writeCsv(
+	{ "--write-csv" },
+	"Write detailed CSV data",
+	"driveresponse.csv");
+
+int mainAnalyseDriveResponse(int argc, const char* argv[])
+{
+    flags.parseFlags(argc, argv);
+
+    FluxSpec spec(dest);
+	if (spec.locations.size() != 1)
+		Error() << "the destination dataspec must contain exactly one track (two sides count as two tracks)";
+
+    usbSetDrive(spec.drive, false, F_INDEX_REAL);
+	usbSeek(spec.locations[0].track);
+
+	std::cout << "Measuring rotational speed...\n";
+    nanoseconds_t period = usbGetRotationalPeriod(0);
+	if (period == 0)
+		Error() << "Unable to measure rotational speed (try fluxengine rpm).";
+
+	std::ofstream csv;
+	if (writeCsv.get() != "")
+		csv.open(writeCsv);
+
+	for (double interval = minInterval; interval<maxInterval; interval += intervalStep)
+	{
+		unsigned ticks = (unsigned) (interval * TICKS_PER_US);
+		std::cout << fmt::format("Interval {:.2f}: ", ticks * US_PER_TICK);
+		std::cout << std::flush;
+
+		std::vector<int> frequencies(512);
+
+		if (interval >= 2.0)
+		{
+			/* Write the test pattern. */
+
+			Fluxmap outFluxmap;
+			while (outFluxmap.duration() < period)
+			{
+				outFluxmap.appendInterval(ticks);
+				outFluxmap.appendPulse();
+			}
+			usbWrite(spec.locations[0].side, outFluxmap.rawBytes(), 0);
+
+			/* Read the test pattern in again. */
+
+			Fluxmap inFluxmap;
+			inFluxmap.appendBytes(usbRead(spec.locations[0].side, true, period, 0));
+
+			/* Compute histogram. */
+
+			FluxmapReader fmr(inFluxmap);
+			fmr.seek((double)period*0.1); /* skip first 10% and last 10% as contains junk */
+			fmr.findEvent(F_BIT_PULSE);
+			while (fmr.tell().ns() < ((double)period*0.9))
+			{
+				unsigned ticks = fmr.findEvent(F_BIT_PULSE);
+				if (ticks < frequencies.size())
+					frequencies[ticks]++;
+			}
+		}
+
+		/* Compute standard deviation. */
+
+		int sum = 0;
+		int prod = 0;
+		for (int i=0; i<frequencies.size(); i++)
+		{
+			sum += frequencies[i];
+			prod += i * frequencies[i];
+		}
+		if (sum == 0)
+			std::cout << "failed\n";
+		else
+		{
+			double mean = prod / sum;
+			double sqsum = 0;
+			for (int i=0; i<frequencies.size(); i++)
+			{
+				double dx = (double)i - mean;
+				sqsum += (double)frequencies[i] * dx * dx;
+			}
+			double stdv = sqrt(sqsum / sum);
+			std::cout << fmt::format("{:.4f} {:.4f}\n", stdv, mean/TICKS_PER_US);
+
+		}
+
+		if (writeCsv.get() != "")
+		{
+			csv << interval;
+			for (int i : frequencies)
+				csv << "," << i;
+			csv << '\n';
+		}
+	}
+
+    return 0;
+}
+
--- a/src/fe-readmicropolis.cc
+++ b/src/fe-readmicropolis.cc
@@ -16,7 +16,7 @@ int mainReadMicropolis(int argc, const char* argv[])
 {
 	setReaderDefaultSource(":t=0-76");
 	setReaderDefaultOutput("micropolis.img");
-	setReaderRevolutions(21); /* 17 index holes * 1.25 */
+	setReaderHardSectorCount(16);
 	flags.parseFlags(argc, argv);

 	MicropolisDecoder decoder;
--- a/src/fe-rpm.cc
+++ b/src/fe-rpm.cc
@@ -13,13 +13,18 @@ static DataSpecFlag source(
    "source for data",
    ":d=0:t=0:s=0");

+static IntFlag hardSectorCount(
+    { "--hard-sector-count" },
+    "number of hard sectors on the disk (0=soft sectors)",
+    0);
+
 int mainRpm(int argc, const char* argv[])
 {
    flags.parseFlags(argc, argv);

    FluxSpec spec(source);
    usbSetDrive(spec.drive, false, F_INDEX_REAL);
-    nanoseconds_t period = usbGetRotationalPeriod();
+    nanoseconds_t period = usbGetRotationalPeriod(hardSectorCount);
    if (period != 0)
        std::cout << "Rotational period is " << period/1000000 << " ms (" << 60e9/period << " rpm)" << std::endl;
    else
--- a/src/fluxengine.cc
+++ b/src/fluxengine.cc
@@ -2,6 +2,7 @@

 typedef int command_cb(int agrc, const char* argv[]);

