History of changes
library 'serdisplib' Revision History

2017-02-04: v 2.01 (supersedes both v1.97.x and v1.98.x)
- API-enhancements
  * new function serdisp_defaultdevice(displayname): returns default device identifier for given display name
    this function renders setting of device expressions unnecessary in most cases
    (testserdisp -n sdl -p out:  can now be simply entered as  testserdisp -n sdl)

- new displays / drivers / features:
  * SDC-Megtron USB-displays 240x128
  * output to an SDL window
  * Electronic Assembly EA KIT128-GXT (via serial port)
  * Omaura OLED (via serial port)
  * DG-16080 160x80
  * DG-16080-11 160x80 (non-square pixels)
  * displays driven by USB13700 USB module
  * Bolymin BL160128A colour OLED 18bit
  * 4DOLED-282815 colour OLED 18bit
  * Linux4Media L4M-2.8T320LCD USB LCD 320 Touch
  * Framebuffer device
  * GLCD2USB based device
  * experimental driver 'remote' (use configure-option --enable-experimental to enable)
  * support for mouse/touch events (SDL, L4M320T, framebuffer, displaylink)
  * added tool for generating touchscreen calibration info (framebuffer, displaylink)
  * added udev-rules file with rules for displays supported by serdisplib

- linking
  * option to compile library with libdl-support (libSDL, libusb, and libpthread are not linked to the library but loaded at runtime)
  * SONAME pattern matching added for maximum linux distribution compatibility (no more need for installed libusb-dev(el))
  * dynamic loading can be turned of with configure-option --disable-dynloading

* compiling
  * compile option added to only build library without any tools (--disable-tools)
  * support for RPi and RPi2 (Raspberry 1-3) including cross-compiling (via environment variable $PROJECT)

- drivers: enhancements / bug-removal
  * framebuffer: support for 'ugly' damage reporting (write '\n' to framebuffer device)

- deprecated:
  * driver displaylink is deprecated (use configure-option --enable-deprecated to reactivate it)

* bug fixes and much more (see SVN log for full history)

2011-03-20: parallel development of branches v1.98 and v1.97.x (since v1.97.2)
- workaround: serdisp_connect.h, struct serdisp_CONN_s {}
  * qt (moc) has problems with field signals[] (because of name-clash)
    -> workaround: field signals[] is wrapped into an #ifndef __cplusplus
    -> lcdbuilder (lcdbuilder.sf.net) should no longer have problems with this issue

- API-enhancements / bug-removals / library enhancements
  * new function serdisp_isdisplay(displayname): returns 1, if a certain display name is supported
  * new function serdisp_nextstaticoptiondesc(displayname, &optiondesc): 
    this function provides the same functionality as serdisp_nextoptiondescription() but the display is 
    identified by its textual name.
    the function may be used for retrieving the options provided by a display _without_ the need of a
    connected and initialised display (eg. for GUI-applications)
  * sdtools_generic_get/setpixel() were extended to be usable for depth = {1,2,4,8,12,16}
  * serdisp_control.c now also manages to allocate space for depth >= 8 if not set in driver (needed for remote)
  * macros sd_error() and sd_debug() are now wrapped in a block (thanks to maf for this hint)
  * serdisp_nextoptiondescription() didn't free resources -> fixed
  * graphlcd-plugin (vdr) should no longer crash if usb-based display is removed
  * serdisp_fullreset() now does reset in a more intelligent way
  * serdisp_connect_usb(): commit bug in IOW24-part of SDCONNusb_write() fixed
  * serdisp_tools.c: corrected bug in sdtools_strncpy() when force-setting string termination
  * all index()-occurences are replaced through strchr()
  * support added for pkgconfig
  * use doxygen for documentation of code and API
  * command processor added which is used in testserdisp.
    can also be used via telnet from 'outside' (if supported by specific driver)

- drivers: enhancements / bug-removal / new ones
  * n3510i: corrected problem with empty struct (initialising failed because of this issue)
  * n3510i: corrected update problem: now no more pixels should be missing when using usb
  * sed133x: improved clock-cycles from 4 to 3 steps
  * l4m320t: support added for 'digital devices usb lcd 320 touch' a.k.a l4m320t-displays (including support for touchpad)
  * l4m320t, l4m132c: added additional alias for 'alarmdays': 'alday'
  * l4m320t: support for new vendorID
  * l4m320t: added option 'alarmmode'
  * framebuffer: generic framebuffer support added (including different ways for damage reporting). linux only!
  * displaylink: generic displaylink device support added (via libdlo), but framebuffer-driver + udlfb
    should be used instead because development for libdlo seems to be dead and libdlo is not stable enough.

