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** Greaseweazle Release Notes
** Keir Fraser <keir.xen@gmail.com>
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** v0.22 - 27 November 2020
 - Support read and write of Amiga ADF image files
 - Increase /STEP pulse width to 15us (fix 5.25" drive seek for Arno Olaf)
 - Flippy drives: support 'gw seek' down to track -8
 - Revised USB protocol

** v0.21 - 10 September 2020
 - Support new Greaseweazle model: F7 Lightning Plus
 - Fixes for older drives
   - 50us index mask, avoid double triggering on the index signal
   - Increase default head-step delay to 5ms
 - Windows: Install the CAPS/SPS IPF library automatically
 - New command 'gw seek' to seek to specified drive cylinder
 - New syntax for specifying Greaseweazle device name on command line
   - eg 'gw read --device COM3 a.scp'

** v0.20 - 1 July 2020
 - gw write: New options --erase-empty and --double-step
 - gw update: Fix COM redetect on Windows running Bitdefender
 - Support version 2 of Ant Goffart's F7 Plus
 - SCP: support legacy single-sided SCP images
   - Automatic import; Export via ::legacy_ss suffix
     - eg. gw read --single-sided my.scp::legacy_ss
 - SCP: support SCP image files generated by FluxEngine

** v0.19 - 8 June 2020
 - F7 v2: Support for the new board design
 - gw update: Signature and CRC validation checks
 - gw read: Fix end-track field in single-sided SCP images

** v0.18 - 28 May 2020
 - gw read: New parameters --rate and --rpm
   - rate: Bitcell data rate in kbit/s (eg 250=DD 500=HD)
     - Used only for HFE images right now, where default is DD (250)
   - rpm: Normalise track timings to the given RPM value
     - This occurs before any other conversion or analysis
 - gw info: New command to display information about the Greaseweazle setup
 - gw bandwidth: Improved stats output
 - SCP: Fix single-sided image handling according to latest SCP spec.
   - Operates correctly with latest beta version of HxC software
 - F7: Support new board designs
   - AmberTronic F7 Plus: Kryoflux form factor, output buffers, 12v supply
   - F7 Lightning: High Speed USB, output buffers

** v0.17 - 19 May 2020
 - Windows: New self-contained executable distribution
   - No need to install Python, or module dependencies
 - Mac, Linux: Main script is directly executable
   - No need to manually invoke the Python interpreter
 - GW host tool: Help-text description for each available action

** v0.16 - 15 May 2020
 - F7 Firmware: Enable over-drive voltage mode
   - Required for reliable 216MHz operation (see datasheet)
 - Bootloader update:
   - 'gw.py update --bootloader' updates the bootloader
   - Not normally required
   - Failure may brick the Weazle and require full reflash: Take care!
 - Update build system to work with Windows MinGW environment

** v0.15 - 5 May 2020
 - Host tool improvements:
   - IPF: More robust conversion to raw flux for writeout
   - HFE: Fix crash when writing out HFE from third party tools
   - F7 Firmware improvements:
     - Preparation for High Speed USB (future board using 730Z8 MCU)
     - Enable Instruction and Data caches (10x execution speedup)
     - Various improvements to bandwidth as reported by 'gw.py bandwidth'
     
** v0.14 - 29 April 2020
 - IPF: Full write support (weak data, index misalignment)
 - New GW commands: bandwidth, erase
   - bandwidth: Measure USB read/write bandwidth
   - erase: Erase a disk
 - F7 USB: Improved bandwidth when writing to disk
   - Much less likely to see FluxUnderflow failures
 - update: Fix a bug which could fail to reopen the GW device for update
 - update: Automatically find the update file if filename not specified
 - Control script: Tidier notification of errors (no scary backtrace)

** v0.13 - 25 April 2020
 - HFE: Read & write support
 - IPF: Preliminary write support
   - Requires SPS/CAPS support library. See the wiki.
   - Weak data not yet supported (RNC "Protect Process" protection, & others)
   - Write splice is always rotated to the index (affects Speedlock & others)
   - Also TODO: Verified writes
 - USB: Use the VID:PID pair assigned to Greaseweazle (1201:4d69)
 - New prerequisite: 'bitarray' module. See the wiki.