+extern command_cb mainAnalyseDriveResponse;
 extern command_cb mainErase;
 extern command_cb mainConvertCwfToFlux;
 extern command_cb mainConvertFluxToAu;
@@ -50,6 +51,7 @@ struct Command
 static command_cb mainRead;
 static command_cb mainWrite;
 static command_cb mainConvert;
+static command_cb mainAnalyse;
 static command_cb mainTest;

 static std::vector<Command> commands =
@@ -57,6 +59,7 @@ static std::vector<Command> commands =
    { "erase",             mainErase,             "Permanently but rapidly erases some or all of a disk." },
    { "convert",           mainConvert,           "Converts various types of data file.", },
    { "inspect",           mainInspect,           "Low-level analysis and inspection of a disk." },
+	{ "analyse",           mainAnalyse,           "Disk and drive analysis tools." },
    { "read",              mainRead,              "Reads a disk, producing a sector image.", },
    { "rpm",               mainRpm,               "Measures the disk rotational speed.", },
    { "seek",              mainSeek,              "Moves the disk head.", },
@@ -107,6 +110,11 @@ static std::vector<Command> convertables =
 	{ "image",         mainConvertImage,     "Converts one disk image to another.", },
 };

+static std::vector<Command> analysables =
+{
+	{ "driveresponse", mainAnalyseDriveResponse, "Measures the drive's ability to read and write pulses.", }
+};
+
 static std::vector<Command> testables =
 {
    { "bandwidth",     mainTestBandwidth, "Measures your USB bandwidth.", },
@@ -153,6 +161,9 @@ static int mainWrite(int argc, const char* argv[])
 static int mainConvert(int argc, const char* argv[])
 { return mainExtended(convertables, "convert", argc, argv); }

+static int mainAnalyse(int argc, const char* argv[])
+{ return mainExtended(analysables, "analyse", argc, argv); }
+
 static int mainTest(int argc, const char* argv[])
 { return mainExtended(testables, "test", argc, argv); }