- tools:
  * l4m320t_tool: tool for l4m320t devices: firmware updates, change bootlogos, set alarms, calibrate touchscreen
  * l4m132c_tool: tool for l4m132c devices: change bootlogo, set alarms, set time, change contrast
  * sdcmegtron_tool: tool for sdcmegtron devices: change bootlogo, change brightness

- code-beautifying  
  * all driver-routines except serdisp_*_setup() are no longer visible outside the driver (seen at maf's code)
  * because of this, all serdisp_specific_*.h have been removed. all serdisp_*_setup() prototypes can now be 
    found in serdisp_control.h
  * removed code-duplication from serdisp_specific_sed153x.c  

- linking
  * libusb is no longer required at linking time. 
    for usb-support only the header files from libusb are required at compile time
  * all extra libraries like libpthread, libusb, ... are now loaded at runtime by dlopen() (libdl)
    -> when using linux all programs that statically link serdisplib are required to link to libdl

- introducing support for GPIs and GPOs
  GPIs: general purpose input (e.g.: touchpad events, IR-events, buttons)
  GPOs: general purpose output (e.g.: extra symbols, LEDs)

- client / server enhancements (only available if configure is called with --enable-experimental):
  * new display driver 'remote', contributed by maf
  * serdispd: server daemon, controls >= 1 displays, contributed by maf
    data is exchanged via internet using serdisplib driver 'remote'
  * lirc-support for c't-includ-display - contributed by maf
    serdisplearn, serdispproxy: generate lirc-compliants events (c't-include)

- all changes that were forgotten ...

HISTORY for parallel development of version 1.97.x since v1.97.2 and development branch of v1.98.x

2010-02-21: v 1.97.9   (= SVN r286)
- enhancements / bug-removal / changes
  * testserdisp.c:
    -> w/h info in test-pattern 'test' may now display up to 4 digits
    -> new test patterns for displaying gradients:
       'gradient': display four gradient bars (black to white / red / green / blue)
       'gradient R', 'gradient G', 'gradient B': red/green/blue gradient
       'gradient r', 'gradient g', 'gradient b': ditto, but different algorithm
  * new options:
    -> DSPAREAWIDTH, DSPAREAHEIGHT (both optional): user definable display area dimension 
       (used for calculating aspect ratio)
    -> BRIGHTNESS (values: 0 (dark) to 100 (full brightness))
       (for all displays/modules with support for 'CONTRAST')
  * output device:
    -> usb: additionally accept textual device names like "FTDI/DLP2232M" (additionally to "0x403/0x6010")
    -> usb: support for protocol differentiation (e.g.: USB@SPI) added.
            (better differentiation between 'connection types' and 'protocols' in code and messages,
             removed 'USBSPI' as connection type ('USB@SPI' now to be used instead))
  * serdisp_control.c:
    -> additionally accept hexadecimal values for options (if starting with 0x or 0X)
    -> support added for additional (optional) field 'mid_contrast':
       (to be able to use a power function based calculation of the contrast values)
  * serdisp_colour.c / serdisp_tools.c / serdisp_control.c:
    -> added functions, support, and enhancements for colour depths 18 (RGB666), 24, and 32
    -> bugfix for macro SD_CS_ISGREY()
  * serdisp_tools.c:
    -> support for calculating bounding boxes added (sdtools_calc_bbox())
    -> support for simple libm-independend replacements for log(), exp(), and pow()

- enhancements to ./configure and Makefiles
  * new option --enable-libSDL: enable driver 'directgfx' / SDL-output
  * cleaner linking (only link shared objects that are really required)
  * removed many bumps that caused problems with opensolaris and freebsd/pcbsd
  * many cleanups

