1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/graphlcd-base/docs/DRIVER.gu256x64-372 Wed Feb 06 17:32:55 2008 +0000
1.3 @@ -0,0 +1,96 @@
1.4 +---------------------------------------------------------------------
1.5 +GraphLCD driver library
1.6 +
1.7 +The GU256X64-372 driver
1.8 +---------------------------------------------------------------------
1.9 +
1.10 +Description
1.11 +-----------
1.12 +The GU256X64-372 driver supports Noritake GU256x64-372 VFD displays.
1.13 +The VFD is operating in its 8 bit-mode connected to a PC's parallel
1.14 +port.
1.15 +
1.16 +
1.17 +Wiring
1.18 +------
1.19 +The GU256x64-372 driver supports the following connection on a parallel
1.20 +port:
1.21 +
1.22 + printerport LCD other
1.23 + ----------- ---------- ----------
1.24 + D0 (02) D0 (15) (Data Bit 0)
1.25 + D1 (03) D1 (13) (Data Bit 1)
1.26 + D2 (04) D2 (11) (Data Bit 2)
1.27 + D3 (05) D3 (09) (Data Bit 3)
1.28 + D4 (06) D4 (07) (Data Bit 4)
1.29 + D5 (07) D5 (05) (Data Bit 5)
1.30 + D6 (08) D6 (03) (Data Bit 6)
1.31 + D7 (09) D7 (01) (Data Bit 7)
1.32 + INIT (16) nWR (17) (Write)
1.33 + nSEL (17) R/S (19) (Register Select, C/D)
1.34 + GND (18) nRD (21) (Read)
1.35 + GND (18) CSS (23) (Chip Select)
1.36 + GND (18) GND (02) (Ground)
1.37 +
1.38 +
1.39 +Configuration Parameters
1.40 +------------------------
1.41 +The GU256x64-372 driver supports the following parameters in config
1.42 +file:
1.43 +
1.44 +Device
1.45 + Instead of using the direct output via port address (see Port), you
1.46 + can use the parport device (/dev/parportX). The advantage over the
1.47 + direct output via port address is that this works for non-root users
1.48 + also. But it's a little bit slower. The modules ppdev.o, parport.o
1.49 + and parport_pc.o must be loaded or compiled into the kernel.
1.50 +
1.51 +Port
1.52 + Sets the port address of the parallel port. If this parameter is not
1.53 + given, 0x378 is used. To use this direct output, the program that
1.54 + uses the driver library has to be started with user 'root'.
1.55 +
1.56 +Width
1.57 + Sets the horizontal size of the display. If this parameter is not
1.58 + given, a default value of 256 pixels is used.
1.59 +
1.60 +Height
1.61 + Sets the vertical size of the display. If this parameter is not
1.62 + given, a default value of 64 pixels is used.
1.63 +
1.64 +UpsideDown
1.65 + Rotates the display output by 180 degrees. This might be useful, if
1.66 + the LCD is mounted upside-down.
1.67 + Possible values: 'yes', 'no'
1.68 + Default value: 'no'
1.69 +
1.70 +Invert
1.71 + Inverts the display.
1.72 + Possible values: 'yes', 'no'
1.73 + Default value: 'no'
1.74 +
1.75 +Brightness
1.76 + Sets the brightness of your display's backlight.
1.77 + Possible values: 0 <= x <= 100)
1.78 + Default value: 100
1.79 +
1.80 +AdjustTiming
1.81 + To get a timing that is as accurate as possible, the drivers measure
1.82 + the time for port commands (see: benchmark in syslog). You might
1.83 + decrease or increase the time to wait after port commands with this
1.84 + parameter. Normally, there is no need to change this parameter.
1.85 + Possible values: -50 <= x <= 50
1.86 + Default value: 0
1.87 +
1.88 +RefreshDisplay
1.89 + Normally, most of the drivers do not update the whole display, but
1.90 + only the areas that have changed since last update. So it might be,
1.91 + that some faulty pixels would stay a longer time. To avoid this, the
1.92 + plugin makes a complete refresh from time to time. This parameter
1.93 + defines how often a complete refresh will be done.
1.94 + e.g.: A value of 5 means, that the plugin will make a complete
1.95 + refresh on every 5th update.
1.96 + A value of 0 completely disables complete refreshs.
1.97 + Possible values: 0 <= x <= 50
1.98 + Default value: 5
1.99 +