--- a/tests/greaseweazle.cc
+++ b/tests/greaseweazle.cc
@@ -0,0 +1,109 @@
+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include "globals.h"
+#include "fluxmap.h"
+#include "lib/usb/greaseweazle.h"
+
+static Bytes operator + (const Bytes& left, const Bytes& right)
+{
+    Bytes output;
+    ByteWriter bw(output);
+    bw += left;
+    bw += right;
+    return output;
+}
+
+static Bytes operator * (const Bytes& left, size_t count)
+{
+    Bytes output;
+    ByteWriter bw(output);
+    while (count--)
+        bw += left;
+    return output;
+}
+
+#define E28(val) \
+	(1 | (val<<1) & 0xff), \
+	(1 | (val>>6) & 0xff), \
+	(1 | (val>>13) & 0xff), \
+	(1 | (val>>20) & 0xff)
+
+
+static void test_convert(const Bytes& gwbytes, const Bytes& flbytes)
+{
+	Bytes gwtoflbytes = greaseWeazleToFluxEngine(gwbytes, 2*NS_PER_TICK);
+	Bytes fltogwbytes = fluxEngineToGreaseWeazle(flbytes, 2*NS_PER_TICK);
+
+    if (gwtoflbytes != flbytes)
+    {
+		std::cout << "GreaseWeazle to FluxEngine conversion failed.\n";
+        std::cout << "GreaseWeazle bytes:" << std::endl;
+        hexdump(std::cout, gwbytes);
+        std::cout << std::endl << "Produced this:" << std::endl;
+        hexdump(std::cout, gwtoflbytes);
+        std::cout << std::endl << "Expected this:" << std::endl;
+        hexdump(std::cout, flbytes);
+        abort();
+    }
+
+    if (fltogwbytes != gwbytes)
+    {
+		std::cout << "FluxEngine to GreaseWeazle conversion failed.\n";
+        std::cout << "FluxEngine bytes:" << std::endl;
+        hexdump(std::cout, flbytes);
+        std::cout << std::endl << "Produced this:" << std::endl;
+        hexdump(std::cout, fltogwbytes);
+        std::cout << std::endl << "Expected this:" << std::endl;
+        hexdump(std::cout, gwbytes);
+        abort();
+    }
+}
+
+static void test_conversions()
+{
+	/* Simple one-byte intervals. */
+
+	test_convert(
+		Bytes{ 1, 1, 1, 1, 0 },
+		Bytes{ 0x82, 0x82, 0x82, 0x82 }
+	);
+
+	/* Larger one-byte intervals. */
+
+	test_convert(
+		Bytes{ 32, 0 },
+		Bytes{ 0x3f, 0x81 }
+	);
+
+	test_convert(
+		Bytes{ 64, 0 },
+		Bytes{ 0x3f, 0x3f, 0x82 }
+	);
+
+	test_convert(
+		Bytes{ 128, 0 },
+		Bytes{ 0x3f, 0x3f, 0x3f, 0x3f, 0x84 }
+	);
+
+	/* Two-byte intervals. */
+
+	test_convert(
+		Bytes{ 250, 1, 0 },
+		Bytes{ 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0xbb }
+	);
+
+	/* Very long intervals. */
+
+	test_convert(
+		Bytes{ 255, FLUXOP_SPACE, E28(2048 - 249), 249, 0 },
+		Bytes{ 0x3f }*0x41 + Bytes{ 0x81 }
+	);
+}
+
+int main(int argc, const char* argv[])
+{
+	test_conversions();
+    return 0;
+}
+
Author	SHA1	Message	Date
David Given	b570e44ee4	Merge pull request #211 from davidgiven/patch-1 Add missing zlib dependency.	2021-01-11 11:59:22 +01:00
David Given	b115d0b55b	Add missing zlib dependency. Fixes: #190	2021-01-11 11:57:59 +01:00
David Given	529488cab0	Typo fix.	2021-01-10 13:55:55 +01:00
David Given	b2429a7ca3	Typo fixes.	2021-01-10 12:34:55 +01:00
David Given	0bce12d3b4	Merge pull request #210 from davidgiven/analysis Add the drive response documentation page.	2021-01-10 12:26:09 +01:00
David Given	75f557cb18	Add the drive response documentation page.	2021-01-10 12:15:37 +01:00
David Given	035dd1fad1	Merge pull request #209 from davidgiven/analyse Add an analysis tool for checking drive response.	2021-01-10 02:01:33 +01:00
David Given	d2df79a665	Remember to get rid of the junk comments!	2021-01-10 01:09:35 +01:00
David Given	103e0a13bb	Typo fix.	2021-01-10 01:06:13 +01:00
David Given	d1b5eec84a	Add the analysis tool and Python script for drawing the results.	2021-01-10 00:51:43 +01:00
David Given	6b1e6b31ed	Add initial version of the response analysis tool.	2021-01-09 13:42:37 +01:00
David Given	f6f6db913e	Merge pull request #208 from davidgiven/greaseweazel Add client support for the GreaseWeazle.	2021-01-09 01:12:10 +01:00
David Given	ec0a6416fd	Update documentation.	2021-01-09 00:52:16 +01:00
David Given	1787402be9	...and again.	2021-01-09 00:45:27 +01:00
David Given	5f6d99f138	Attempt that fix again.	2021-01-09 00:37:37 +01:00
David Given	d1e2b0d1f8	Fix an issue with old C++ compilers and designated initialisers.	2021-01-09 00:29:46 +01:00
David Given	c2c51bbe33	Fix after merge.	2021-01-09 00:02:14 +01:00
David Given	bb806e3853	Merge from master.	2021-01-08 23:23:50 +01:00
David Given	a11d0e75c8	Merge pull request #200 from ejona86/hard-sectors Add firmware support for hard sectors	2021-01-08 23:20:40 +01:00
David Given	5406ff0ea3	Typo fix.	2021-01-08 23:14:51 +01:00
David Given	c88317b44a	Document how to make things work on Windows.	2021-01-08 23:13:27 +01:00
David Given	6898062d66	Document Windows horror.	2021-01-08 21:37:44 +01:00
David Given	6e1f264e6a	Make --sync-with-index and --revolutions work properly on the GreaseWeazle.	2021-01-08 21:36:50 +01:00
David Given	082be14232	Add GreaseWeazle support for --high-density.	2021-01-08 21:20:33 +01:00
David Given	231aa44d03	The clock compensation factor for Mac doesn't seem to be needed?	2021-01-08 01:14:39 +01:00
David Given	cdb12f35d4	Update documentation to mention the GreaseWeazle.	2021-01-07 23:03:34 +01:00
David Given	e831ee8b44	Add erase support.	2021-01-07 22:46:11 +01:00
David Given	40e9a6082f	Remove that 'packed' thing.	2021-01-07 22:17:19 +01:00
David Given	53cec292d0	Refactor the GreaseWeazle converter to allow it to be tested.	2021-01-07 22:06:45 +01:00
David Given	3f85309ee5	Commit non-functioning GreaseWeazle write support.	2021-01-07 20:42:06 +01:00
David Given	70944f8521	Reading flux now correctly handles index markers.	2021-01-07 20:02:51 +01:00
David Given	2ab00c42ff	Handle index pulses on read.	2021-01-07 01:05:23 +01:00
David Given	a572742caa	I read my first disk using the GreaseWeazel!	2021-01-07 00:58:19 +01:00
David Given	400e5f8580	The bandwidth tester works.	2021-01-06 23:24:28 +01:00
David Given	74f0fd89b6	We can successfully seek on the GreaseWeazle.	2021-01-06 22:52:52 +01:00
David Given	09f9bea7a2	Add boilerplate for the GreaseWeazle driver.	2021-01-06 20:39:13 +01:00
Eric Anderson	d3a5bb08d3	Set drive before checking rotation speed for writing	2020-12-24 23:11:34 -08:00
Eric Anderson	f1506d0dbd	Add firmware support for hard sectors	2020-12-24 17:39:52 -08:00