- display driver bug-removal and enhancements
  * alphacool:
    -> usb initialisation problem (every 2nd start no output) solved
       (but a minor problem where de-initialisation may last some seconds remains)
  * n6100/s1d15g10:
    -> initialisation/resetting of scrolling commands added
  * l4m132c: added support for
    -> depth=1  (faster output)
    -> setting of fore/background colours (when using depth=1)
    -> resolution mode 128x64 (spare pixels are then used for visual IR signal confirmation)
    -> setting of alarm time (only if supported by firmware of module)

- new displays/controllers:
  * USB13700-module support
  * new driver 'directgfx' with support for SDL-output
  * LC7981-based displays (so far: DG-16080 series)
  * BL160128A added to ssdoled.c: Bolymin BL160128A colour OLED, 160x128, 18bit
  * 4DOLED282815 added to ssdoled.c: 4DOLED-282815 colour OLED, 128x128, 18bit

- new tools
  * l4m132c_tool (standalone tool for l4m132c modules):
    -> change bootlogo
    -> set alarm time / alarm days
    -> set module time
    -> change contrast/brightness
  * sdcmegtron_tool (standalone tool for sdcmegtron modules):
    -> change bootlogo
    -> save screenshot
    -> change brightness

- many cleanups and small bugfixes (eg: enforcing/fixing scope visibility limits)
  * see SVN revision log for detailed information

2008-07-31: v1.97.8
- enhancements / bug-removal / changes
  * testserdisp.c: changed starting point of moving box in pattern #6
  * bitbake file is now created automatically using PACKAGE_VERSION
  * serdisp_control.c: serdisp_clear() is now customisable by the driver
    (to be able to support 'clear' commands)
  * testserdisp.c: new test pattern 'gshade' (draws a grey level pattern)
  * testserdisp.c: new test pattern 'rgbtest' (draws a test pattern (RGB/CMYK) for colour displays)
  * testserdisp.c: pattern 'p 6' now draws coloured bars in the background on colour displays
  * testserdisp.c: commands 'sl' and 'sr' no longer crash on erraneous input
  * testserdisp.c: pattern 'p 0' now draws coloured digits on colour displays
  * serdisp_connect_usb.c: claiming of interface now immediately after usb_open()
  * added conversion functions for internal/external represenation of contrast and rotation value

- enhancements to ./configure
  * drivers are now (de)selectable using --with-drivers=driver1,driver2 or 
  * new option --enable-statictools  (default = yes)
    links testserdisp and multidisplay statically to libserdisp.a (if ==no: dynamically to libserdisp.so)

- display driver bug-removal and enhancements
  * nokcol driver:
    -> added 12bit colour modus for S1D15G10-based displays (wow, that was a pain in the a...)
    -> corrected incorrect setting of contrast for S1D15G10-based displays

  * FTDI support
    -> enhanced and enabled support for FTDI 2232 and 245 modules
       (for drivers supporting streaming and if the display/controller is connected to the parallel port)
    -> two modes are supported for now: SPI (8 and 9bit) and direct IO (up to 8 signal lines)

  * t6963 driver
    added new item 'scrbuf_bits_used' to struct 'serdisp_s'.
    'scrbuf_bits_used' replaces field 'fontwidth' which has been removed.

  * l4m driver
    added support for colour display modules 132x65
    interfaces are no longer hard-wired but now auto-detected

  * sed153x driver
    removed nasty typo (introduced in 1.97.5 and undiscovered since then) which rendered
    - Alps LSU7S1011A display modules and
    - Optrex 323 display modules
    unusable when connected using default wiring

  * sed133x driver
    initialisation rewritten
    - now bigger panels should work
    - dual panel displays are now supported (untested)
    support for s1d13700-based displays added

  * ks0108 driver
    inverted EN-signal when connected to parport -> improved signal quality (thanks to Alexey Martynov)

  * removal of code-redundancy
    -> drivers lh155, nokcol, sed133x, and t6963 now use generic set/getpixel_greyhoriz from serdisp_tools.c

