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---------------------------------------------------------------------
GraphLCD driver library
The GU126X64-K610A4 driver
---------------------------------------------------------------------
Description
-----------
The GU126X64-K610A4 driver supports Noritake GU126X64D-K610A4 VFD
display.
The VFD is connected to a single PC parallel port.
Wirings
-------
The GU126X64-K610A4 driver supports the following connections on a
parallel port:
printerport LCD other
----------- ---------------- -------
5V (Con1.1) VCC (Power supply 5V)
ACK (10) MB (Con1.9) (Module Busy)
0V (Con1.5) GND (Ground)
GND (18) 0V (Con2.1) (Ground)
INIT (16) ENABLE (Con2.2) (ENABLE)
D0 (02) PA0 (Con2.3) (DataBit 0)
D1 (03) PA1 (Con2.4) (DataBit 1)
D2 (04) PA2 (Con2.5) (DataBit 2)
D3 (05) PA3 (Con2.6) (DataBit 3)
D4 (06) PA4 (Con2.7) (DataBit 4)
D5 (07) PA5 (Con2.8) (DataBit 5)
D6 (08) PA6 (Con2.9) (DataBit 6)
D7 (09) PA7 (Con2.10) (DataBit 7)
The Display is configured to parallel port mode with "Clock Input"
to "Falling Edge".
================================================================
Configuration Parameters
------------------------
The GU126X64-K610A4 driver supports the following parameters in
config file:
Device
Instead of using the direct output via port address (see Port), you
can use the parport device (/dev/parportX). The advantage over the
direct output via port address is that this works for non-root users
also. But it's a little bit slower. The modules ppdev.o, parport.o
and parport_pc.o must be loaded or compiled into the kernel.
Port
Sets the port address of the parallel port. If this parameter is not
given, 0x378 is used. To use this direct output, the program that
uses the driver library has to be started with user 'root'.
Width
Sets the horizontal size of the display. If this parameter is not
given, a default value of 256 pixels is used.
Height
Sets the vertical size of the display. If this parameter is not
given, a default value of 64 pixels is used.
UpsideDown
Rotates the display output by 180 degrees. This might be useful, if
the LCD is mounted upside-down.
Possible values: 'yes', 'no'
Default value: 'no'
Invert
Inverts the display.
Possible values: 'yes', 'no'
Default value: 'no'
Brightness
Sets the brightness of your display's backlight.
Possible values: 0 <= x <= 100)
Default value: 100
AdjustTiming
To get a timing that is as accurate as possible, the drivers measure
the time for port commands (see: benchmark in syslog). You might
decrease or increase the time to wait after port commands with this
parameter. Normally, there is no need to change this parameter.
Possible values: -50 <= x <= 50
Default value: 0
RefreshDisplay
Normally, most of the drivers do not update the whole display, but
only the areas that have changed since last update. So it might be,
that some faulty pixels would stay a longer time. To avoid this, the
plugin makes a complete refresh from time to time. This parameter
defines how often a complete refresh will be done.
e.g.: A value of 5 means, that the plugin will make a complete
refresh on every 5th update.
A value of 0 completely disables complete refreshs.
Possible values: 0 <= x <= 50
Default value: 0
Debug
Prints debugging information of some methods of the driver.
(add the values of interest)
1: show a log at the start of a refresh
2: show a log at the end of a refresh with timing information
4: show the rows (8 pixel) refreshed
8: show every commands/bytes sent to the display
16: log every unsuccessful waiting for display acknowledge
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