** v0.12 - 10 March 2020
 - GW Autodetect: General improvements, and now works on Windows 7
 - New read parameter --double-step to double-step drive heads
   - Useful for reading a 40-cylinder disk in an 80-cylinder drive
 - New 'pin' command allows a floppy pin to be set to specified level
   - Currently supported only for pin 2 (DENSEL)
 - New 'reset' command resets the Greaseweazle to power-on settings
   - Motors off, drives deselected, power-on pin levels and delay values

** v0.11 - 21 January 2020
 - GW.py: Auto-detect the COM/serial port device name
   - The device argument is now optional!
 - USB: Provide a serial-id string to the host
   - Identifier is unique to each Greaseweazle device
   - Allows disambiguation between multiple Greaseweazle devices
   - Recommended: Full flash from HEX file (embeds serial in bootloader)
 - Ubuntu: Udev script now creates a /dev/greaseweazle symlink

** v0.10 - 17 January 2020
 - STM32F7xx: Multi-drive support via drive-select config option
   - Up to three Shugart drives or two IBM/PC drives
   - gw.py read|write --drive {a,b,0,1,2}
   - See the "Drive Select" wiki page

** v0.9 - 7 January 2020
 - Activity LED
   - Lights while a USB-issued command is in progress
   - Flashes when enumerated but idle in the firmware-update bootloader

** v0.8 - 6 January 2020
 - STM32F73xx: Various Fixes and Improvements
   - Allow Firmware Update mode to be forced via strapping Serial RX/TX
   - Fix bogus sample values at start of read flux values
   - Fix some time constants to be in units of the sample clock
 - USB: Advertise USB 2.0 device descriptor

** v0.7 - 6 December 2019
 - USB: Fix end-of-stream detection on track writes
   - Writes of empty/unformatted tracks sometimes hung forever
 - No Flux Area: Firmware automatically masters long NFAs during track writes
   - Generating no flux transitions does not read back as a NFA
 - STM32F73xx: Initial support for new STM32 MCU
   - Two HEX files are included: Use Greaseweazle-F1-* for existing boards!
   - Single unified UPD file containing both firmware images

** v0.6 - 15 November 2019
 - gw.py: Big overhaul of underlying Python package
   - Action (read, write, update) must come first on the command line
   - eg. "python3 gw.py read --ecyl=39 foo.scp COM3"
 - gw.py: New action "delays" to print/set delay parameters
   - eg. "python3 gw.py delays --step=10000" to increase step time to 10ms

** v0.5 - 11 November 2019
 - USB: Overhaul the protocol and allow writes to be terminated at index
   - Terminate-at-index is always used by current Python control script
   - Terminate-at-index prevents an over-long write from overwriting itself
   - Fix interruption of track writes (eg. KeyboardInterrupt)
 - gw.py: New option --adjust-speed to normalise flux times for target drive
   - Measures RPM of the target drive and calculates an adjustment factor

** v0.4 - 5 November 2019
 - Blinky: Diagnostic test firmware to detect fake STM32 chips
   - https://github.com/keirf/Greaseweazle/wiki/STM32-Fakes
 - Floppy Write: Fix for very short flux timings
 - Floppy Read: Fix for very long flux timings
 - USB: Small improvement to double-buffer logic

** v0.3 - 30 October 2019
 - Bootloader: Fix Programming-Jumper detection
 - Read Track: Various minor fixes
 - SCP: Fix the SCP file headers generated by "gw.py read"
 ** IMPORTANT USER INSTRUCTIONS **:
 - Users must serial-update using the v0.3 HEX file
   - DO NOT update from v0.2 using the UPD file
 - May need to install the crcmod package: eg "pip3 install crcmod"

** v0.2 - 29 October 2019
 - USB: Fix hangs during "gw.py read"
   - Thanks to Charlie Smurthwaite for telling me how to fix this!
 - USB: Improved bandwidth (double-buffered IN/OUT endpoints)
   - Reduces risk of buffer underflow/overflow during disk operations
 - Firmware Update: Requires a jumper across A14 (aka DCL) and GND
   - eg. "python gw.py update Greaseweazle-v0.2.upd COM3"

** v0.1 - 17 October 2019
 - First release