- new displays/controllers:
  * goldelox support for displays that are driven by the GOLDELOX-MD1 module
  * stv8105 for Osram Pictiva OLED 256x64
  * Digital Devices 132x65 colour display module
  * S1D13700-based displays (added to sed133x-driver)
  * Ericsson T65 (pinout and controller compliant to Ericsson R520)

2007-10-08: v1.97.7  (= SVN rev.15)
- enhancements / bug-removal
  * serdisp_connect_usb.c:
    move interface-claiming part into separate function and do the claiming stuff not until the end 
    of SDCONNusb_open() - now alphacool usb-display works fine with solaris10 and init-problems seem
    to be fixed
  * serdisp_connect.h:
    small hack for c++-based projects: hide label of field 'signals' in struct serdisp_CONN_s
    (the library will/should always be compiled with gcc, so this hack shouldn't lead to any problems)
  * fixed erraneous pinouts in PINOUTS (S1D15G10-based displays and PCF8511)

- some preparations for re-merging 1.97.x-tree with devel-tree

- changes in bitbake file for openembedded linux
  * added do_stage()-section
  * minor changes

- display driver bug-removal and enhancements
  * ssdoled driver:
    -> fixed min/max-contrast settings for Osram Pictiva 128X64 OLED 4bit
  * nokcol driver:
    -> x/y startpos offset now variable through options OFFSETX and OFFSETY:
       Abhishek uses shiftx=0 and shifty=2; my displays use 1/1.
       so i made both offset settings variable (default: OFFSETX=1;OFFSETY=1)

- new displays/controllers:
  * linux4media L4M-5Ei usb-device (libusb and ioctl/hiddev)
    (cool usb-display with IR-sensor that connects as HID-device that is working out of the box when
     using linux)
  * alphacool 200x64 and 240x128 usb displays  (libusb)

2007-07-31: v1.97.6 (2nd driver backport release)
- fixed potential linking problem in src/Makefile (thanks to Bernhard Walle):
  libserdisp.so is now linked against libusb (if --enable-libusb is set)

- enhancements / bug-removal
  * serdisp_tools.c: corrected bug in sdtools_strncpy() when force-setting string termination
  * serdisp_tools.c: sdtools_generic_get/setpixel() now capable of depth = {1,2,4,8,12,16}
  * serdisp_tools.c: get/setpixel-routines for displays with horizontal bit-orders added
  * serdisp_colour.c: colour routines added, support for handling of self emitting displays (eg. OLEDs)
  * testserdisp.c: support for OLED-displays (inverse handling of default foreground/background colour)
  * testserdisp.c: 'test' now displays a colour/greyscale test image if applicable.
                   to force a black/white test image, 'bwtest' should be used
                   to force a greyscale or colour test image, 'ctest' should be used

- extended display support
  * nokcol driver:
    -> added support for S1D15G10-based displays (green connector, nokia 6100 and co. (130x130 colour displays)
       contributed by Abhishek Dutta
    -> driver now uses generic sdtools_generic_get/setpixel() functions
  * PCD8544 driver:
    -> added support for PCF8511-based displays (nokia 5310, 6310)
       contributed by Jeroen Domburg

- backported the following displays/controllers (from current devel version):
  * Osram Pictiva 96X36 OLED 1bit, 1", monochrome
  * Osram Pictiva 96X64 OLED 16bit, 1", colour
  * Osram Pictiva 128X64 OLED 4bit, 2.7", greyscale

- some countless minor changes / code beautifyings

2007-03-07: v1.97.5  (driver backport release)
- adapted some driver specs to current devel version 
  (following to this all serdisp_specific_*.h were now obsolete and have been removed)
- backported the following displays/controllers (from current devel version):
  * lh155-based displays (eg. Sharp M078CKA 240x64) - only 8080-mode supported for now
  * E08552 96x32 1bit (controller SED1530)
  * enhanced t6963-driver:
    -> includes support for parallel-to-serial converters found in some t6963c-based display modules
    -> support for switchable background light (RD-signal no longer available thus ready-check no longer available when
       using this mode!)
  * slightly fastened sed133x-driver: improved clock-cycles from 4 to 3 steps 

2007-02-22: v1.97.4  (very small interim error fix release)
- bug removal in ctinclud drawing routines
- bug removal in serdisp_messges.h: fixed missing bracketings in some defines
- bug removal in src/Makefile.in: LIB_NAME=libserdip -> LIB_NAME=serdisp (the former resulted in liblibserdisp.so... )
- serdisp.spec: dependency changed from libusb to libusb-devel
- version information in serdisp_control.h now generated using configure

2007-02-11: v1.97.3  (very small interim error fix release)
- bug removal in n3510i-driver 
  (descripted here: http://sourceforge.net/tracker/index.php?func=detail&aid=1522810&group_id=98249&atid=620440)
  allocating an empty struct caused n3510i to fail because of sdtools_malloc() returning 0

HISTORY until version v1.97.2

2006-04-02: v1.97.2  (interim problem solve release)
- bug(?)/problem removal
  * usb_bulk_read() causes some problems on certain linux-versions: replaced through usb_clear_halt()
    (usb_bulk_read() would be the right way to go, but it may cause big problems (no clue why...))

  * $(TARGET_LDFLAGS) included in Makefiles (for cross-compiling)

2006-03-27: v1.97

- bug removal
  * serdisp_connect.c: 
    section linux-includes: include sys/io.h only if directIO is supported 
    (otherwise useless or even leading to comp. errors) - thanks to Christoph Haderer for pointing this out
    bugs removed in SD_CS_IS_*:  | was used instead of &
  * serdisp_specific_sed133x.c:
    added an extra NOP at the end of the update-function to avoid erraneous pixels when releasing the parallel port

  * multidisplay
    corrected a bug resulting in a wrong background colour when in dithering mode (since v.1.96)

- enhancements
  * a SONAME is now set in libserdisp (enabled only when using linux)
  * additional functions SDCONN_writedelay() and SDCONN_commit() in serdisp_connect.c
  * serdisp_nokcol.c: set min/max_contrast borders to useful values for n3510i/n3530

  * serdisp_connect.c: new signal aliasnames: AD0-AD7, BD0-BD7 (BD4-BD7 for usb devices only)
  * serdisp_specific_ed156x.c: changes to enable generic backlight support
  * enhanced accuracy for serdisp_ARGB2GREY(): using (77*r + 150*g + 28*b) / 255 instead of (30*r + 59*g + 11*b) / 100.
    thanks to Michael Reinelt (maintainer of lcd4linux) for pointing this out

  * new connection type: SERDISPCONNTYPE_IOW24: for c't includ display using iowarrior kernel module by codemercs  
  * USB support via libusb (for now: IO Warrior 24 / c't includ display) - 
    disabled by default (see README for additional info)

- new displays supported
  * ericsson r520 displays (101x67, 4 grey levels, i2c. thanks to z01 from lcdinfo-forum for tracing the i2c-traffic)
  * ks0108-based displays (up to 4 controllers, > 2 controllers when using a multiplexer)
  * c't includ usb-display (ks0108/io warrior 24-based - www.includ.de)

- multidisplay
  * removed option -l (threshhold level) because it was useless anyways 
    (since some changes in the floyd steinberg algorithm)
  * new option -S (scaling algorithm)
  * animation support (new option -L <loops>)
  * graphlcd's .glcd-images supported (single and animated)
  * multiple image-file support for -f (note that -f should be the last parameter)
    if more than one image file is given for -f, a slideshow will be done by multidisplay
- architecture support
  * linux/mips successfully runs serdisplib. tested by Christoph Haderer (on his Asus WL-500G router).
    he also created a serdisplib package for openwrt (http://www.openwrt.org)

- limitations:
  * usb support (libusb) is not working with solaris and freebsd at the moment
    (solaris: unsolved problems with rights for interface 1)

- postponed to next release v1.98:
  * GPOs (general purpose objects), eg. symbols, leds, ... that are supported by certain displays
  * generic FTDI support 
    (it is working, but some things are still missing and the whole implementation is not tested very well. 
     so support for FTDI-chips has been disabled in this release)

2005-10-19: v1.96
- many internal changes (again and again):
  * replaced disp_code through disp_id. disp_id is no longer a unique code but a id used within a driver to differ 
    display types supported by the driver
  * removed all display codes (from now on distinguishing between displays using the display name or an alias name)
  * cleaned up source tree
  * enabled serdisplib for autoconf (not 100% perfect for now, but working quite fine - tested on linux and solaris)
  * removed PPEXCL when connecting to the parallel port because that caused problems with lp-based programs connected 
    to another parallel port (thanks to Michael Reinelt)
  * replaced dd->curr_reverse / dd->feature_reverse / FEATURE_REVERSE through 
    dd->curr_invert / dd->feature_invert / FEATURE_INVERT to avoid two names for the same thing 
    (to guarantee backward compatibility: FEATURE_REVERSE is now a define to FEATURE_INVERT)
  * serdisp_reset() rewritten. now this function only does a display reset (device reset broke this function sometimes).
    to do a full reset of device and display use:
  * serdisp_fullreset(): does a full reset of the device, display, and contrast. 
    if resetting was successful a new display descriptor is returned.

- deprecated functions / routines:
  * serdisp_feature() is now deprecated (superseded by serdisp_setopion())
- new functions / routines:
  * serdisp_getoption(), serdisp_setoption(), serdisp_isoption(), 
    serdisp_getoptiondescription(), serdisp_nextoptiondescription() .. get/set/query options
  * serdisp_getdisplayname(), serdisp_isdisplay(), serdisp_getdisplaydescription(),
    serdisp_nextdisplaydescription(), serdisp_currdisplaydescription() .. query display informations / settings
  * serdisp_transcolour(), serdisp_transgrey(),    .. hardware independend colour info to hw dependend format
    serdisp_lookupcolour(), serdisp_lookupgrey()   .. hardware dependend colour info to independend format

- new defines / macros:
  * sd_getdebuglevel(), sd_setdebuglevel()  .. get/set the debug level
  * sd_setlogmedium()  .. set the medium where to output debugging information

- new display category: colour displays

- new displays supported: 
  * nokia 3510i / 3530 colour displays (98x67, 256 or 4096 colours)
  * lph7508 displays (100x64 monochrome; using display module kit by pollin)
  * Hyundai HP12542R displays (128x64 monochrome; using display module kit by pollin) - thanks to cypher_head, I30R6

- testserdisp and multidisplay
  * version information (new option -V)
  * extended help showing supported displays and display information
  * testserdisp now only shows interactive commands that are supported by the active display when entering 'help'
  * testserdisp: new interactive commands 'i' / 'info' and 'fg'  (enter 'help' for more information)
  * multidisplay: fixed bug in option -B (backlight on/off)

- .spec file included for generating RPMs for RedHat/Fedora-based distributions (see README for further informations)

2005-05-10: v1.95
- bug removal:
  * setpixels()
    erraneous loop-calculations corrected (reported by anonymous person at sourceforge bug forum)
  * strncpy-calls replaced through sdtools_strncpy using a workaorund to avoid strncpy-bugs
    strlcpy is used on solaris to avoid strange behaviour of strncpy when n < 4
    there also seems to be a problem on linux with strncpy ...
  * corrected a bug in serdisp_blink() - now all displays should be able to blink (by inverting the screen)

- many internal changes
  * dd now stores colour depth instead of amount of colours
  * restricted colour depth to a maximum of 8 (may be extended in the future. 
    at the moment, only colour depth 1 is used anyways)
  * logical to physical x/y positions are calculated using relocation tables; thus the following was possible:
    - driver specific get/setpixel functions were replaced through generic set/getpixel functions
    - optrex 323 support is now accomplished by sed1530 driver 
      (sed1530 and sed1531 (used by optrex 323) are using the same command set and protocol)
      new name of module: serdisp_specific_sed153x.c|h
  * memset instead of loops for serdisp_clearbuffer() and serdisp_rewrite()
  * many unlisted internal enhancements and code-beautifyings
  * setpixel()/getpixel(): type change
    parameter 'colour' changed from int to long, getpixel returns now long instead of int
    (recompilation the whole stuff should do it. on 32-bit machines, int and long are both 4 byte)
    background: long is always 4 bytes, int is not (16-bit architectures: 2 byte, 32-bit: 4 byte)

- 90 and 270 degree rotations added
  * now displays may be rotated 0, 90, 180, and 270 degrees
    eg: a 96x65 display may be used as a 65x96 display if rotated 90 or 270 degrees 

    NOTA BENE: dd->height and dd->width will always return unrotated height and width, 
               use serdisp_getwidth(dd) and serdisp_getheight(dd) to get width and heigth when display is rotated.

- customisable wirings and options (key-value pairs separated by semi-colons)
  * serdisp_init() now understands key-value pairs which may contain options (eg. INVERT=YES) and wiring definitions
  * enhanced serdisp_connect.c which now also supports parallel displays and reading from the parallel port
    (thanks to Andreas 'powARman' Regel for helping me find and eliminate mistakes)
  * renamed serdisp_conntype_s.conncode to serdisp_conntype_s.conntype 
    (defines now are called "CONNTYPE" and not longer "CONNCODE")

- new methods for serdisp_control
  * serdisp_getpixelaspect()
    get pixel aspect ratio (useful for displays with non-quadratic pixels)
  * serdisp_getdepth()
    get colour depth
  * serdisp_getversioncode()
    get version code of serdisplib
- testserdisp
  * time measuring (ts=1) 
  * setpixel()/getpixel() replaced through more generic setcolour()/getcolour

- new displays supported: (serdisplib goes parallel!)
  * Toshiba TLX-1391 (128x128)
  * generic T6963-display support (default resolution: 240x128)
    (thanks to Andreas 'powARman' Regel for testing generic support using his 240x128 display)
  * SED 1330/1335-based displays
  * nec 21a ("skyper") display module support (sed1561)
  * lph7690 display (look at 'pcd8544 driver enhancements' below)

- operating systems and compiler support:
  * support added for solaris 10 (ecpp only). tested on solaris 10 x86
  * support for *BSD suspended due to lack of interest (will be resumed if someone finally tests it)
  * tested with gcc 2.96, gcc 3.x, and gcc 4.0
  * pointer operations are all 64-bit aware
- pcd8544 driver enhancements (driver now supports pcd8544 and compliant command sets):
  * unused signal CS removed (circuits, descriptions, ... have been adapted, too)
  * added support for lph7690-displays (found in nokia 6210/6310 and others). resolution: 96x60
- new tool 'multidisplay'
  * displays pictures (jpg, png for the moment) 
    auto-scaling and auto-pixel aspect ratio correction
  * displays messages or files
  * displays variable command output
  * picture may be set as background for text output
  * libgd used for picture processing and generating text-output
    -> 5 built-in fonts
    -> support for truetype fonts

2004-07-22: v1.94

- new display supported: 
  * ALPS LSU7S1011A, controller SED1530  (sold by pollin.de)

- start with some internal aggregation and enhancements

2004-07-18: v1.93

- serdisplib: version info:
    major and minor version number of currently installed serdisplib
  * SERDISP_VERSION_CODE: version code of currently installed serdisplib


- serdisplib: beautifying:
  * code beautifying and removing warnings in all modules

  * replaced fprintf()-messages through sd_debug() and sd_error() which use syslog()
    sd_error() also sets an error string (sd_errmsg) which can be used for own error messages

  * sd_runtime_error() returns whether a runtime error occured (eg: ioctl-commands where unsuccessful)

- new display type supported: i2c-displays
  * ericsson t2x displays (eg: t28)  (101x33 pixels)

- new output device supported:
  * serial port (only for i2c-displays),
    either ioctl (eg: /dev/ttyS0) or direct-IO (eg: 0x3f8)

- serdisp_control: new / changed functions:
  * serdisp_getSDCONN(): get serdisp connect descriptor
  * serdisp_reset(): resets display (resets sd_runtime_error() and tries to re-init output device)
  * serdisp_quit(): release output device and close display
  * serdisp_close(): release output device but do NOT clear and close display
                     (this may be used for example for programs that display a message and quit)

                     ATTENTION: this does NOT work with serial port in combination with ioctl!
                                (serial port in combination with direcct-IO works as expected)

- serdisp_control: new elements in display descriptor
  * delay:  how many nanoseconds to delay after each write-operation
  * connection_types: which connection types (parport, serport, ..) are supported by display  

- serdisp_specific_*.c
  * corrected bug in serdisp_feature(): FEATURE_ROTATE now works as expected

- changes to api: 
  * in the future, more output devices will be supported
    (besides parport and since this release serport for i2c)
    thus serdisp_parport.h, PP_open, PP_close and PP_write where replaced through
    serdisp_connect.h, SDCONN_open, SDCONN_close and SDCONN_write.
    also the descriptor serdisp_PP_t was renamed to serdisp_CONN_t

    for backward compatibility serdisp_parport.h is still existing and contains defines
    that resemble the old names (but it is recommended to only use serdisp_connect.h)

    no display descriptor fields should be accessed directly. so ONLY serdisp_close() or
    serdisp_quit() should be used for shutting down the output device (no more SDCONN_close(dd->sdcd);)

  * SDCONN_read will be used for reading data from the output device (eg: i2c acknowledge bit)

- testserdisp
  * better/corrected error messages, printing of usage
  * some cleaning up
  * additional parameters (type 'help' at the prompt)
  * test picture is now generated, no more *.xbm are needed
  * test picture now displayed after starting testserdisp
  * some more/changed/better test patterns

- serdisp_specific_optrex323.c
  * #define OPT_MRPROPER no longer activated -> speedup (in some cases enormous speedup)
    (if you face faulty pixels at the two unused borders, please reactivate)

- Makefile
  * mkdir -p now used for recursively creating $(DRIVERINCLUDE_PATH)/serdisplib
    (thanks to Alan Carvalho for this hint)

- serdisplib now compiles under the following operating systems:
  * linux   (compiles and tested with kernel 2.4.x and 2.6.x)

  * freebsd (compiles, but not tested; only ioctl for now)
  * openbsd (compiles, but not tested; only ioctl for now)
  * netbsd  (should compile, could not verify)

2004-03-22: v1.92
- changed version numbering back from beta to number format
- removed common history information from source file
  history information can now be found here
- new: serdisp_tools. will contain handy functions
    sdtools_genericrotate ... (unoptimised) rotation of display
                              will be unoptimised because it will be nearly
                              never used anyway
- changes to api: 
  * now both, direct outp and ioctl-calls are supported for writing to the 
    instead of a filedesc ('int fd') a struct 'ppd' (parport descriptor)
    is now used
    (thus changed: PP_open, PP_close, PP_write, serdisp_init)

  * additional parameter for serdisp_init:  char extra[]
    can be (char*)0, "" or additional settings (future use)
    may contain settings like non-standard wiring, non standard dimensions, ...

- now more than 8 pages are supported for monochrome displays

- functions added:
    serdisp_getpixel      ... gets colour at position (x/y)
- version information added to serdisp_control.h

- two new fields in dd-struct:  startxcol and startycol (needed for example by nokia 7110)

- new display/controller supported: nokia 7110 (or generic: controller sed1565)
  "NOKIA7110" (96x65 nokia 7110 display)
  "SED1565"   (132x65 generic. don't use this with nokia7110, use string above)

- enhanced makefile
  now both, static and shared library are built when 'make install'
  include-files are now installed, too

- corrected minor bugs (typos, misleading comments, ... )

2004-02-04: v1.9b1
- corrected some typos
- tarball now unpacks into separate directory

2004-02-03: v1.9b: first release to the public

2004/Jan    rewrite again. be more modular and generic
            html-pages for serdisplib went into production (hardware, ...)

2003/Dec    rewrite  (support for new display class: += pcd8544-based ones)

2003/July   start of library (only display: optrex 323)
            library is used only as sub-system for graphlcd for now

former version were experimental w/o useful Makefile 
and stuff like that (first functioning version: ~ july 2003)